HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by NUR, A. Search for Related Content GeoRef GeoRef Citation

Dilatancy, pore fluids, and premonitory variations of t_s/t_p travel times

DEPARTMENT OF GEOPHYSICS STANFORD UNIVERSITY, STANFORD, CALIFORNIA 94305

Abstract

Nerseov et al. (1969) found that the travel-time ratio of shear and compressional waves, = t_s/t_p varies prior to the occurrence of earthquakes in the Garm region, USSR. Laboratory results indicate that the decrease of can result from dilatancy of rocks around the focal zone. The subsequent increase of , which terminates with an earthquake, can be caused by the flow of ground water into the dilated zone. The increasing pore pressure weakens the rock and leads to the observed failure.

This article has been cited by other articles:

				Y.-G. Li, P. Chen, E. S. Cochran, J. E. Vidale, and T. Burdette Seismic Evidence for Rock Damage and Healing on the San Andreas Fault Associated with the 2004 M 6.0 Parkfield Earthquake Bulletin of the Seismological Society of America, September 1, 2006; 96(4B): S349 - S363. [Abstract] [Full Text] [PDF]

				D. Patane, G. Barberi, O. Cocina, P. De Gori, and C. Chiarabba Time-resolved seismic tomography detects magma intrusions at Mount Etna. Science, August 11, 2006; 313(5788): 821 - 823. [Abstract] [Full Text] [PDF]

				L. Telesca, V. Lapenna, and M. Macchiato Multifractal variability in self-potential signals measured in seismic areas Geological Society, London, Special Publications, January 1, 2006; 261(1): 95 - 103. [Abstract] [PDF]

				C.-P. Lee and Y.-B. Tsai Variations of P-Wave Travel-Time Residuals before and after the 1999 Chi-Chi, Taiwan, Earthquake Bulletin of the Seismological Society of America, December 1, 2004; 94(6): 2348 - 2365. [Abstract] [Full Text] [PDF]

				Anisotropic Changes in P-Wave Velocity and Attenuation during Deformation and Fluid Infiltration of Granite Bulletin of the Seismological Society of America, August 1, 2003; 93(4): 1803 - 1822.

				Postseismic Fault Healing on the Rupture Zone of the 1999 M 7.1 Hector Mine, California, Earthquake Bulletin of the Seismological Society of America, April 1, 2003; 93(2): 854 - 869.

				C. G. Sammis and D. Sornette Positive feedback, memory, and the predictability of earthquakes PNAS, February 19, 2002; 99(suppl_1): 2501 - 2508. [Abstract] [Full Text] [PDF]

				Coseismic hydrologic response of an alluvial fan to the 1999 Chi-Chi earthquake, Taiwan Geology, September 1, 2001; 29(9): 831 - 834.

				Postseismic fluid flow after the large subduction earthquake of Antofagasta, Chile Geology, September 1, 2001; 29(9): 847 - 850.

				Y. Li, J. E. Vidale, K. Aki, F. Xu, and T. Burdette Evidence of Shallow Fault Zone Strengthening After the 1992 M7.5 Landers, California, Earthquake Science, January 9, 1998; 279(5348): 217 - 219. [Abstract] [Full Text]

				M. Wyss;, R. L. Aceves, S. K. Park;, R. J. Geller, D. D. Jackson, Y. Y. Kagan, and F. Mulargia; Cannot Earthquakes Be Predicted? Science, October 17, 1997; 278(5337): 487 - 490. [Full Text]

				Y.-G. Li, W. L. Ellsworth, C. H. Thurber, P. E. Malin, and K. Aki Fault-zone guided waves from explosions in the San Andreas fault at Parkfield and Cienega Valley, California Bulletin of the Seismological Society of America, February 1, 1997; 87(1): 210 - 221. [Abstract] [PDF]

				J. S. Haase, P. M. Shearer, and R. C. Aster Constraints on temporal variations in velocity near Anza, California, from analysis of similar event pairs Bulletin of the Seismological Society of America, February 1, 1995; 85(1): 194 - 206. [Abstract] [PDF]

				R. Nadeau, M. Antolik, P. A. Johnson, W. Foxall, and T. V. McEvilly Seismological studies at Parkfield III: Microearthquake clusters in the study of fault-zone dynamics Bulletin of the Seismological Society of America, April 1, 1994; 84(2): 247 - 263. [Abstract] [PDF]

				R. H. Sibson Crustal stress, faulting and fluid flow Geological Society, London, Special Publications, January 1, 1994; 78(1): 69 - 84. [Abstract] [PDF]

				J.-M. CHIU, A. C. JOHNSTON, A. G. METZGER, L. HAAR, and J. FLETCHER Analysis of analog and digital records of the 1982 Arkansas earthquake swarm Bulletin of the Seismological Society of America, October 1, 1984; 74(5): 1721 - 1742. [Abstract] [PDF]

				I. KAWASAKI and T. TANIMOTO Radiation patterns of body waves due to the seismic dislocation occurring in an anisotropic source medium Bulletin of the Seismological Society of America, February 1, 1981; 71(1): 37 - 50. [Abstract] [PDF]

				F. T. WU, Y. H. YEH, and Y. B. TSAI Seismicity in the Tsengwen reservoir area, Taiwan Bulletin of the Seismological Society of America, December 1, 1979; 69(6): 1783 - 1796. [Abstract] [PDF]

				C. H. Scholz and C. H. SCHOLZ Velocity Anomalies in Dilatant Rock Science, August 4, 1978; 201(4354): 441 - 442. [Abstract] [PDF]

