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Science 9 November 1973:
Vol. 182. no. 4112, pp. 581 - 584
DOI: 10.1126/science.182.4112.581
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Articles

Earthquakes of Strike-Slip Type in Central California: Evidence on the Question of Dilatancy

T. V. Mcevilly 1 and L. R. Johnson 1

1 Seismographic Station, Department of Geology and Geophysics, University of California, Berkeley 94720

The travel times of compressional waves from quarry explosions of well-known origin times, measured at the University of California network of seismographic stations for the period 1961 to the present, have been examined for evidence of premonitory changes prior to earthquakes of moderate magnitudes in the region. Velocities to seven station sites are generally constant to within ± 1 percent, with occasional deviations of ± 2 percent. Variations seem to bear no correlation to earthquake occurrence and are probably due to a combination of reading errors and changes in the source location within the quarry.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Temporal stability of P-velocity anisotropy before earthquakes in central California.
J. A. STEPPE, W. H. BAKUN, and C. G. BUFE (1977)
Bulletin of the Seismological Society of America 67, 1075-1090
   Abstract »    PDF »
Variation of P-wave velocity before and after the Galway Lake earthquake (ML = 5.2) and the Goat Mountain earthquakes (ML = 4.7, 4.7), 1975, in the Mojave desert, California.
H. KANAMORI and G. FUIS (1976)
Bulletin of the Seismological Society of America 66, 2017-2037
   Abstract »    PDF »
A search for travel-time changes associated with the Parkfield, California, earthquake of 1966.
D. M. BOORE, A. G. LINDH, T. V. MCEVILLY, and W. W. TOLMACHOFF (1975)
Bulletin of the Seismological Society of America 65, 1407-1418
   Abstract »    PDF »
Stability of P an S velocities from Central California quarry blasts.
T. V. MCEVILLY and L. R. JOHNSON (1974)
Bulletin of the Seismological Society of America 64, 343-353
   Abstract »    PDF »


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