書誌事項
- タイトル別名
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- Generation Mechanism of the Swarm Activity Following the 2004 Sumatra-Andaman Earthquake
- 2004ネン スマトラ ・ アンダマン ジシン ニ トモナウ グンパツ ジシン カツドウ ノ ハッセイ メカニズム
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説明
A swarm activity occurred east off Nicobar Islands about a month after the 2004 Sumatra-Andaman earthquake. We discussed three issues related to the swarm activity, i.e., (1) How can the spatial distribution of strike-slip events and normal fault events be explained? (2) Why was the swarm activity triggered east off Nicobar Islands? (3) What is the mechanism of one month delay of the swarm activity? In order to address these issues, we relocated the hypocenters of the swarm activity using the Modified Joint Hypocenter Determination (MJHD) method and investigated the spatial distribution of fault plane solutions. As a result, we found that the spatial distribution of strike-slip events and normal fault events can be explained by Riedel shears in the region between West Andaman Fault (WAF) and Sumatra Fault System (SFS). We calculated the spatial pattern of the change of the Coulomb Failure Function (ΔCFF) which suggests that the swarm activity was promoted by the coseismic slip and the afterslip of the Sumatra-Andaman earthquake. One month delay of the swarm activity may be explained by the upward migration of fluid due to the change of bulk strain at the lower end of the mainshock fault.
収録刊行物
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- 地震 第２輯
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地震 第２輯 64 (1), 33-45, 2011
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
- 1390001204304686208
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- NII論文ID
- 10029579393
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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
- 024341937
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- CiNii Articles
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- 使用不可