三陸沖プレート沈み込み帯における不均質地殻構造と地震活動度-地震波反射強度分布と地震活動度との関係 Inhomogeneous Crustal Structure and Seismic Activity at the Plate Subduction Zone, Off Sanriku Region

この論文にアクセスする

この論文をさがす

著者

抄録

Off Sanriku region is a well known plate subduction zone, which lies on the west side of the Japan Trench. High seismic activities have been observed, but there are also low seismic activity regions. We conducted an OBS-controlled source seismic experiment across the seismic-aseismic boundary in 1996 to examine the relationship between seismic activity variation and crustal structure. A traveltime analysis using refraction and reflection waves was applied to the observed data to determine the 2D crustal structure. An amplitude analysis of reflection waves from the subducting plate boundary revealed a good correlation between acoustic-impedance (seismic reflectivity) and seismic activity; that is, high-impedance region is a low seismic region and vice versa. We propose the hypothesis that high-impedance is caused by fluid or hydrate rocks around the plate boundary, and this hypothesis explains the crustal velocity structure and the variations of observed reflection waves and seismic activities.

収録刊行物

  • 地學雜誌  

    地學雜誌 109(4), 497-505, 2000-08-25 

    Tokyo Geographical Society

参考文献:  24件

参考文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

被引用文献:  5件

被引用文献を見るにはログインが必要です。ユーザIDをお持ちでない方は新規登録してください。

各種コード

  • NII論文ID(NAID)
    10004724211
  • 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
    5467006
  • 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 
ページトップへ