Summary
P- andS-wave travel times of 56 shallow earthquakes with their epicentres in and around the Andaman Sea, as recorded by the Indian Seismological Observatories situated at Madras, Visakhapatnam, Calcutta and Port Blair, have been analysed statistically. The travel times from Δ=1 ° to 17 ° can be represented by one straight-line segment. When epicentres of all the earthquakes are considered, scatter in the travel-time data is greater and the corresponding apparentP- andS-wave velocities have been found to be 8.56±0.20 km/sec and 4.84±0.36 km/sec respectively. On the other hand, if epicentres of the narrow seismic zone situated along the western border of the Andaman Sea alone are considered, the apparentP- andS-wave velocities have been found to be 8.24±0.09 km/sec and 4.74±0.10 km/sec respectively. The O-JB residuals are found to be consistently negative for the second set of epicentres which is indicative of an inclined Mohorovicic discontinuity in the Bay of Bengal region.
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Prakasa Rao, T.K.S., Sundara Rao, D.S. P- andS-wave travel-time curves from andaman sea earthquakes and inferred upper mantle velocities in the bay of bengal region. PAGEOPH 112, 395–402 (1974). https://doi.org/10.1007/BF00876149
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DOI: https://doi.org/10.1007/BF00876149