p wave and s wave from seismograph Seismic waves are wave s of energy that travel through the earth ... referred to as Ambient Vibrations ambient vibrations . Seismic waves are studied by seismology seismologists and geophysics geophysicists . Seismicwave fields are measured by a seismograph , geophone ... structures. Types of seismic waves There are two types of seismic waves, body wave and surface waves . Other modes of wave propagation exist than those described in this article, but they are of comparatively ..., long duration, and large amplitude, they can be the most destructive type of seismicwave. There are two types of surface waves Rayleigh wave s and Love wave s. Rayleigh waves Main Rayleigh wave Rayleigh ... from a location to the origin of a seismicwave less than 200 km away is to take the difference ... links http www.kuleuven.be bwm edt EDT A MATLAB toolbox for seismicwave propagation http www.eas.purdue.edu ... DEFAULTSORT SeismicWave Category Seismology and earthquake terminology ar bn ... om Seismicwave pl Fala sejsmiczna pt Onda s smica ru sk Seizmick vlna sr ... velocities when reaching seismic observatories, their different Propagation speed travel time enables the scientists to locate the epicenter . In geophysics the refraction or reflection of seismic ..., and phase. This effect is similar to the refraction of light wave s. P waves Main P wave P waves primary waves are compressional waves that are longitudinal wave longitudinal in nature. P waves are pressure ..., 1450 m s in water and about 5000 m s in granite . S waves Main S wave S waves secondary waves are shear waves that are transverse wave transverse in nature. These waves typically follows P waves ... on the propagational direction, the wave can take on different surface characteristics for example ... given material. Surface waves Main Surface wave Surface waves are analogous to water waves and travel ... at shallow depths is retrograde, and that the restoring force in Rayleigh and in other seismic waves ... more details
main Earthquake engineering Seismic loading is one of the basic concepts of earthquake engineering which means application of an earthquake generated agitation ref name ReadingStrongMotion cite book title Reading and Interpreting Strong Motion Accelerograms author Hudson, D.E. date 1979 publisher EERI isbn 7953973 ref to a structure . It happens at contact surfaces of a structure either with the ground ref http earthquake.geoengineer.org The Geotechnical Earthquake Engineering Portal ref , or with adjacent structures ref http earthquake.geoengineer.org Seismic Pounding between Adjacent Building Structures ref , or with gravity wave s from tsunami . Seismic loading depends, primarily, on Anticipated earthquake s parameters at the site known as seismic hazard Geotechnical parameters of the site Structure s parameters Characteristics of the anticipated gravity wave s from tsunami if applicable . Sometimes, seismic load exceeds ability of a structure to resist it without being broken, partially or completely. Due to their mutual interaction, seismic loading and seismic performance of a structure are intimately related. See also Earthquake engineering structures References reflist 2 Category Earthquake and seismic risk mitigation Category Earthquake engineering es Carga s smica ru simple Seismic load ... more details
Image Earthquake wave shadow zone.svg thumb 150px Seismic shadow zone from USGS Seismic shadowing is a global effect of an earthquake . The seismicwave s generated by an earthquake pass through Earth , but between 104 and 140 from the hypocenter focus of an earthquake, little or no seismic waves can be detected. This is because P wave primary waves P waves are refracted by the Planetary core Earth s core and S wave secondary waves S waves are stopped by the core. When an earthquake occurs, seismic waves radiate out spherically from the earthquake s focus. When the waves reach the Earth s surface, a seismograph can detect the movement of the rock. The velocity of the waves is dependent on the density of the rock that the waves pass through. The density changes abruptly at the boundary between the Earth s solid Mantle geology mantle and liquid core, causing the P wave wavefront to change direction and the S waves to stop entirely. P waves are refracted by the Earth s core, but can still travel through the core to the other side of the Earth. The P wave shadow zone extends from 104 away from the focus, to 140 . S waves are unable to pass through the Earth s core because it is a liquid. Therefore, the S wave shadow zone covers the entire section of the Earth beyond 104 . See also Ray tracing physics Category Seismology and earthquake terminology tectonics stub ... more details
