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

التفاصيل البيبلوغرافية
العنوان: Tsunami Induced by the Strike‐Slip Fault of the 2018 Palu Earthquake (Mw = 7.5), Sulawesi Island, Indonesia
المؤلفون: Tung‐Cheng Ho, Kenji Satake, Shingo Watada, Ming‐Che Hsieh, Ray Y. Chuang, Yosuke Aoki, Iyan E. Mulia, Aditya Riadi Gusman, Chih‐Heng Lu
المصدر: Earth and Space Science, Vol 8, Iss 6, Pp n/a-n/a (2021)
بيانات النشر: American Geophysical Union (AGU), 2021.
سنة النشر: 2021
المجموعة: LCC:Astronomy
LCC:Geology
مصطلحات موضوعية: Palu, tsunami, inversion, strike‐slip, SAR, teleseismic, Astronomy, QB1-991, Geology, QE1-996.5
الوصف: Abstract 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.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2333-5084
Relation: https://doaj.org/toc/2333-5084
DOI: 10.1029/2020EA001400
URL الوصول: https://doaj.org/article/512ff19f86504181aa1b7ae84be9830c
رقم الأكسشن: edsdoj.512ff19f86504181aa1b7ae84be9830c
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:23335084
DOI:10.1029/2020EA001400