1995年奄美大島近海地震余震の喜界島における強震波形のモデリング [in Japanese] Modelling of Strong Motion at Kikai Island due to Aftershocks of the 1995 Amami-Oshima-Kikai Earthquakes [in Japanese]
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Twin earthquakes (the Amami-Oshima-Kinkai Earthquakes) occurred at the southeast from Kikai Island on October 18 (<I>M</I><SUB>JMA</SUB> 6.6) and 19 (<I>M</I><SUB>JMA</SUB> 6.5), 1995. We observed the aftershocks at Kikai Island from October 21, 1995 to February 18, 1996 using the broadband strong-motion seismometer (VSE11C/12C). After all, we observed 40 events that include the second largest aftershock, the event of November 1 (<I>M</I><SUB>JMA</SUB> 5.6).<BR>In this paper we model the strong-motion records of six events among the observed aftershocks, which have large amplitudes and rather simple waveforms to estimate their focal parameters (focal depth, strike, dip, rake, seismic moment and rise time), by try and error. The results suggest the following : <BR>(1) The strikes of the mainshocks of October 18 (the first mainshock) and 19 (the second mainshock) might be about N230°E and N185°E, respectively;<BR>(2) The hypocenter of the first mainshock might locate near the north edge of the fault which was ruptured from north to south along the fault strike, while the hypocenter of the second one might locate near the south edge of the fault which was ruptured from south to north.
- J. Geogr.
J. Geogr. 106(4), 525-536, 1997-08-25
Tokyo Geographical Society