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seismic velocity

Overview page. Subjects: Earth Sciences and Geography.

The speed with which an elastic wave propagates through a medium. For non-dispersive body waves, the seismic velocity is equal to both the phase and group velocities; for dispersive surface...

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seismic velocity

Overview page. Subjects: Earth Sciences and Geography.

The speed with which an elastic wave propagates through a medium. For non-dispersive body waves, the seismic velocity is equal to both the phase and group velocities; for dispersive surface...

See overview in Oxford Index

seismic velocity

Edited by MICHAEL ALLABY.

in A Dictionary of Earth Sciences

January 2008; p ublished online January 2008 .

Reference Entry. Subjects: Earth Sciences and Geography. 75 words.

The speed with which an elastic wave propagates through a medium. For non-dispersive body waves, the seismic velocity is

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seismic velocity

Michael Allaby.

in A Dictionary of Geology and Earth Sciences

January 2013; p ublished online September 2013 .

Reference Entry. Subjects: Earth Sciences and Geography. 78 words.

The speed with which an elastic wave propagates through a medium. For non-dispersive *body waves, the seismic velocity is equal to both the ...

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Wide-angle seismic velocities in heterogeneous crust

John Brittan and Mike Warner.

in Geophysical Journal International

May 1997; p ublished online May 1997 .

Journal Article. Subjects: Geophysics. 0 words.

Summary

Seismic velocities measured by wide-angle surveys are commonly used to constrain material composition in the deep crust. Therefore, it is important...

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Seismic velocities of the uppermost igneous crust versus age

Ingo Grevemeyer and Wilfried Weigel.

in Geophysical Journal International

February 1996; p ublished online February 1996 .

Journal Article. Subjects: Geophysics. 0 words.

Summary

Seismic refraction velocity data from the acoustic basement (called layer 2A) have been compiled for different mid-ocean ridges. The data from...

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Inversion of seismic attributes for velocity and attenuation structure

Robert L. Nowack and Michael P. Matheney.

in Geophysical Journal International

March 1997; p ublished online March 1997 .

Journal Article. Subjects: Geophysics. 0 words.

Summary

We have developed an inversion formuialion for velocity and attenuation structure using seismic attributes, including envelope amplitude,...

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Effects of fractures on seismic-wave velocity and attenuation

Fred Kofi Boadu and Leland Timothy Long.

in Geophysical Journal International

October 1996; p ublished online October 1996 .

Journal Article. Subjects: Geophysics. 0 words.

The effects of fractures on the seismic velocity and attenuation of a rock are investigated using theoretical results and experimental data. Fractures in a rock mass influence the...

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Seasonal variations of seismic velocities in the San Jacinto fault area observed with ambient seismic noise

G. Hillers, Y. Ben-Zion, M. Campillo and D. Zigone.

in Geophysical Journal International

P ublished online June 2015 .

Journal Article. Subjects: Volcanology and Seismology. 9193 words.

We observe seasonal seismic wave speed changes (dv/v) in the San Jacinto fault area and investigate several likely source mechanisms. Velocity variations are obtained from analysis of 6 yr...

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Velocity continuation in the downward continuation approach to seismic imaging

Anton A. Duchkov and Maarten V. de Hoop.

in Geophysical Journal International

March 2009; p ublished online March 2009 .

Journal Article. Subjects: Geophysics. 7945 words.

Summary

One way of developing a wave-equation approach to seismic imaging is based on the concept of downward continuation of observed surface reflection...

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Propagation of the velocity model uncertainties to the seismic event location

A. Gesret, N. Desassis, M. Noble, T. Romary and C. Maisons.

in Geophysical Journal International

P ublished online November 2014 .

Journal Article. Subjects: Geophysics. 7328 words.

Earthquake hypocentre locations are crucial in many domains of application (academic and industrial) as seismic event location maps are commonly used to delineate faults or fractures. The...

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Stochastic characterization of mesoscale seismic velocity heterogeneity in Long Beach, California

Nori Nakata and Gregory C. Beroza.

in Geophysical Journal International

P ublished online November 2015 .