File Refracted wave.png thumb Propagating seismic waves bottom and related travel time diagram top of the direct blue and the first refracted phase green Seismic refraction is a geophysical principle see refraction governed by Snell s Law . Used in the fields of engineering geology , geotechnical engineering and exploration geophysics , seismic refraction traverse s seismic lines are performed using a seismograph s and or geophone s , in an array and an energy source. The seismic refraction method utilizes the refraction of seismic waves on geologic layers and rock soil units in order to characterize the subsurface geologic conditions and Structural geology geologic structure . The methods depend on the fact that seismic waves have differing velocities in different types of soil or rock in addition, the waves are refracted when they cross the boundary between different types or conditions ..., or to bedrock , to be determined. P Wave Refraction aka Compression Wave Refraction P wave refraction evaluates the compression wave generated by the seismic source located at a known distance from the array. The wave is generated by vertically striking a striker plate with a sledgehammer, shooting a seismic shotgun into the ground, or detonating an explosive charge in the ground. Since the compression wave is the fastest of the body waves seismic waves , it is sometimes referred to as the primary wave and is usually more readily identifiable within the seismic recording as compared to the other seismic waves. S Wave Refraction aka Shear Wave Refraction S wave refraction evaluates the shear wave generated by the seismic source located at a known distance from the array. The wave is generated by horizontally striking an object on the ground surface to induce the shear wave. Since the shear wave is the second fastest wave, it is sometimes referred to as the secondary wave . When compared to the compression wave, the shear wave is approximately one half but may vary significantly ... more details
Seismic tomography is a methodology for estimating the Earth s properties. In the seismology community, seismic tomography is just a part of seismic imaging , and usually has a more specific purpose to estimate properties such as propagating velocities of compressional waves P wave and shear waves S wave . It can also be used to recover the attenuation factor Q. Another branch of seismic imaging is seismic migration in which the properties to be estimated include the reflection coefficient or reflectivity. In another way, we define tomography as a technique whereby a 3 dimensional images are derived from the processing of integrated properties of the medium that rays encounter along their paths through it. Seismic tomography refers to the derivation of the 3 dimensional velocity structure of earth from seismic waves. The simplest case of seismic tomography is to estimate P wave velocity. Several ... frequency traveltime tomography, reflection traveltime tomography, waveform tomography. Seismic tomography ... to the time of the wave onset and instead measure travel times or amplitudes over a time window of some length using cross correlation. Finite frequency tomography takes the effects of wave diffraction ... uses waveform tomography. In this case, the seismograms are the observed data. In seismic exploration, the forward model is usually governed by the acoustic wave equation. This is an approximation to the elastic wave propagation. Elastic waveform tomography is much more difficult than acoustic waveform tomography. The acoustic wave equation is numerically solved by some numerical schemes such as finite difference and finite element methods. Seismic waveform tomography can be efficiently solved by adjoint methods. References Stewart, R. R., Exploration Seismic Tomography Fundamentals , Society of Exploration Geophysicists, 1991 Nolet, G., A Breviary of Seismic Tomography , Cambridge University Press, 2008 Tarantola, A., Inversion of seismic reflection data in the acoustic approximation ... more details
10.1063 1.3068491 ref As of 2009 seismic metamaterials were still in the development stage. ref name seismic cloak ref name seismic cloak 2 The mechanics of seismic waves see also Seismicwave Elastic wave Hooke s law More than a million earthquakes are recorded each year, by a worldwide system of earthquake detection stations. The propagation velocity of the seismic waves depends on density and elasticity physics elasticity of the earthen materials. In other words, the speeds of the seismic waves vary as they travel through different materials in the earth . The two main components of a seismic event are Seismicwave Body waves body waves and Seismicwave Surface waves surface waves . Both of these have different modes of wave propagation. ref name seismic waves cite book last Krebs first ... of structures from seismicwave s are then applied to waves of force that travel through the Earth .... One of the effects of the metamaterial is to de couple these components of the seismicwave. By applying ...Continuum mechanics Seismic metamaterials , are metamaterial s which are designed to counteract the adverse effects of seismic waves on artificial structures, which exist on or near the surface of the earth. ref name seismic cloak ref name seismic cloak 2 ref name control elastic waves cite journal last ... isbn 9780313319303 ref Dissipating ocean surface waves with seismic metamaterials Computations showed that seismic waves traveling toward a building , could be directed around the building, leaving the building unscathed, by using seismic metamaterials . The very long wavelength s of earthquake waves ... so as to arrive in phase as the earthquake wave proceeded, as if the building was not there. The mathematical ..., or hole, and protecting buildings from seismic waves employs this same principle. ref name seismic cloak ref name seismic cloak 2 Giant polymer made split ring resonator s combined with other metamaterials are designed to couple at the seismic wavelength . Concentric layers of this material would ... more details
