DOI: 10.1785/bssa0620051217. Dilatancy, pore fluids, and premonitory variations of <i>ts/tp</i> travel times

Dilatancy, pore fluids, and premonitory variations of ts/tp travel times

10.1785/bssa0620051217

Crossref journal-article

Seismological Society of America (SSA)

Bulletin of the Seismological Society of America (790)

Abstract

Abstract Nerseov et al. (1969) found that the travel-time ratio of shear and compressional waves, ξ = ts/tp varies prior to the occurrence of earthquakes in the Garm region, USSR. Laboratory results indicate that the decrease of ξ can result from dilatancy of rocks around the focal zone. The subsequent increase of ξ, 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.

Bibliography

Nur, A. (1972). Dilatancy, pore fluids, and premonitory variations of ts/tp travel times. Bulletin of the Seismological Society of America, 62(5), 1217â1222.

Authors 1

Amos Nur (first)

References 13 Referenced 429

10.1029/JZ065i004p01083 / J. Geophys. Res. / The velocity of compressional waves in rocks to 10 kb, Part I by Birch ((1960))
10.1029/JZ066i007p02199 / Geophys. Res. / The velocity of compressional waves in rocks to 10 kb, Part II by Birch ((1961))
10.1029/JZ071i016p03939 / J. Geophys. Res. / Dilatancy in the fracture of crystalline rocks by Brace ((1966))
10.1785/BSSA0590010043 / Bull. Seism. Soc. Am. / Investigation of a method for determining stress accumulation at depth, 2 by Eisler ((1969))
10.1029/RG003i004p00485 / Rev. Geophys. / On dilatancy in relation to seismic sources by Frank ((1965))
{'key': '2021091018460439100_BIB6', 'article-title': 'Space-time distribution of the travel time ratios of transverse and longitudinal waves in the Garm area', 'author': 'Nersesov', 'year': '(1969)', 'journal-title': 'The Physical Basis of Foreshocks'} / The Physical Basis of Foreshocks / Space-time distribution of the travel time ratios of transverse and longitudinal waves in the Garm area by Nersesov ((1969))
10.1016/0012-821X(69)90035-1 / Earth Planet. Sci. Lett. / The effect of saturation on velocity in low porosity rocks by Nur ((1969))
10.1029/JB076i008p02022 / J. Geophys. Res. / Effects of stress on velocity anisotropy in rocks with cracks by Nur ((1971))
{'key': '2021091018460439100_BIB9', 'article-title': 'A note on effective pressure', 'author': 'Robin', 'year': '(1972)', 'journal-title': 'J. Geophys. Res.'} / J. Geophys. Res. / A note on effective pressure by Robin ((1972))
10.1016/0040-1951(68)90023-1 / Tectonophysics / On the prediction of earthquakes by Savarensky ((1968))
{'key': '2021091018460439100_BIB11', 'first-page': '245', 'article-title': 'Variations in the travel time of transverse and longitudinal waves before violent earthquakes', 'volume': '3', 'author': 'Semenov', 'year': '(1969)', 'journal-title': 'Bull. Acad. Sci. USSR, Phys. Solid Earth'} / Bull. Acad. Sci. USSR, Phys. Solid Earth / Variations in the travel time of transverse and longitudinal waves before violent earthquakes by Semenov ((1969))
10.1029/JZ069i006p01123 / J. Geophys. Res. / Velocity of shear waves in rocks to 10 kb, Part I by Simmons ((1964))
10.1029/TR038i001p00089 / Trans. Amer. Geophys. Union / Anisotropy in rocks under simple compression by Tocher ((1957))

Dates

Type	When
Created	3 years, 11 months ago (Sept. 10, 2021, 2:46 p.m.)
Deposited	3 years, 11 months ago (Sept. 10, 2021, 2:46 p.m.)
Indexed	1 month, 3 weeks ago (July 7, 2025, 2:03 a.m.)
Issued	52 years, 10 months ago (Oct. 1, 1972)
Published	52 years, 10 months ago (Oct. 1, 1972)
Published Online	52 years, 10 months ago (Oct. 1, 1972)
Published Print	52 years, 10 months ago (Oct. 1, 1972)

Funders 0

None

BibTeX

@article{Nur_1972, title={Dilatancy, pore fluids, and premonitory variations of ts/tp travel times}, volume={62}, ISSN={0037-1106}, url={http://dx.doi.org/10.1785/bssa0620051217}, DOI={10.1785/bssa0620051217}, number={5}, journal={Bulletin of the Seismological Society of America}, publisher={Seismological Society of America (SSA)}, author={Nur, Amos}, year={1972}, month=oct, pages={1217–1222} }

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