Journal Article. Subjects: Volcanology and Seismology. 4048 words.

Earth's seismic velocity structure is heterogeneous at all scales, and mapping that heterogeneity provides insight into the processes that create it. At large scale lengths, seismic...

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Detecting seasonal variations in seismic velocities within Los Angeles basin from correlations of ambient seismic noise

Ueli Meier, Nikolai M. Shapiro and Florent Brenguier.

in Geophysical Journal International

May 2010; p ublished online May 2010 .

Journal Article. Subjects: Geophysics. 6430 words.

Summary

We analyse 3 yr of continuous seismic records from broad-band stations of the Caltech Regional Seismic Network (CI) in vicinity of the Los Angeles...

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Seismic velocity anisotropy in mica‐rich rocks: an inclusion model

O. Nishizawa and T. Yoshino.

in Geophysical Journal International

April 2001; p ublished online April 2001 .

Journal Article. Subjects: Geophysics. 8551 words.

Summary

We calculated seismic wave velocity anisotropy caused by the preferred orientation of mica minerals by using the differential effective medium method...

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Distinguishing eclogite from peridotite: EBSD-based calculations of seismic velocities

James R. Worthington, Bradley R. Hacker and George Zandt.

in Geophysical Journal International

April 2013; p ublished online February 2013 .

Journal Article. Subjects: Geophysics. 10299 words.

Seismic velocities were calculated for 11 eclogites from the Western Gneiss Region, Norway, based on electron-backscatter diffraction (EBSD). The P-wave velocities are 8.0–8.5 km s–1 and...

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Using glacier seismicity for phase velocity measurements and Green's function retrieval

Fabian Walter, Philippe Roux, Claudia Roeoesli, Albanne Lecointre, Debi Kilb and Pierre-François Roux.

in Geophysical Journal International

P ublished online April 2015 .

Journal Article. Subjects: Volcanology and Seismology. 10441 words.

High-melt areas of glaciers and ice sheets foster a rich spectrum of ambient seismicity. These signals not only shed light on source mechanisms (e.g. englacial fracturing, water flow,...

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Velocity images from stacking depth-slowness seismic wavefields

Geraint D. Jones, Penny J. Barton and Satish C. Singh.

in Geophysical Journal International

February 2007; p ublished online February 2007 .

Journal Article. Subjects: Geophysics. 7459 words.

Summary

We present synthetic and real data examples processed using a depth imaging method for long-offset multichannel seismic data via the...

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Constraints on earthquake epicentres independent of seismic velocity models

T. Nicholson, Ó. Gudmundsson and M. Sambridge.

in Geophysical Journal International

March 2004; p ublished online March 2004 .

Journal Article. Subjects: Geophysics. 4487 words.

Summary

We investigate the constraints that may be placed on earthquake epicentres without assuming a model for seismic wave speed variation within the...

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Velocity macro-model estimation from seismic reflection data by stereotomography

Frédéric Billette and Gilles Lambaré.

in Geophysical Journal International

November 1998; p ublished online November 1998 .

Journal Article. Subjects: Geophysics. 10809 words.

We introduce a new tomographic method for estimating velocity macro-models from seismic reflection data. In addition to traveltimes picked on locally coherent reflected events, the method...

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Seismic velocity structure at the southeastern margin of the Arabian Peninsula

S. Al-Hashmi, R. Gök, K. Al-Toubi, Y. Al-Shijbi, I. El-Hussain and A. J. Rodgers.

in Geophysical Journal International

August 2011; p ublished online August 2011 .

Journal Article. Subjects: Geophysics. 5091 words.

Summary

The lithospheric structure in Oman has been determined by analyzing teleseismic P-receiver functions recorded at broad-band and short-period seismic...

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Seismic attenuation and velocity dispersion in heterogeneous partially saturated porous rocks

J. Germán Rubino and Klaus Holliger.

in Geophysical Journal International

March 2012; p ublished online March 2012 .

Journal Article. Subjects: Geophysics. 8836 words.

Summary

Using a numerical approach, we explore wave-induced fluid flow effects in partially saturated porous rocks in which the gas-water saturation patterns...

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