Evidence for high velocity in Koyna Seismic Zone from P-wave teleseismic imaging

Details Evidence for high velocity in Koyna Seismic Zone from P-wave teleseismic imaging Evidence for high velocity in Koyna Seismic Zone from P-wave teleseismic imaging

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2737s&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 17, p. 2737-2740

Physics

5

Seismology: Continental Crust, Seismology: Seismicity And Seismotectonics, Tectonophysics, Tectonophysics: Tomography

Scientific paper

Three-dimensional P-wave velocity structure of the crust and upper most mantle beneath the Koyna Seismic Zone (KSZ) was determined by inverting 780 P-wave teleseismic travel times recorded by a 20 station digital network. The velocity image obtained through damped least square was tested for its resolution using checkerboard approach. The results of the inversion show strong lateral velocity variations of 6% to 7% within the study region. A high velocity anomaly (2% to 5%) in the upper and lower crust beneath the KSZ is flanked by lower velocity (-2% to -5%) anomalies on either side. The correlation of high-velocity with the seismic zone suggests that the earthquakes are occurring in more rigid rocks with increasing ability to store strain energy and release it as brittle failure.

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