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Evidence for high velocity in Koyna seismic zone from P‐wave teleseismic imaging
Author(s) -
Srinagesh D.,
Singh Sunil,
Reddy K. Srinath,
Prakasam K. S.,
Rai S. S.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl011490
Subject(s) - geology , seismology , crust , upper crust , seismic velocity , p wave , seismic wave , seismic array , inversion (geology) , wave velocity , geodesy , geophysics , petrology , tectonics , atrial fibrillation , medicine , cardiology , shear (geology)
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.