Tsunami Induced by the Strike-Slip Fault of the 2018 Palu Earthquake (Mw = 7.5), Sulawesi Island, Indonesia

Tung Cheng Ho, Kenji Satake, Shingo Watada, Ming Che Hsieh, Ray Y. Chuang, Yosuke Aoki, Iyan E. Mulia, Aditya Riadi Gusman, Chih Heng Lu

研究成果: 雜誌貢獻期刊論文同行評審

摘要

An unusual devastating tsunami occurred on September 28, 2018 after a strike-slip faulting earthquake in Sulawesi, Indonesia. The induced tsunami struck Palu city with ∼4-m flow depth. We performed two analyses to investigate the source of the tsunami. We first conducted the teleseismic source inversion and obtained the overall slip distribution of the strike-slip fault. Our tsunami simulation from the coseismic deformation of the seismically estimated strike-slip faulting produced a tsunami comparable to the leading part of the observation at Pantoloan. In order to reconstruct the detailed slip distribution on the fault plane, we then jointly utilized the tsunami waveform and Synthetic Aperture Radar (SAR) data. Because of the lack of SAR data in the bay, the tsunami data is necessary to constrain the offshore slip distribution, which directly induces the tsunami. The inverted source model shows a strike-slip fault which consists of three segments extending from the epicenter to the south of 1.4°S with two bends and two asperities around Palu city. The joint inversion model accurately reconstructs the observed surface displacements and the leading part of the tsunami waveform. Our result exhibits the significant contribution of the strike-slip faulting to the tsunami, but it also suggests additional tsunami sources, such as landslides, for the high inundations near Palu bay. The result also indicates that regional devastating tsunamis can be generated by an onshore strike-slip fault with localized large dip slip.

原文???core.languages.en_GB???
文章編號e2020EA001400
期刊Earth and Space Science
8
發行號6
DOIs
出版狀態已出版 - 6月 2021

指紋

深入研究「Tsunami Induced by the Strike-Slip Fault of the 2018 Palu Earthquake (Mw = 7.5), Sulawesi Island, Indonesia」主題。共同形成了獨特的指紋。

引用此