Mathematics – Logic
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2175p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 20, p. 2175-2178
Mathematics
Logic
Earthquakes, Geological Faults, Ocean Bottom, Pacific Ocean, Plates (Tectonics), Seismic Waves, Seismology, Audio Signals, Bathymeters, Depth Measurement, Japan, Northern Hemisphere, Seismograms
Scientific paper
A detailed analysis is made of an unusual North Pacific intraplate event that occurred on 7 March 1988 approximately 500 km off the coast of the Japanese island of Hokkaido. It is the largest event recorded in the seismically quiet area by nearly an order of magnitude and has an anomalous m(sub b)/M(sub S) ratio (m(sub b) = 5.8, M(sub S) = 5.1). The short-period response recorded at the Washington Regional Seismograph Network (WRSN) contains strong water-layer multiples that appear to suggest a source depth on or above the ocean floor. This can be explained, however, as the sampling o a node of the P-wave radiation pattern. The modeling of short-period seismograms recorded worldwide gives a focal mechanism with fault planes (340 deg, 69 deg, 72 deg) and (202 deg, 27 deg, 129 deg) (strike, dip, slip) and a source depth of 10 km below sea level. The observed low amplitude first arrival at WRSN and the fact that the signals observed at the other stations are modeled well indicates an almost pure double-couple source for this strong intraplate event.
Padmos L.
Vandecar John C.
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