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We attempt to model the GPS displacements consisting of two elements, the right-lateral relative movement at a rate of ~2cm/yr between the northeast and the southwest Japan blocks and a locking fault in the upper crust along the Niigata-Kobe tectonic line. Subtracting the block movements from the GPS displacements yields a new data set of surface displacements, for which we make a geodetic inversion to obtain a backslip model of a left-lateral normal fault with the strike direction N43°E, the dip direction of -43°, the rake angle of 124°, the depth of the lower edge of 20 km, and the slip rate of ~2.9 cm/yr. Superposing the right-lateral block movements on the displacements produced by the backslip fault model recovers the original GPS displacements and a dislocation on the backslip fault becomes zero. The backslip fault turns to be the locking fault in this final situation. This model produces a compressional stress field with the direction NW-SE and a magnitude of ~10kPa/yr at a depth range of 0~10 km, which is qualitatively consistent with the anomalous compressional stress direction in the Hida mountains obtained by focal mechanisms. 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中部地方におけるGPS変位速度場の深部定常すべり断層によるモデル化と飛騨山脈の応力場
https://doi.org/10.15083/0000032634
https://doi.org/10.15083/00000326344cf30ad5-747b-477e-b8bf-837575312a04
名前 / ファイル | ライセンス | アクション |
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ji0761013.pdf (959.8 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-30 | |||||
タイトル | ||||||
タイトル | 中部地方におけるGPS変位速度場の深部定常すべり断層によるモデル化と飛騨山脈の応力場 | |||||
言語 | ja | |||||
言語 | ||||||
言語 | jpn | |||||
キーワード | ||||||
主題 | backslip model | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | geodetic inversion | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | GPS | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Hida mountains | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | locking fault | |||||
主題Scheme | Other | |||||
キーワード | ||||||
主題 | Niigata-Kobe tectonic line | |||||
主題Scheme | Other | |||||
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 | 10.15083/0000032634 | |||||
ID登録タイプ | JaLC | |||||
その他のタイトル | ||||||
その他のタイトル | A model of Steady-state Faulting at Depths for GPS Surface Displacements and the Stress Field in the Hida Mountains in the Chubu District, Central Honshu, Japan | |||||
著者 |
中川, 靖浩
× 中川, 靖浩× 川崎, 一朗× 石崎, 泰男 |
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著者別名 | ||||||
識別子 | 126461 | |||||
識別子Scheme | WEKO | |||||
姓名 | Nakagawa, Yasuhiro | |||||
著者別名 | ||||||
識別子 | 126462 | |||||
識別子Scheme | WEKO | |||||
姓名 | Kawasaki, Ichiro | |||||
著者別名 | ||||||
識別子 | 126463 | |||||
識別子Scheme | WEKO | |||||
姓名 | Ishizaki, yasuo | |||||
著者所属 | ||||||
著者所属 | 富山大学理学部 | |||||
著者所属 | ||||||
著者所属 | 八ヶ岳南麓天文台 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Two significant tectonic features in the Chubu district, central Honshu, Japan, are the abrupt change of the GPS displacement pattern along the Niigata-Kobe tectonic line and the anomalous direction NW-SE of compressional stresses derived from earthquake mechanisms and crater alignments of Quaternary volcanos in the Hida mountains, being deviated from the average direction of WNW-ESE of the island arc scale. We attempt to model the GPS displacements consisting of two elements, the right-lateral relative movement at a rate of ~2cm/yr between the northeast and the southwest Japan blocks and a locking fault in the upper crust along the Niigata-Kobe tectonic line. Subtracting the block movements from the GPS displacements yields a new data set of surface displacements, for which we make a geodetic inversion to obtain a backslip model of a left-lateral normal fault with the strike direction N43°E, the dip direction of -43°, the rake angle of 124°, the depth of the lower edge of 20 km, and the slip rate of ~2.9 cm/yr. Superposing the right-lateral block movements on the displacements produced by the backslip fault model recovers the original GPS displacements and a dislocation on the backslip fault becomes zero. The backslip fault turns to be the locking fault in this final situation. This model produces a compressional stress field with the direction NW-SE and a magnitude of ~10kPa/yr at a depth range of 0~10 km, which is qualitatively consistent with the anomalous compressional stress direction in the Hida mountains obtained by focal mechanisms. Based on the modeling, we propose the working hypothesis that the Niigata-Kobe tectonic line currently plays the role of the plate boundary between the Okhotsk (the northeast Japan) and the Amurian plates (southwest Japan blocks), instead of the Itoigawa-Shizuoka tectonic line. | |||||
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. 135-143, 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 | 453 | |||||
主題Scheme | NDC | |||||
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 |