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- 井元 政二郎
- 国立防災科学技術センター
書誌事項
- タイトル別名
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- Temporal Change in the Magnitude-Frequency Relation for the January 1983 Izu Earthquake Swarm, Japan
- 1983ネン 1ガツ イズ グンパツ ジシン カツドウ ニ オケル キボベツ
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抄録
Hypocenters, focal mechanisms and magnitude-frequency relations were studied in detail for a swarm activity which took place off east coast of the Izu Peninsula, central Japan, in January 1983. Hypocenters were restricted in a small source volume of a few kilometers in diameter. Most of the focal plane solutions present strike-slip type with the maximum pressure axis in the NW-SE direction, that is consistent with the tectonic stress field. At the beginning of the swarm activity, b value was larger than the value before the swarm (normal value). It decreased with time corresponding to activation of seismicity. After the largest shock (MJMA=4.5), b value increased exceeding the value at the beginning, and finally it resumed the normal value. This characteristic pattern of the variation in magnitudefrequency relation is interpreted by temporal change of average stress in the focal region on the assumption that the parameter p of the ‘Go game model’ (probability that a fault rupture propagates to the adjacent zone) depends on the stress in the source area.
収録刊行物
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- 地震 第2輯
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地震 第2輯 37 (1), 13-22, 1984
公益社団法人 日本地震学会
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詳細情報 詳細情報について
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- CRID
- 1390001204303184128
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- NII論文ID
- 130006783622
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- NII書誌ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL書誌ID
- 2992179
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- データソース種別
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- JaLC
- NDL
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