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Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake
http://hdl.handle.net/2241/00160334
http://hdl.handle.net/2241/0016033490cbd030-0498-4b81-8e08-1524ffbc17d8
名前 / ファイル | ライセンス | アクション |
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EPSL_547-116449 (7.2 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2020-07-17 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題 | 2018 Palu earthquake | |||||
キーワード | ||||||
主題 | kinematic source inversion | |||||
キーワード | ||||||
主題 | complex fault geometry | |||||
キーワード | ||||||
主題 | supershear rupture | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
奥脇, 亮
× 奥脇, 亮× 八木, 勇治× HIRANO, Shiro× SHIMIZU, Kousuke |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | How does fault slip follow an earthquake rupture front propagating faster than the local shear-wave velocity (i.e., at supershear speed)? How does a supershear rupture front pass through a geometrically complex fault system? Resolving the evolution of such complex earthquake ruptures is fundamental to our understanding of earthquake-source physics, but these events have not been well captured by conventional waveform inversions of observational data. We applied a new framework of finite-fault inversion to globally observed teleseismic waveforms and resolved both the spatiotemporal evolution of slip and the fault geometry of the 2018 Palu earthquake (moment magnitude 7.6) in Sulawesi, Indonesia. We show that supershear rupture propagation for this event was sustained by transient slip stagnation and advancement as the rupture front passed through the geometrically complex fault system. This peculiar inchworm-like slip evolution was caused by the rupture front encountering fault bends with favorable and unfavorable orientations for rupture propagation. Our analysis also identified the possible existence of a fault junction beneath Palu Bay connecting an unmapped primary fault in northern Sulawesi with the Palu-Koro fault in the south. | |||||
書誌情報 |
en : Earth and Planetary Science Letters 巻 547, 発行日 2020-10-01 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0012-821X | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1016/j.epsl.2020.116449 | |||||
権利 | ||||||
権利情報 | © 2020 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||
著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | Elsevier |