the 1995 Amami-Oshima-Kinkai (Kikai-jima-Kinkai) Earthquake and Its Tectonics. Aftershock Observation of the 1995 Amami-Oshima-Kinkai Earthquake Using Ocean Bottom Seismometers.

DOI Web Site 3 Citations 13 References

Bibliographic Information

Other Title
  • １９９５年奄美大島近海（喜界島近海）地震の地震活動とテクトニクス　海底地震計による１９９５年奄美大島近海地震の余震観測
  • カイテイ ジシンケイ ニヨル 1995ネン アマミ オオシマ キンカイ ジシン

Search this article

Abstract

On October 18, 1995, an earthquake with magnitude Mj 6.7 occurred in the central part of Ryukyu Arc at 28°1.7'N, 130°23.0' E and 38 km in depth. The next day, another earthquake with magnitude Mj 6.6 occurred in the same area. The hypocenter parameters were determined by Japan Meteorological Agency (J.M.A.). For the purpose of investigating the aftershock activities finely, we put an array of twenty-two ocean bottom seismometers (OBSs) covering the area of aftershocks. The OBS observation started on October 28, ten days after the occurrence of the Mj 6.7 event, and continued about four weeks.<BR>In this study, we relocated hypocenters of the aftershocks using the data of eighteen OBSs. The results give us detailed view of the hypocenter distribution as follows : <BR>Most of aftershocks occurred (1) on the fault of Mj 6.7 event, and (2) in the focal area of Mj 6.6 (October 19, 1995). Considering the distributions of (1) and (2), we identified one of the nodal planes of the CMT solutions as the fault plane of Mj 6.7 event and Mj 6.6 event. For both events, the strike is almost parallel to the trench axis. Dip angle of the Mj 6.7 event is almost vertical. Therefore, it is obvious that this event is not a low-angle thrust-type interplate earthquake but an intraplate event.

Journal

Citations (3)*help

See more

References(13)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top