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Coseismic surface rupture during the 2018 Mw 7.5 Palu earthquake, Sulawesi Island, Indonesia

Coseismic surface rupture during the 2018 Mw 7.5 Palu earthquake, Sulawesi Island, Indonesia
Coseismic surface rupture during the 2018 Mw 7.5 Palu earthquake, Sulawesi Island, Indonesia
Sulawesi Island is located at the triple junction between the converging Australian, Sunda, and Philippine plates. The magnitude (Mw) 7.5 Palu earthquake occurred on 28 September 2018 on Sulawesi Island and caused serious casualties. The causative fault of the Palu earthquake was the left-lateral, strike-slip Palu-Koro fault, which has a rapid slip rate. We experienced this earthquake in Palu City and conducted field investigations on coseismic surface ruptures 1 d after the earthquake. Field surveys revealed that the coseismic surface ruptures were characterized by left-lateral offset, en echelon tensional cracks, mole tracks within a narrow zone, and large areas of sand liquefaction that increased the damage and losses. We measured the coseismic displacements along surface ruptures and observed a maximum coseismic offset of ∼6.2 m. The rupture traces in the north Palu Basin near Palu City mark the previously unmapped Palu-Koro fault. Based on the field investigations, we determined the exact location of the Palu-Koro fault within the Palu Basin and found that the Palu-Koro fault zone can be divided into three branches: F1, F2, and F3, forming a typical flower structure.
0016-7606
Wu, Dengyun
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Ren, Zhikun
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Liu, Jinrui
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Chen, Jie
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Guo, Peng
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Yin, Gongming
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Ran, Hongliu
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Li, Chuanyou
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Yang, Xiaodong
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Wu, Dengyun
a1db47a5-5233-4a97-b26a-c9a9d13e1040
Ren, Zhikun
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Liu, Jinrui
7ba9519b-fcdf-4c2c-a5e7-7392c584a827
Chen, Jie
7181526d-ec25-480e-a35e-37bf4616e131
Guo, Peng
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Yin, Gongming
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Ran, Hongliu
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Li, Chuanyou
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Yang, Xiaodong
0c44aab1-3c52-4e2a-925e-565a34967c57

Wu, Dengyun, Ren, Zhikun, Liu, Jinrui, Chen, Jie, Guo, Peng, Yin, Gongming, Ran, Hongliu, Li, Chuanyou and Yang, Xiaodong (2020) Coseismic surface rupture during the 2018 Mw 7.5 Palu earthquake, Sulawesi Island, Indonesia. Geological Society of America Bulletin. (doi:10.1130/B35597.1).

Record type: Article

Abstract

Sulawesi Island is located at the triple junction between the converging Australian, Sunda, and Philippine plates. The magnitude (Mw) 7.5 Palu earthquake occurred on 28 September 2018 on Sulawesi Island and caused serious casualties. The causative fault of the Palu earthquake was the left-lateral, strike-slip Palu-Koro fault, which has a rapid slip rate. We experienced this earthquake in Palu City and conducted field investigations on coseismic surface ruptures 1 d after the earthquake. Field surveys revealed that the coseismic surface ruptures were characterized by left-lateral offset, en echelon tensional cracks, mole tracks within a narrow zone, and large areas of sand liquefaction that increased the damage and losses. We measured the coseismic displacements along surface ruptures and observed a maximum coseismic offset of ∼6.2 m. The rupture traces in the north Palu Basin near Palu City mark the previously unmapped Palu-Koro fault. Based on the field investigations, we determined the exact location of the Palu-Koro fault within the Palu Basin and found that the Palu-Koro fault zone can be divided into three branches: F1, F2, and F3, forming a typical flower structure.

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Accepted/In Press date: 23 August 2020
Published date: 28 October 2020

Identifiers

Local EPrints ID: 444980
URI: http://eprints.soton.ac.uk/id/eprint/444980
ISSN: 0016-7606
PURE UUID: 0a9b5308-f22f-4587-9442-f1c2454f450f

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Date deposited: 13 Nov 2020 17:34
Last modified: 26 Nov 2021 00:01

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Contributors

Author: Dengyun Wu
Author: Zhikun Ren
Author: Jinrui Liu
Author: Jie Chen
Author: Peng Guo
Author: Gongming Yin
Author: Hongliu Ran
Author: Chuanyou Li
Author: Xiaodong Yang

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