富士山直下の低周波地震活動は2000年秋になぜ活発化したか?

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タイトル別名
  • Why Did the Activity of Low-Frequency Earthquakes below Mt. Fuji Increase Remarkably in the Fall of 2000?
  • フジサン チョッカ ノ テイシュウハ ジシン カツドウ ワ 2000ネン アキ ニ ナゼ カッパツカ シタ カ

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抄録

Areal strain increased noticeably in the region around the northern boundary of the Izu Peninsula in September to December 2000 when a lot of low-frequency earthquakes occurred beneath Mt. Fuji. In the same time the seismic activity in eastern Yamanashi Prefecture became low. Since increase of the areal strain indicates reduction of the pushing force of the colliding Izu block, the decrease of seismicity in eastern Yamanashi Prefecture is easily understood. Further, because diminution of the tectonic stress beneath Mt. Fuji implies reduction of the confining pressure in the magma reservoir, we think it is probable that degassing took place in the magma to build up high pressure in the focal region near the chamber which caused the remarkable activity of the low-frequency earthquakes. We suggest the noticeable increase of the areal strain in late 2000 might be produced by a mechanical separation of the Izu block from the Philippine Sea plate or detachment of the crust of the Izu block as proposed by Seno (2005).

収録刊行物

  • 地震　第２輯

    地震　第２輯 58 (4), 401-406, 2006

    公益社団法人 日本地震学会

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