Comparison of the coseismic rupture with the aftershock distribution in the Hyuga-nada earthquakes of 1996

Details Comparison of the coseismic rupture with the aftershock distribution in the Hyuga-nada earthquakes of 1996 Comparison of the coseismic rupture with the aftershock distribution in the Hyuga-nada earthquakes of 1996

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3161y&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 20, p. 3161-3164

Physics

13

Seismology, Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Parameters

Scientific paper

On October 19, 1996, a large underthrusting earthquake (Ms=6.7), the Hyuga-nada, Japan, earthquake occurred along the southern end of Nankai trough. About two months later, a second large earthquake (Ms=6.7) occurred in the adjacent region. We study the source process of the two large earthquakes in the Hyuga-nada region and compare the coseismic rupture area with aftershock distribution. The main source parameters obtained for the first mainshock are: (strike,dip,rake)=(210°,12°,81°) the seismic moment Mo=2.3×1019Nm (Mw=6.8); the rupture area S=20×15km2, and the source duration T=17s. For the second main-shock, (strike,dip,rake)=(210°,12°,87°) the seismic moment Mo=1.5×1019Nm (Mw=6.7); the rupture area S=18×18km2, and the source duration T=15s. The coseismic rupture areas do not overlap the aftershock area, while the aftershock areas of the two main-shocks mutually overlap. This implies that the common aftershock region takes a role of barriers to dynamic rupture. It is also seen that the aftershock area expanded during the first one day.

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