Scopus记录号: 2-s2.0-85061102362
论文题名: Evidence of supershear during the 2018 magnitude 7.5 Palu earthquake from space geodesy
作者: Socquet A. ; Hollingsworth J. ; Pathier E. ; Bouchon M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2019
语种: 英语
英文摘要: A magnitude 7.5 earthquake hit the city of Palu in Sulawesi, Indonesia on 28 September 2018 at 10:02:43 (coordinated universal time). It was followed a few minutes later by a 4–7-m-high tsunami. Palu is situated in a narrow pull-apart basin surrounded by high mountains of up to 2,000 m altitude. This morphology has been created by a releasing bend in the Palu-Koro fault, a rapidly moving left-lateral strike-slip fault. Here we present observations derived from optical and radar satellite imagery that constrain the ground surface displacements associated with the earthquake in great detail. Mapping of the main rupture and associated secondary structures shows that the slip initiated on a structurally complex and previously unknown fault to the north, extended southwards over 180 km and passed through two major releasing bends. The 30 km section of the rupture south of Palu city is extremely linear, and slightly offset from the mapped geological fault at the surface. This part of the rupture accommodates a large and smooth surface slip of 4–7 m, with no shallow slip deficit. Almost no aftershock seismicity was recorded from this section of the fault. As these characteristics are similar to those from known supershear segments, we conclude that the Palu earthquake probably ruptured this segment at supershear velocities. © 2019, The Author(s), under exclusive licence to Springer Nature Limited. 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122631
Appears in Collections: 气候变化事实与影响
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作者单位: Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France
Recommended Citation:
Socquet A.,Hollingsworth J.,Pathier E.,et al. Evidence of supershear during the 2018 magnitude 7.5 Palu earthquake from space geodesy[J]. Nature Geoscience,2019-01-01