Cleanup date December 2007 Refimprove date July 2007 This article is about artificial seismic sources. For natural seismic sources, see Earthquake , Volcano , and related articles. Image Air gun hg.jpg thumb An air gun seismic source 30 litre A seismic source is a device that generates controlled seismic energy used to perform both reflection seismology reflection and seismic refraction refraction seismic surveys. A seismic source can be simple, such as dynamite , or it can use more sophisticated technology, such as a specialized air gun . Seismic sources can provide single pulses or continuous sweeps of energy that generate seismicwave s, which travel through a Medium optics medium such as water ... SeismicWave Propagation Modeling and Inversion, Phil Bording ref Types of sources Explosives Explosives , such as dynamite , can be used as crude but effective sources of seismic energy. Generally .... SeismicWave Propagation Modeling and Inversion, Phil Bording http www.ipp.mpg.de de for bereiche stellarator Comp sci CompScience csep csep1.phy.ornl.gov sw sw.html Derivation of Seismicwave ... refract and is recorded by receivers, such as geophone s or hydrophone s. Seismic sources may be used ... to yield comprehensible data about the subsurface. Source model A seismic source signal has the following ... in a hole that is drilled with dedicated drilling equipment for this purpose. This type of seismic ... being to create the optimum initial shock wave with minimum reverberation of the bubble after the first ... to provide the seismic source. A heavy weight is raised by a hoist at the back of the truck and dropped ... nearby places in an array whose dimensions may be chosen to enhance the seismic signal by spatial ..., though a heavily thumped seismic line with transverse ridges every few metres might create long lasting ... in politically unstable areas, was that no explosives were required. Seismic vibrator A Seismic vibrator ... sources Boomer sound sources are used for shallow water seismic surveys, mostly for engineering survey ... more details
volume. Passive seismic usually focuses on a low frequency signals 0 to 10 Hz and is sometimes ... very close together and relatively short frequently minutes only . The passive seismic ... ref Blue D, Meskauskas A 2009 . Using low frequency seismic. Digital Energy Journal http www.digitalenergyjournal.com ... Package Passive Seismic Experiment sensors were deployed that detected lunar moonquakes and provided ... 110106.html ref Passive seismic is much cheaper than well drilling. It is also more cheaper and environment friendly than active seismic which requires the strong source of the seismic waves like underground ... more details
of rock density and p wave velocity. Unlike seismic reflection data, which is an interface property ... and Interference wave propagation interference caused by the wavelet. CSSI transforms seismic data ...wikify date February 2009 Seismic inversion is the process of transforming reflection seismology seismic ... . Seismic inversion may be pre or post stack, deterministic, stochastic or geostatistical, and typically ... seismology Seismic surveys are routinely performed to gather information about the geology ... 20effect tuning effects introduced by the wavelet can be removed. Seismic data can be inspected and interpreted ... oil and gas companies now use seismic inversion to increase the resolution and reliability of the data and to improve estimation of rock properties including porosity and net pay. ref Pendrel, J., Seismic ... 6, 2006, p. 19 22. ref There are many different techniques used in seismic inversion . ref Sen, M. K., Seismic Inversion , Society of Petroleum Engineers, 2006. ref These can be roughly grouped into two sets of categories pre stack vs. post stack, and seismic resolution vs. well log resolution. The combination ... Jason. Wavelet estimation All modern seismic inversion methods require seismic data and a wavelet ... of the seismic survey is used to estimate the wavelet phase waves phase and frequency. Accurate wavelet estimation is absolutely critical to the success of any seismic inversion. The inferred shape of the seismic wavelet may strongly influence the seismic inversion results and therefore subsequent ... are estimated statistics statistically from either the seismic data alone or from a combination of seismic ... available. After the seismic wavelet is estimated it is in turn used to estimate seismic reflection coefficients in the seismic inversion. When the estimated constant phase of the statistical wavelet ... impedance impedance log to the seismic. Errors in well tie can result in phase or frequency artifacts in the wavelet estimation. Once the wavelet is identified, seismic inversion computes a synthetic ... more details
