飛騨地方北部特に跡津川断層付近の地震活動と発震機構

DOI HANDLE Web Site Web Site 被引用文献3件 オープンアクセス

書誌事項

タイトル別名
  • Seismicity and Focal Mechanism of Local Earthquakes along the Atotsugawa Fault and in the Northern Hida Region
  • ヒダ チホウ ホクブ トクニ アトツガワ ダンソウ フキン ノ ジシン カツド

この論文をさがす

抄録

Seismicity in the northern Hida region, Japan, has been routinely observed since May, 1977 at telemeter-network stations of the Kamitakara Geophysical Observatory, and about 1500 local shocks with magnitudes greater than 0.5 have been located. (1) The observation reveals high seismicity along the Atotsugawa fault, along the northern Japan-Alps, south of Mt. Norikura and Mt. Ontake, and near Hida-Osaka, with focal depths shallower than 20km. (2) Seismic activity along the Atotsugawa fault is high at the eastern and western portions, with an intermittent zone of low activity, extending over 70km. Epicenters are deviated about 2-3km north of the fault trace, and this deviation together with focal depth distribution suggests a slightly northwestwardd dipping fault plane. All these shocks are confined above 13km, suggesting either that the fault plane extends down to this depth, or that minor brittle fractures do not take place under the depth due to some flow propertities of rock materials there. (3) Nine shocks along the fault show focal mechanisms consistent with right-lateral strike-slip evidenced by geological and geomorphological surveys (MATSUDA, 1966). (4) Heavy damage along the fault region at the time of the 1858 Hida earthquake (M=6.9) appears to indicate that this large earthquake was caused by faulting motion of the Atotsugawa fault. Most of the present seismic activity along the fault might be associated with some readjustments of residual stresses around there.

収録刊行物

  • 地震　第２輯

    地震　第２輯 32 (3), 281-296, 1979

    公益社団法人 日本地震学会

被引用文献 (3)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