海底地震計による1995年奄美大島近海地震の余震観測 Aftershock Observation of the 1995 Amami-Oshima-Kinkai Earthquake Using Ocean Bottom Seismometers

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On October 18, 1995, an earthquake with magnitude <I>M</I>j 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 <I>M</I>j 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 <I>M</I>j 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 <I>M</I>j 6.7 event, and (2) in the focal area of <I>M</I>j 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 <I>M</I>j 6.7 event and <I>M</I>j 6.6 event. For both events, the strike is almost parallel to the trench axis. Dip angle of the <I>M</I>j 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.

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  • 地學雜誌  

    地學雜誌 106(4), 514-524, 1997-08-25 

    Tokyo Geographical Society

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各種コード

  • NII論文ID(NAID)
    10002236248
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    4283308
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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