				A. G. LINDH, D. A. LOCKNER, and W. H. K. LEE Velocity anomalies: An alternative explanation Bulletin of the Seismological Society of America, June 1, 1978; 68(3): 721 - 734. [Abstract] [PDF]

				J. A. STEPPE, W. H. BAKUN, and C. G. BUFE Temporal stability of P-velocity anisotropy before earthquakes in central California Bulletin of the Seismological Society of America, August 1, 1977; 67(4): 1075 - 1090. [Abstract] [PDF]

				M. WYSS The appearance rate of premonitory uplift Bulletin of the Seismological Society of America, August 1, 1977; 67(4): 1091 - 1098. [Abstract] [PDF]

				C. H. CRAMER, C. G. BUFE, and P. W. MORRISON P-wave travel-time variations before the August 1, 1975 Oroville, California earthquake Bulletin of the Seismological Society of America, February 1, 1977; 67(1): 9 - 26. [Abstract] [PDF]

				R. ROBINSON and H. M. IYER Temporal and spatial variations of travel-time residuals in central California for Novaya Zemlya events Bulletin of the Seismological Society of America, October 1, 1976; 66(5): 1733 - 1747. [Abstract] [PDF]

				M. FEVES and G. SIMMONS Effects of stress on cracks in Westerly granite Bulletin of the Seismological Society of America, October 1, 1976; 66(5): 1755 - 1765. [Abstract] [PDF]

				M. WYSS Local changes of sea level before large earthquakes in South America Bulletin of the Seismological Society of America, June 1, 1976; 66(3): 903 - 914. [Abstract] [PDF]

				R. H. SIBSON, J. Mc. M. MOORE, and A. H. RANKIN Seismic pumping--a hydrothermal fluid transport mechanism Journal of the Geological Society, December 1, 1975; 131(6): 653 - 659. [Abstract] [PDF]

				I. N. GUPTA Premonitory changes in ts/tp due to anisotropy and migration of hypocenters Bulletin of the Seismological Society of America, October 1, 1975; 65(5): 1487 - 1493. [Abstract] [PDF]

				I. N. GUPTA Premonitory seismic-wave phenomena before earthquakes near Fairview Peak, Nevada Bulletin of the Seismological Society of America, April 1, 1975; 65(2): 425 - 437. [Abstract] [PDF]

				D. T. Griggs, D. T. Griggs, D. D. Jackson, L. Knopoff, and R. L. Shreve Earthquake Prediction: Modeling the Anomalous Vp/Vs Source Region Science, February 14, 1975; 187(4176): 537 - 539. [Abstract] [PDF]

				M. J. S. Johnston, M. J. S. Johnston, and C. E. Mortensen Tilt Precursors before Earthquakes on the San Andreas Fault, California Science, December 13, 1974; 186(4168): 1031 - 1034. [Abstract] [PDF]

				I. N. GUPTA Dilatancy and spatial distribution of aftershocks Bulletin of the Seismological Society of America, December 1, 1974; 64(6): 1707 - 1713. [Abstract] [PDF]

				D. J. SUTTON A fall in P-wave velocity before the Gisborne, New Zealand, earthquake of 1966 Bulletin of the Seismological Society of America, October 1, 1974; 64(5): 1501 - 1507. [Abstract] [PDF]

				A. McGarr and A. McGarr Earthquake Prediction: Absence of a Precursive Change in Seismic Velocities before a Tremor of Magnitude 3frac34 Science, September 20, 1974; 185(4156): 1047 - 1049. [Abstract] [PDF]

				R. Robinson, R. Robinson, R. L. Wesson, and W. L. Ellsworth Variation of P-Wave Velocity before the Bear Valley, California, Earthquake of 24 February 1972 Science, June 21, 1974; 184(4143): 1281 - 1283. [Abstract] [PDF]

				T. V. MCEVILLY and L. R. JOHNSON Stability of P an S velocities from Central California quarry blasts Bulletin of the Seismological Society of America, April 1, 1974; 64(2): 343 - 353. [Abstract] [PDF]

				I. N. Gupta Premonitory Variations in S-Wave Velocity Anisotropy before Earthquakes in Nevada Science, December 14, 1973; 182(4117): 1129 - 1132. [Abstract] [PDF]

				T. V. McEvilly, T. V. Mcevilly, and L. R. Johnson Earthquakes of Strike-Slip Type in Central California: Evidence on the Question of Dilatancy Science, November 9, 1973; 182(4112): 581 - 584. [Abstract] [PDF]

				C. H. Scholz, C. H. Scholz, L. R. Sykes, and Y. P. Aggarwal Earthquake Prediction: A Physical Basis Science, August 31, 1973; 181(4102): 803 - 810. [PDF]

				I. N. GUPTA Dilatancy and premonitory variations of P, S travel times Bulletin of the Seismological Society of America, June 1, 1973; 63(3): 1157 - 1161. [Abstract] [PDF]

				A. L. Hammong and A. L. Hammond Earthquake Predictions: Breakthrough in Theoretical Insight? Science, May 25, 1973; 180(4088): 851 - 853. [PDF]

				J. H. Whitcomb, J. H. Whitcomb, J. D. Garmany, and D. L. Anderson Earthquake Prediction: Variation of Seismic Velocities before the San Francisco Earthquake Science, May 11, 1973; 180(4086): 632 - 635. [Abstract] [PDF]