The 2018 MW 7.5 Palu Earthquake  A Supershear Rupture Event Constrained by InSAR and Broadband Regional Seismograms

doi:10.3390/rs11111330

ISL OpenIR > 盐湖地质与环境实验室

	The 2018 MW 7.5 Palu Earthquake A Supershear Rupture Event Constrained by InSAR and Broadband Regional Seismograms
	Fang, Jin; Xu, Caijun; Wen, Yangmao; Wang, Shuai; Xu, Guangyu; Zhao, Yingwen; Yi, Lei
	2019-06-01
发表期刊	REMOTE SENSING
卷号	11 期号:11
摘要	The 28 September 2018 Mw 7.5 Palu earthquake occurred at a triple junction zone where the Philippine Sea, Australian, and Sunda plates are convergent. Here, we utilized Advanced Land Observing Satellite-2 (ALOS-2) interferometry synthetic aperture radar (InSAR) data together with broadband regional seismograms to investigate the source geometry and rupture kinematics of this earthquake. Results showed that the 2018 Palu earthquake ruptured a fault plane with a relatively steep dip angle of 85 degrees. The preferred rupture model demonstrated that the earthquake was a supershear event from early on, with an average rupture speed of 4.1 km/s, which is different from the common supershear events that typically show an initial subshear rupture. The rupture expanded rapidly (4.1 km/s) from the hypocenter and propagated bilaterally towards the north and south along the strike direction during the first 8 s, and then to the south. Four visible asperities were ruptured during the slip pulse propagation, which resulted in four significant deformation lobes in the coseismic interferogram. The maximum slip of 6.5 m was observed to the south of the city of Palu, and the total seismic moment released within 40 s was 2.64 x 10(20) Nm, which was equivalent to Mw 7.55. Our results shed some light on the transtensional tectonism in Sulawesi, given that the 2018 Palu earthquake was dominated by left-lateral strike slip (slip maxima is 6.2 m) and that some significant normal faulting components (slip maxima is 3 m) were resolved as well.
DOI	10.3390/rs11111330
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34023
专题	盐湖地质与环境实验室中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Fang, Jin,Xu, Caijun,Wen, Yangmao,et al. The 2018 MW 7.5 Palu Earthquake A Supershear Rupture Event Constrained by InSAR and Broadband Regional Seismograms[J]. REMOTE SENSING,2019,11(11).
APA	Fang, Jin.,Xu, Caijun.,Wen, Yangmao.,Wang, Shuai.,Xu, Guangyu.,...&Yi, Lei.(2019).The 2018 MW 7.5 Palu Earthquake A Supershear Rupture Event Constrained by InSAR and Broadband Regional Seismograms.REMOTE SENSING,11(11).
MLA	Fang, Jin,et al."The 2018 MW 7.5 Palu Earthquake A Supershear Rupture Event Constrained by InSAR and Broadband Regional Seismograms".REMOTE SENSING 11.11(2019).

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