curtis06 harvnb Curtis Gerstoft Sato Snieder 2006 ref Seismic interferometry SI utilizes the cross ... receiver pair using seismic interferometry. Crosscorrelation is often considered the key mathematical ... for an active seismic source . ref name drag06 This method, however, is not limited to passive sources, and can be extended for use with Seismic source active sources and computer&ndash generated waveform s. ref name curtis06 File Seismicwave prop mine.gif thumb Image showing usefulness of seismic waves to investigate the subsurface As of 2006 the field of seismic interferometry was beginning to change the way geophysics geophysicists view noise. Seismic interferometry uses this previously&ndash ... and industry. ref name curtis06 History and Development Claerbout 1968 first considered seismic interferometry for investigating the shallow subsurface. He later predicted that seismic interferometry ... record of background noise, initially only for the surface and direct wave arrivals. ref harvnb Wapenaar 2004 ref ref harvnb Campillo Paul 2003 ref Crosscorrelations of seismic signals from both active ... of the subsurface. ref name sysr04 harvnb Schuster Yu Sheng Rickett 2004 ref Seismic interferometry ... Explanation Seismic interferometry provides for the possibility of reconstructing the subsurface reflection response using the crosscorrelations of two seismic traces. ref name curtis06 ref ... applications of crosscorrelation for reconstructing Greens function Green s function using wave .... Seismic interferometry essentially exploits the phase difference between adjacent receiver locations to image the subsurface. Seismic interferometry consists of simple crosscorrelation and stacking ... relative to the first. ref http mathworld.wolfram.com Convolution.html Animation ref Seismic ... by the interference of a direct and reflected wave passing through a glass lens where intensity is primarily ... of the direct wave at a location A with the reflection recorded at a location B where ... more details
risk analysis. Methods of seismic microzonation Dynamic characteristics of site such as predominant period , amplification factor, shear wave velocity , standard penetration test values can be used for seismic microzonation purpose. Shear wave velocity measurement and standard penetration test ...Orphan date March 2011 Image bangkok microzonation map.jpg thumb right 300px Seismic microzonation map of Greater Bangkok prepared based on predominant period of site obtained from microtremor observations ref name Tuladhar Tuladhar, R., Yamazaki, F., Warnitchai, P & Saita, J., Seismic Microzonation ... engineering Seismic microzonation is defined as the process of subdividing a potential seismic or earthquake ..., earthquake related flooding, so that seismic hazards at different locations within the area can ..., P & Saita, J., Seismic Microzonation of the Greater Bangkok area using Microtremor Observations ... journal 106564765 abstract ref In most general terms, seismic microzonation is the process of estimating ... , Proc. 4th International Conference on Seismic Zonation, 1 199 259 ref Regional geology ... according to the local geology. A seismic zonation map for a whole country may, therefore, be inadequate for detailed seismic hazard assessment of the cities. This necessitates the development of microzonation maps for big cities for detailed seismic hazard analysis. ref Schell, B. A. et al ... sites. Seismic microzonation can be considered as the preliminary phase of earthquake risk mitigation .... Seismic Microzonation Map of Tokyo. Proc. of Second International Conf. on Microzonation for Safer .... In the lake bed area, the soft clay deposits have shear wave velocities ranging from 40 to 90 m s and the underlying hard strata has a shear wave velocity in the range 500 m s or greater. During the earthquake of 1985, the seismic waves were trapped in the soft strata. The soft soil layer allowed the upward .... References reflist Category Earthquake and seismic risk mitigation Category Earthquake engineering ... more details
Expert subject Geology date February 2009 Seismic to Simulation is the process and associated techniques ... well logging well logs , seismic data and production history. Introduction Reservoir models ..., including well logs, Reflection seismology seismic surveys , and production history. Seismic to simulation ... and rock properties, geostatistics geostatistical inversion to determine a set of plausible seismic ..., stratigraphy stratigraphic grid transfer to accurately move seismic derived data to the geologic ... all the data. Rock Physics and Petrophysics The first step in seismic to simulation is establishing .... This is required in order to find common ground between the well logs and seismic data. ref ... high resolution vertical data, but no insight into the inter well space. Seismic are measured in time ..., well logs and seismic can be used to create a fine scale 3D model of the subsurface. Insight into the rock ... provide samples to verify and fine tune that understanding. Seismic data is used by petrophysicists ... well space using seismic inversion attributes such as acoustic impedance impedance . Seismic surveys ..., the sound wave Reflection seismology reflects and refraction refracts as a function of the impedance .... MCMC Geostatistical Inversion In the next step of seismic to simulation, seismic inversion techniques combine well and seismic data to produce multiple equally plausible 3D models of the elastic properties of the reservoir. Seismic data is transformed to elastic property log s at every trace. Deterministic ... of Stochastic Seismic Inversion , CSEG Records, February 2005, p. 5 11. ref Geostatistical inversion ... Stochastic Inversion of Well Logs and 3D Pre Stack Seismic Amplitude Data , SPE 102444. ref Markov ... seismic derived rock properties with vertical sampling compatible to geologic models. All field ... with the seismic, wells, and geology . Geostatistical inversion simultaneously inverts for impedance ... time to depth for the various properties and transfers them in 3D from the seismic grid to a corner ... more details
