Microearthquake observations around Thien Dam in northwest Himalayas

Details Microearthquake observations around Thien Dam in northwest Himalayas Microearthquake observations around Thien Dam in northwest Himalayas

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...44..169b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 44, Issue 2, p. 169-178.

Physics

Scientific paper

A microearthquake survey has been conducted around Thien Dam (32°26.5'N, 75°43.5'E) during March-April 1983 by operating seven high gain stations. The data recorded at these stations have been supplemented by other seismological stations in the region under the Beas and Salal Projects. Surficial velocity structure has been obtained from waves generated from blasts in the dam area and hypocentres were determined using the program HYPO 71.
Microearthquake distribution shows four main zones of active seismicity. Deeper microearthquakes with focal depths greater than 10 km below the dam were attributed to the Satlitta fault. Composite focal mechanism solution shows that the Satlitta fault at this depth is of normal type. Shallow microearthquakes below the dam are due to the Suruin-Mastgarh anticline which is of the thrust type. Microearthquakes located northeast of the dam are apparently associated with a `back' thrust.

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