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- 西村 卓也
- 国土地理院地理地殻活動研究センター地殻変動研究室
書誌事項
- タイトル別名
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- Earthquake Triggering due to Volcanic Deformation Sources in Areas East off Ito and around the Mt. Iwate Volcano
- イトウオキ ト イワテサン ニ オケル カザンセイ リョク ゲン ニ ヨル ジシン ノ トリガリング
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抄録
A change of Coulomb Failure Stress (CFS) is commonly used to explain a mechanism of earthquake triggering due to both earthquake faulting and volcanic sources. First, we introduced crustal deformation and source model for five episodes of volcanic activities off Ito, central Japan and around the Mt. Iwate volcano, northern Japan based on dense geodetic measurements. And then, we calculated spatial distribution of a CFS change due to the estimated source models and compared the observed seismic activities.<BR>In the case of the 1998 earthquake swarm off Ito, the region where opening of dike and the largest earthquake (M5.7) increase CFS was concordant with the hypocenter distribution observed after the largest earthquake. However, the largest earthquake occurred in the area where CFS decreased.<BR>In the case of the Iwate volcano, a volcanic inflation source increased CFS by 0.33 MPa at the hypocenter of the M6.1 earthquake that occurred on September 3, 1998. The calculated CFS change is 7 % of the coseismic stress drop. The M6.1 earthquake occurred at the northern edge of the Nishine Fault found by geographical and geological studies. It suggests that the inflation promoted the rupture of a known Quaternary fault. Stress shadow caused by the M6.1 earthquake explains the observed quiescence of the seismic swarm activity west of E140.95° after the occurrence of the earthquake.
収録刊行物
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- 地学雑誌
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地学雑誌 111 (2), 166-174, 2002
公益社団法人 東京地学協会
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詳細情報 詳細情報について
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- CRID
- 1390282679207411968
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- NII論文ID
- 10008209473
- 10010520005
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- NII書誌ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL書誌ID
- 6147568
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- NDL
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