Image African Bush Elephants.jpg thumb right African Bush Elephant and her young Seismic communication describes communication through seismology seismic vibrations of the earth. Seismic cues are generated through percussion on the earth substrate or acoustical waves that couple with the earth, called rayleigh waves . Overview Image DispersionRayleighWave.jpg right thumb 135px Dispersion of Rayleigh wave s in a thin gold film on glass. http kino ap.eng.hokudai.ac.jp index.html The haptic sense is employed by a range of small mammals as a mechanism of prey detection, predator warning and avoidance, and habitat sensing. Though recently, many studies have indicated intentional use of ground vibrations as a means of communication among the Cape mole rat ref Narins PM, Reichman OJ, Jarvis JUM, Lewis ER. Seismic signal transmission between burrows of the cape mole rat Georychus capensis. J Comp .... Seismic properties of elephant vocalizations and locomotion. J Acoust Soc Am 108 3066 3072, 2000. ref ... to the Ground Seismic Communication in Elephants O Connell Rodwell 22 4 287 Physiology accessdate 2010 ... agitated and fled to higher ground before the devastating wave struck, thus saving their own lives ... elephants were responding to these events. ref name psyorg Seismic energy transmits most efficiently ... of an elephant rumble . ref cite web url http elephantvoices.org elephant communication seismic communication.html title Seismic communication author Petter Granli first Petter last Granli accessdate ... through the ground. Thus, African Bush Elephant s are able to use seismology seismic vibrations ..., C. E., & Klemperer, S. L. year 2004 title Seismic waves from elephant vocalizations A possible ... cite web url http www.oaklandzoo.org conservation programs conservation on site elephant seismic communication title Elephant Seismic Communication author conservation first conservation accessdate 2010 ... Are seismic communication signals transmitted by bone conduction in the blind mole rat? Hearing Research ... more details
Citations missing date September 2008 A seismic scale is used to calculate and compare the severity of earthquake s. For a quick review, see the table of seismic scales at the end of this article. Two fundamentally different but equally important types of scales are commonly used by seismologists to describe earthquakes. The original force or energy of an earthquake is measured on a magnitude scale , while the intensity of shaking occurring at any given point on the Earth s surface is measured on an intensity scale . Magnitude and Intensity The severity of an earthquake is described by both magnitude and intensity . These two frequently confused terms refer to different, but related, observations. Magnitude, usually expressed as an Arabic numeral that is 1,2,3,4,5,6,7,8,9,0.... characterizes the size of an earthquake by measuring indirectly the energy released. By contrast, intensity indicates the local effects and potential for damage produced by an earthquake on the Earth s surface as it affects .... Seismic intensity scales The first simple classification of earthquake intensity was devised by Domenico ... seismic intensity scale Shindo scale is used in Japan , the MSK 64 MSK 64 scale is used in India , Israel , Russia and throughout the Commonwealth of Independent States CIS , and the China Seismic ... the earthquake. Other more recent magnitude measurements include body wave magnitude m sub b sub , surface wave magnitude M sub s sub , and duration magnitude M sub D sub . Each of these is scaled to give ... for local magnitude surface wave magnitude saturates above 8. Despite the limitations of older magnitude ... the most reliable estimate of earthquake size. This is because seismic moment is derived from the concept ... released. So while seismic moment, too, is calculated from seismogram s, it can also be obtained ... Earthquake duration magnitude Earthquake engineering Seismic performance Seismic scales DEFAULTSORT Seismic Scale Category Seismic scales Category Seismology Category Earthquake engineering de ... more details
Main Earthquake engineering Seismic risk uses the results of a seismic hazard analysis, and includes both consequence and probability. Seismic risk has been defined, for most management purposes, as the potential economic, social and environmental consequences of hazardous events that may occur in a specified ... located in a region of high seismic hazard is at lower risk if it is built to sound seismic .... A special subset is urban seismic risk which looks at the specific issues of cities. Risk determination ... of seismic risk The determination of seismic risk is the foundation for risk mitigation ... power systems are also considered. Insurance companies routinely employ estimates of seismic risk in their operations ... in a small area, and to purchase reinsurance. A simplified method of calculating seismic risk for a given ... part1.pdf If you know the level of seismic hazard, the damage generally follows established patterns. Seismic risk is often determined using a seismic modeling computer programs which uses the seismic ... prevent