The Shikotan earthquake of October 4, 1994: Lithospheric earthquake

Details The Shikotan earthquake of October 4, 1994: Lithospheric earthquake The Shikotan earthquake of October 4, 1994: Lithospheric earthquake

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1025k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 9, p. 1025-1028

Mathematics

Logic

24

Earthquakes, Geological Faults, Kurile Islands, Lithosphere, Seismology, Subduction (Geology), Azimuth, Iterative Solution, Mathematical Models, Seismic Waves, Surface Waves, Waveforms

Scientific paper

Some 32 body-wave records of an M(sub a) = 8.2 earthquake were inverted to determine the rupture pattern using an iterative deconvolution method. The mechanisms of the subevents were allowed to vary during rupture. Source parameters were obtained and the mechanism was determined using long-period Love and Rayleigh waves from 14 stations. The solution for a finite source distributed over a depth range from 0 to 90 km is (strike, dip, rake) = (54 deg, 76 deg, 129 deg) with M(sub 0) = 2.3 x 10(exp 21) Nm, in good agreement with that from body waves. Referring to the extent of the aftershock area and the subevent distribution, the fault area, the average slip and the stress drop were estimated. Synthetic waveforms as well as static displacements using either the steep or the low-angle plane as the fault plane were computed. The steel-dip fault model was found to fit the data better. Results for the mechanism, large centroid depth, high stress drop strongly suggest that the 1994 Shikotan earthquake is a lithospheric earthquake: an intra-plate event that ruptures through a substantial part of the subducting oceanic lithosphere.

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