P-wave traveltime and crust-upper mantle velocity 1976, structure in the Indian region
P-arrival times and residuals from shallow focus earthquakes of Indian origin, as reported in the Earthquake Data Report of the United States Department of the Interior, Geological Survey (EDR-USGS), at seismological station in India have been collected and analysed. Based on the past studies a thicker two layered crust and higher P-wave velocities in each of the two layers compared to a Jeffrey-Bullen model (J-B model), which is in conformity with the traveltimity data, has been chosen for the Indian plains. A comparatively higher P-wave velocity than in the J-B model in the upper mantle down to a depth of 185 km has been interpreted. J- B model has been accepted beyond this depth.
Hypocentre location of Cachar earthquake on 30December 1984 has been obtained using this model. This has been found to be in good agreement With both those determinations by USGS and Dubeet al. (1986).
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