hazus . While the results can be used as a general measure of seismic risk for types of buildings, the actual seismic risk for any individual building may vary considerably and will depend upon ... building or facility is one of the most expensive and daunting aspects of seismic risk estimation. Progress is made if one can calculate the fragility or seismic capacity of the components within a structure. http fire.nist.gov bfrlpubs build98 PDF b98106.pdf Reduction of seismic risk Seismic risk ... codes are intended to help to manage seismic risk and are updated as more is learned about the effects of seismic ground motion on buildings. However, the changes generally do not immediately improve seismic risk in a community since existing buildings are rarely required to be upgraded to meet the revisions. External links C. Allin Cornell http www.fema.gov hazus HAZUS Seismic Risk Program ... Mashups Category Earthquake and seismic risk mitigation es Riesgo s smico fr Risque sismique it Rischio ... more details
Washington that had lain dormant for 123 years, began to experience Seismicwaveseismic activity ...Unreferenced date February 2007 Infobox television show name Seismic Seconds image caption show name 2 genre Documentary br Disaster format creator developer writer director creative director presenter starring judges voices narrated theme music composer opentheme endtheme composer country United Kingdom br United States language English num seasons 1 num episodes 6 list episodes executive producer producer editor location cinematography camera runtime 22 minutes company National Geographic Society distributor ITV channel National Geographic Channel picture format audio format first run first aired start date Late 1990s last aired status preceded by followed by Seconds from Disaster related website production website Seismic Seconds is a documentary television series that aired in the late 1990s on the National Geographic Channel . The program analysed the causes of six incidents, five involving the loss of human life. The better known sequel to Seismic Seconds , Seconds From Disaster , was spin off media spun off from the series. In the British version, the narrator says in the voiceover Cquote Disasters don t just happen. They re the result of a sequence of events, locked together in time. The science behind what went wrong is hidden in those seismic seconds. Episodes class wikitable Title Disaster Date of disaster Nature of disaster rowspan 2 1 Bhopal Gas Disaster Bhopal disaster 3 December 1984 Human error bgcolor FFFFFF colspan 4 In Bhopal , India, lethal methyl isocyanate gas was accidentally released from a pesticide s plant run by a subsidiary of Union Carbide . Between 2,500 and 5,000 people in Bhopal died on the day of the disaster, and thousands more have died since from ill effects. rowspan 2 2 Crash of TWA 800 TWA Flight 800 17 July 1996 Electrical fault, central fuel tank explosion bgcolor FFFFFF colspan 4 Over the Atlantic Ocean, a Boeing 747 operating as TWA ... more details
Orphan date December 2010 Seismic Bluff coor dm 77 32 S 167 5 E is a steep bluff at c.3470 m on the southwest rim of the summit caldera of Mount Erebus , Ross Island . So named after a seismic station nearby. usgs gazetteer Category Geography of Antarctica EAntarctica geo stub ... more details
of California, Berkeley was an early base for computer based seismic analysis of structures ... to represent the effect of earthquake ground motion, typically defined by a seismic design ... viscous damping matrix. The seismic input is modelled using either modal spectral analysis or time ... SDOF structural models and represent seismic ground motion with response spectra. Story drifts and component ... ground motion used as seismic input therefore, several analyses are required using different ... Seismic Analysis Software References note FEMA356 ASCE. 2000 . Pre standard and Commentary for the Seismic ... , illustrated essays by Robert Reitherman, CUREE, 1997, p12. Category Earthquake and seismic ... ru simple Seismic performance analysis ... more details
orphan date February 2010 A seismic vibrator or vibroseis ref Vibroseis was formerly a trademark of Continental Oil Company &mdash 0737865, September 18, 1962 and 0735470, July 31, 1962&mdash but both trademarks have been cancelled. ref is a truck mounted device that is capable of injecting low frequency vibrations into the earth. It is one of a number of seismic source s used in reflection seismology . Seismic vibrators are used to perform about half of all seismic surveys on land. ref cite web url http www.amazon.com Vibroseis Source Guido Baeten dp 0444888799 title The Vibroseis Source, by Guido Baeten and A. Ziolkowski accessdate 2008 07 08 publisher Amazon date 1990 quoted from Amazon s book description. ref The plot of Ken Follett s 1998 thriller The Hammer of Eden turns on the use of a stolen seismic vibrator truck by ecoterrorists. External links http video.google.com videoplay?docid 749628618699365360 Vibrating the earth Vibroseis Video of a seismic vibrator in use http www.kgs.ku.edu Publications GeoRecord 2000 vol6.2 Page1.html Seismic Research at the KGS , description of seismic vibrator and how the Kansas Geological Survey uses it http www.habitat.adfg.alaska.gov vibroseis.php Alaska Department of Fish and Game , image of a vibroseis in use http www.geosys.co.jp GEO IVI Geosys IVI Pictures and descriptions of seismic vibrators manufactured by Geosys, Inc. of Japan http www.litho.ucalgary.ca transect info snorcle photos nwt.html Vibrator truck Images of a vibrator trucks used by the University of Calgary Notes and references references http www.indvehicles.com Industrial Vehicles International is a manufacturer of Seismic Vibrators DEFAULTSORT Seismic Vibrator Category Geology geology stub ... more details
