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Titolo:
THE GREAT KURILE EARTHQUAKE OF OCTOBER 4, 1994 TORE THE SLAB
Autore:
TANIOKA Y; RUFF L; SATAKE K;
Indirizzi:
UNIV MICHIGAN,DEPT GEOL SCI ANN ARBOR MI 48109
Titolo Testata:
Geophysical research letters
fascicolo: 13, volume: 22, anno: 1995,
pagine: 1661 - 1664
SICI:
0094-8276(1995)22:13<1661:TGKEOO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
INVERSION; JAPAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
Y. Tanioka et al., "THE GREAT KURILE EARTHQUAKE OF OCTOBER 4, 1994 TORE THE SLAB", Geophysical research letters, 22(13), 1995, pp. 1661-1664

Abstract

The fault geometry, depth, and slip distribution of the Kurile earthquake of Oct. 4, 1994 are estimated using seismic waveforms, aftershockdistribution, geodetic measurements, and tsunami waveforms. Previous large earthquakes in the Kurile are had typical underthrusting focal mechanisms due to the local subduction. Seismic wave inversions of the 1994 event indicate a thrust type mechanism with a large strike-slip component. This does not represent an underthrust event at the subduction interface. The focal depth is estimated at 50 km, just beneath the previously estimated subduction interface. We calculate crustal deformation and tsunami waveforms from the two possible fault planes of the focal mechanism solution and find that both fault planes explain the observations. We choose the north-south striking plane, because of the occurrence of a large (Mw 7.8) intermediate-depth earthquake on Dec. 6, 1978, northwest of the 1994 rupture area. The lineation of aftershock distributions of these two events suggests that both earthquakes were due to a tearing of the slab perpendicular to the trench. The joint inversion of geodetic and tsunami data shows that the largest slip, about 17 m, occurred at the upper end of the slab.

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Documento generato il 06/04/20 alle ore 07:51:04