Why Do Aftershocks Occur Within the Rupture Area of a Large Earthquake?
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- Suguru Yabe
- Department of Solid Earth Geochemistry Japan Agency for Marine‐Earth Science and Technology Yokosuka Japan
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- Satoshi Ide
- Department of Earth and Planetary Science University of Tokyo Tokyo Japan
書誌事項
- 公開日
- 2018-05-28
- 資源種別
- journal article
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2018gl077843
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:title>Abstract</jats:title><jats:p>The mainshock‐aftershock sequence is one of the fundamental characteristics of seismogenesis, yet the physical mechanism of aftershock generation remains poorly understood. The simple explanation that aftershocks are caused by the mainshock's redistribution of strain energy is not always applicable, especially for aftershocks within the mainshock slip area, where strain energy is released. Here we show that the genesis of aftershocks can be modeled using a frictionally heterogeneous fault system. We conducted quasi‐dynamic numerical simulations of fault rupture cycles on a finite fault governed by a rate‐ and state‐dependent friction law. Aftershocks are observed around and within the mainshock rupture area when the frictional heterogeneity varies significantly along the fault. On the other hand, aftershocks are not produced when along‐fault variations in the frictional heterogeneity are small, which mimics the observed lack of aftershocks for repeating earthquakes.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 45 (10), 4780-4787, 2018-05-28
American Geophysical Union (AGU)
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詳細情報 詳細情報について
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- CRID
- 1360004233291525504
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- ISSN
- 19448007
- 00948276
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
