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Spectrum of slip behaviour in Tohoku fault zone samples at plate tectonic slip rates
http://hdl.handle.net/2241/00134950
http://hdl.handle.net/2241/001349504a3ba4e4-8342-4bd6-b60d-de7bc7ad3b13
名前 / ファイル | ライセンス | アクション |
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NG_8-11 (508.4 kB)
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Item type | Journal Article(1) | |||||
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公開日 | 2016-02-04 | |||||
タイトル | ||||||
タイトル | Spectrum of slip behaviour in Tohoku fault zone samples at plate tectonic slip rates | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Ikari, Matt J.
× Ikari, Matt J.× Ito, Yoshihiro× Ujiie, Kohtaro× Kopf, Achim J. |
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著者別名 |
氏家, 恒太郎
× 氏家, 恒太郎 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | During the 2011 Tohoku-oki earthquake, extremely extensive coseismic slip ruptured shallow parts of the Japan Trench subduction zone and breached the sea floor1, 2. This part of the subduction zone also hosts slow slip events (SSE)3, 4. The fault thus seems to have a propensity for slip instability or quasi-instability that is unexpected on the shallow portions of important fault zones. Here we use laboratory experiments to slowly shear samples of rock recovered from the Tohoku-oki earthquake fault zone as part of the Japan Trench Fast Drilling Project. We find that infrequent perturbations in rock strength appear spontaneously as long-term SSE when the samples are sheared at a constant rate of about 8.5 cm yr−1, equivalent to the plate-convergence rate. The shear strength of the rock drops by 3 to 6%, or 50 kPa to 120 kPa, over about 2 to 4 h. Slip during these events reaches peak velocities of up to 25 cm yr−1, similar to SSE observed in several circum-Pacific subduction zones. Furthermore, the sheared samples exhibit the full spectrum of fault-slip behaviours, from fast unstable slip to slow steady creep, which can explain the wide range of slip styles observed in the Japan Trench. We suggest that the occurrence of SSE at shallow depths may help identify fault segments that are frictionally unstable and susceptible to large coseismic slip propagation. | |||||
書誌情報 |
Nature geoscience 巻 8, 号 11, p. 870-874, 発行日 2015-11 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1752-0894 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA12309409 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1038/ngeo2547 | |||||
権利 | ||||||
権利情報 | © 2015 Macmillan Publishers Limited. | |||||
著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | Nature Publishing Group |