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日本列島下の地殻内地震発生層の地域的変化
https://doi.org/10.15083/0000032635
https://doi.org/10.15083/0000032635ff25ca0a-85f7-46fe-8bc4-f7530263162b
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0761014.pdf (1.4 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-05-30 | |||||
| タイトル | ||||||
| タイトル | 日本列島下の地殻内地震発生層の地域的変化 | |||||
| 言語 | ja | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | seismogenic layer | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | crustal heterogeneity | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | crustal earthquakes | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | fault zones | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | seismic tomography | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | departmental bulletin paper | |||||
| ID登録 | ||||||
| ID登録 | 10.15083/0000032635 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | Lateral variations in the seismogenic layer beneath the Japan Islands | |||||
| 著者 |
越智, 富美子
× 越智, 富美子× 趙, 大鵬 |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 126466 | |||||
| 姓名 | Ochi, Fumiko | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 126467 | |||||
| 姓名 | Zhao, Dapeng | |||||
| 著者所属 | ||||||
| 著者所属 | 愛媛大学地球深部ダイナミクス研究センター | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | To better understand the earthquake dynamics of the Japan subduction zone, we investigated the lateral variations of the seismogenic layer in the crust beneath the Japan Islands using about 30,000 well-located crustal earthquakes (M 1-5). These shallow events (0-20 km depths) were selected from the Japan University Network Earthquake Catalog (1985-1993) and the aftershocks of the 1995 Kobe earthquake (M 7.2). The hypocenters were relocated precisely using a 3-D ray tracing method [Zhao et al, 1992] and a 3-D velocity model [Ochi, Asamori and Zhao, 1999]. From the hypocentral distribution of these events we estimated the depth distributions of the upper and lower boundaries and the thickness of the seismogenic layer in Japan. Then we examined the relationships among the thickness of the seismogenic layer, active faults, volcanoes, tomography, and large crustal earthquakes (M>5.7) from 1885 to 1999. We obtained the following results. (1) There are large variations in depth range and thickness of the seismogenic layer. There is a trend that large crustal earthquakes occur in areas where the seismogenic layer changes abruptly. Those areas may represent weak sections of the crust and so are subject to tectonic stress and are prone to large earthquakes. (2) The upper and lower boundaries of the seismogenic layer become shallow toward volcanoes, indicating that the seismogenic layer is controlled by the geothermal regime. (3) The seismogenic layer exhibits large variations across and along the fault zones. (4) A correlation is visible between the thickness of the seismogenic layer and seismic tomography, suggesting that tomographic images of the crust contain the effects of lateral material heterogeneities, as well as thickness changes of the seismogenic layer. These results may improve our understanding of the earthquake dynamics and contribute to the assessment and the mitigation of seismic hazards of the Japan Islands. | |||||
| 書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 76, 号 1, p. 145-153, 発行日 2001-07-25 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00408972 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00162258 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 453 | |||||
| 出版者 | ||||||
| 出版者 | 東京大学地震研究所 | |||||
| 出版者別名 | ||||||
| Earthquake Research Institute, University of Tokyo | ||||||