Seismic Unix is an List of free geophysics software open source seismic utilities package supported by the Center for Wave Phenomena CWP at the Colorado School of Mines CSM . Infobox software name Seismic Unix screenshot Image Seismic Velocity Analysis.png 150px Velocity Analysis with SU caption Velocity Analysis with SU developer http www.cwp.mines.edu CWP latest release version SU 42 latest release ... STATEMENT Reserved website http www.cwp.mines.edu cwpcodes Seismic Unix Home History Einar Kjartansson ... who pioneered seismic processing on Unix in the seventies and early eighties. In 1986, Shuki ... in the 11 years. There have been many contributors to SU over the past two decades. Syntax The Seismic .... i.su done source In the example above Seismic Unix will create 100 seismograms in 100 different ... Seismic Unix has many of the processes needed on the geophysical processing. It is possible to use ... http sepwww.stanford.edu oldsep cliner files suhelp wpc1comp2.txt wpc1comp2 Compress a 2D seismic ... wpc1uncomp2.txt wpc1uncomp2 Uncompress a 2D seismic section, which has been compressed using Wavelet ... oldsep cliner files suhelp sucmp.txt sucmp CoMPare two seismic data sets, returns 0 to the shell ... sugabor Outputs a time frequency representation of seismic data via the Gabor transform like multifilter ... oldsep cliner files suhelp sulog.txt sulog time axis log stretch of seismic traces http sepwww.stanford.edu oldsep cliner files suhelp suilog.txt suilog time axis inverse log stretch of seismic ... suhelp sutsq.txt sutsq time axis time squared stretch of seismic traces http sepwww.stanford.edu oldsep ... sumix compute weighted moving average trace MIX on a panel of seismic data http sepwww.stanford.edu ... files suhelp suvlength suvlength Adjust variable length traces to common length SU community Seismic ... ref References reflist http aqueleabraco.wordpress.com sismica guiasu SUguide Seismic Unix Install ... School of Mines pl Seismic Unix ... more details
orphan date April 2010 refimprove date April 2010 In seismology , a seismic trace refers to the recorded curve from a single seismometer seismograph when measuring ground movement. The name comes from the curve plotted by a seismograph as the paper roll rotated and the needle left a trace from which information about the subsurface could be extracted. Today s instruments record the data digitally and the word trace has come to mean the digital curve. Complex seismic trace The recorded seismic trace is considered the real number real part of the complex number complex trace. By phase shifting the recorded trace by 90 degrees, we can obtain the imaginary number imaginary part of the complex trace. The complex seismic trace is a complex function whose real and imaginary part are the previously mentioned ref name Barnes cite journal last Barnes first A.E. year 2007 title A tutorial on complex seismic trace analysis journal Geophysics volume 72 pages W33 W43 ref . From the complex trace, one can now define seismic attribute s such as the complex amplitude, phase, instantaneous phase and instantaneous frequency. References Reflist Category Seismology measurement Category Seismology ... more details
When building a house, regional seismic hazard maps are used to find the best or the worst place to locate for earthquake shaking. ref http earthquakescanada.nrcan.gc.ca hazard zoning haz e.php Natural Resources Canada page on Seismic Hazard Calculations ref Although greatly confused with its sister, seismic risk , seismic hazard is the study of expected earthquake ground motions at any point on the earth. Image RogersCrkNorthHayward.gif thumb 250px right Surface motion map for a hypothetical earthquake ... Creek Fault Zone The calculations for seismic hazard, first formulated by C. Allin Cornell in 1968, ref http www.geoscienceworld.org cgi georef 1968056524 Cornell, C.A. 1968, Engineering seismic ... 20History.pdf McGuire, R. 2008, Probabilistic seismic hazard analysis Early history, Earthquake Engng ... in 500 years chance, while nuclear plants look at the 10,000 year time frame. A longer term seismic ... spectrum for use in seismic analysis . More elaborate variations on the theme also look at the soil conditions. ref http www.ias.ac.in jess nov2008 jess124.pdf Wang, Z. 2008. A technical note on seismic ... on solid rock. The standard seismic hazard calculations become adjusted upwards if you are postulating ... In most seismic hazard analyses, the maximum considered earthquake , or maximum considered event .... US seismic hazard maps Some maps released by the USGS are shown with peak ground acceleration with a 10 ..., the National Seismic Hazard Mapping Project in 2008 resulted in seismic hazard maps showing peak ... C. Allin Cornell Earthquake engineering Mitigation of seismic motion Neotectonics Seismic performance Vibration control References Reflist External links U.S. Geological Survey National Seismic Hazard Maps http earthquake.usgs.gov research hazmaps The Global Seismic Hazard map http www.seismo.ethz.ch ..., Vancouver, Canada http www.hazardmapping.com Seismic Risk Analysis using GIS Evaluation of Structural ... Seismic Hazard Category Earthquake and seismic risk mitigation es Peligro s smico it Pericolo sismico ... more details
