Focal mechanism of the 20 August, 1983, Caspian Sea earthquake

Details Focal mechanism of the 20 August, 1983, Caspian Sea earthquake Focal mechanism of the 20 August, 1983, Caspian Sea earthquake

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...55..135c&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 55, Issue 1-2, p. 135-143.

Physics

Scientific paper

The short-period array seismogram at GBA (India) of a central Caspian Sea seismic event on 20 August, 1983, was described by some workers as `explosion-like', though they finally favoured an earthquake source on focal depth and P-wave complexity/spectral criteria. We subject GBA and other array records to a quantitative test for compatibility with a double-couple source, the P:pP:sP relative amplitude method, applied in conjunction with a `moving-depth window' process to test separately a wide range of P-pP-sP times. The only sections of coda consistent with being pP and/or sP are large-amplitude arrivals, ~ 12-15 s behind P. They indicate a normal fault, striking WNW-ESE and downthrown to the north, at a depth of some 30 km; in good agreement with the trend of mapped faults and local seismicity, and focal depth derived from P onset times.
Present address: Seismograph Services Limited, Holwood, Keston, Kent BRB BJR, Gt. Britain.

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