The earthquake sequence of November 1987 and March 1988 in the Gulf of Alaska: A new insight

Details The earthquake sequence of November 1987 and March 1988 in the Gulf of Alaska: A new insight The earthquake sequence of November 1987 and March 1988 in the Gulf of Alaska: A new insight

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1028q&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 9, p. 1028-1032

Mathematics

Logic

Earthquakes, Gulf Of Alaska, Seismic Energy, Tectonics, Geological Faults, P Waves, Spectrum Analysis, Subduction (Geology)

Scientific paper

Spectral analysis of P-waves was complemented with a simple technique for inverting body waves using a fixed source mechanism to reanalyze the rupture process of three large strike-slip earthquakes in the Gulf of Alaska. Results show that the Ms = 7.0 event of November 17, which can be considered to be a foreshock to the November 30 event, consisted of two pulses of large seismic moment release: the first one with a duration of approximately 15 sec coincides with those obtained by other studies; second, which occurs 20 sec after the first arrival was not previously reported. The Ms = 7.4 earthquake of november 30 is a complex event that ruptured on a fault plane trending north-south. The Ms = 7.7 shock of March 6, 1988 was a simple event along the same north-south trend south of the November events. P-wave far field spectra exhibit an omega-1 intermediate trend between the usual omega0 and omega-2 slopes. This trend is due to rupture along a long, narrow fault, so the corner frequency associated with this intermediate trend is related to the reciprocal of the rupture propagation time. It is suggested that these events were due to a tear in the Pacific plate

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