A seismic gap is a segment of an active fault that has not slipped in an unusually long time when compared with other segments along the same structure. Seismic gap hypothesis theory states that, over long periods of time, the displacement on any segment must be equal to that experienced by all the other parts of the fault. ref http www.springerlink.com content l00354272m4x15l6 McCann, W.R., Nishenko, S.P., Sykes, I.R. & Krause, J. 1979. Seismic gaps and plate tectonics seismic potential for major boundaries. Pure and applied geophysics, 117, 1082 1147 ref Any large and longstanding gap is therefore considered to be the fault segment most likely to suffer future earthquake s. The applicability of this approach has been criticised by some seismologist s, ref http www.agu.org pubs crossref 1991 91JB02210.shtml Kagan, Y.K. & Jackson, D.D. 1991. Seismic Gap Hypothesis Ten Years After. Journal of Geophysical Research, 96 B13 , 21,419 21,431 ref although it has been used successfully in some areas see examples below . Examples Image USGS 1045 Fig5.jpg right 400px thumb Cross sections along the San Andreas fault showing recorded seismic activity A 20 years before the Loma Prieta event, B The main shock large circle and aftershocks for the Loma Prieta event, USGS Circular 1045 Loma Prieta Seismic Gap, California Prior to the 1989 Loma Prieta earthquake , that segment of the San Andreas fault system recorded much less seismic activity than other parts of the fault. ref http pubs.er.usgs.gov djvu CIR circ 1045.djvu Lessons Learned from the Loma Prieta, California, Earthquake of October 17, 1989. U.S.G.S. Circular 1045 N.B. requires free ie djvu plug in to view ref The main shock and aftershock s of the 1989 event occurred within the previous seismic gap. Central Kuril gap, Russia Immediately following the 2004 Indian Ocean earthquake , a seismic gap analysis of the seismic zones ... earthquake.usgs.gov learning glossary.php?term seismic 20gap USGS glossary entry DEFAULTSORT Seismic ... more details
Infobox Album See Wikipedia WikiProject Albums Name Seismic Type Album Artist Dogwood band Dogwood Cover Seismicalbum.jpg Released January 28, 2003 Recorded Genre Punk rock Length Label Tooth & Nail Records Producer Sean O Donnell Sam Boukas Reviews Blogcritics http blogcritics.org music article dogwood seismic ARTISTdirect Rating 3 5 http www.artistdirect.com nad store artist album 0,,2504185,00.html Jesus Freak Hideout Rating 4 5 http www.jesusfreakhideout.com cdreviews Seismic.asp link Sputnik Music Rating 3 5 http www.sputnikmusic.com review 36855 Dogwood Seismic PunkNews Rating 4.5 5 http www.punknews.org review 1620 Aversionline Rating 6 10 http www.aversionline.com reviews 1354 Indieworkshop http www.indieworkshop.com archive music.php?id 192 Last album Matt Aragon br 2002 This album Seismic br 2003 Next album Reverse, Then Forward Again br 2004 Seismic is the seventh studio album by San Diego San Diegan punk rock punk band Dogwood band Dogwood , originally titled Your Tongue Is the Deadliest of Arrows by the band. Artwork photos feature former members Scott Bergen and Eddie Spangler, although they did not perform on the album s recording, and both had left the band by the time of its release. Bassist Jason Harper announced he was leaving the group during the album s recording. Track listing Seismic Selfish Americans Conscience in a Cave Sunsets Are But Once a Day Absolution Home Is Here Your Tongue Is the Deadliest of Arrows Trailer Full of Tragedies Faith What Matters Last of the Lost Crushing Dogwood Category Dogwood albums Category 2003 albums Category Tooth & Nail Records albums 2000s Christianrock album stub 2000s punk album stub pt Seismic ... more details
Infobox Album See Wikipedia WikiProject Albums Name Of Seismic Consequence Album Type Studio Artist Yakuza band Yakuza Cover Released June 22, 2010 small United States U.S. small br June 14, 2010 small United Kingdom U.K. small Recorded Genre Avant garde metal br Progressive metal Length 51 55 Label Profound Lore Records Producer Sanford Parker Reviews Allmusic Rating 4.5 5 http www.allmusic.com album of seismic consequence r1810120 link Pitchfork Media 7.7 10 http pitchfork.com reviews albums 14448 of seismic consequence link Last album Transmutations album Transmutations br 2007 This album Of Seismic Consequence br 2010 Next album Of Seismic Consequence is the fifth full length studio album by Chicago based progressive metal band Yakuza band Yakuza . It was released on June 22, 2010 by Profound Lore Records . Track listing The Ant People 3 48 Thinning the Herd 3 37 Stones and Bones 5 40 Be That As It May 8 10 Farewell to the Flesh 11 12 Testing the Waters 6 27 Good Riddance Knuckle Walkers 2 59 The Great War 2 44 Deluge 7 18 Personnel Bruce Lamont saxophone , vocals James Staffel drum kit drums Matt McClelland guitar , vocals Ivan Cruz bass guitar DEFAULTSORT Of Seismic Consequence Category Yakuza band albums Category 2010 albums 2000s alt metal album stub 2000s metal album stub ... more details
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