气候变化领域集成服务门户(CCPortal): Coulomb stress changes and secondary stress triggering during the 2003 (Mw 6.6) Bam (Iran) earthquake

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DOI	10.1016/j.tecto.2019.228304
	Coulomb stress changes and secondary stress triggering during the 2003 (Mw 6.6) Bam (Iran) earthquake
	Maleki Asayesh B.; Zafarani H.; Tatar M.
发表日期	2020
ISSN	00401951
卷号	775
英文摘要	The 26 December 2003 (Mw 6.6) Bam earthquake is one of the most destructive events in the recorded history of Iran. Good variable-slip fault models and precise aftershock data enabled us to calculate Coulomb stress changes on the surrounding faults, optimally oriented faults, and the aftershock nodal planes to learn whether they were brought closer to failure. We also test the role of secondary stress on the aftershocks triggering. Calculated stress on the surrounding faults showed that the southern part of the Gowk fault and middle part of the Dalfard and Bam faults received positive stress changes. Stress also increases at the ends of the ruptured fault plane to expand it. Our calculations showed that deeper part of the Bam fault planes received positive stress changes due to slipping on the shallow depth. It can lead to the occurrence of aftershocks and enhance the probability of large events in the future that represent a substantial remaining seismic hazard to the reconstructed city of Bam. By imparting stress on optimally oriented faults, the correlation between Coulomb stress changes and aftershock distribution is investigated. Obtained results showed good correlation between coulomb stress change and seismicity. From 331 well located aftershock hypocenters, about 270 events (>81%) are located in the positive stress changes area. The imparted stress due to the main shock and secondary aftershocks on the nodal planes of the 158 aftershocks is calculated. The results show that the imparted stress due to main shock encouraged about 60.1% of nodal planes and 77.8% of the chosen nodal planes of aftershocks and added secondary aftershock encouraged about 81.6% of chosen nodal planes. In other word by adding secondary triggering stress Coulomb Index for chosen nodal planes increased from 0.778 to 0.816 and about 80% of aftershocks receive greater positive stress changes. © 2019 Elsevier B.V.
关键词	Aftershock Bam earthquake Coulomb Index Coulomb stress change Secondary stress triggering
英文关键词	Anchorages (foundations); Earthquake effects; Aftershock; Bam earthquake; Coulomb Index; Coulomb stress changes; Secondary stress; Faulting; aftershock; Bam earthquake 2003; Coulomb criterion; earthquake magnitude; earthquake rupture; earthquake trigger; fault plane; fault slip; fault zone; seismicity; Bam; Iran; Kerman [Iran]
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207821
作者单位	International Institute of Earthquake Engineering and Seismology, Tehran, Iran
推荐引用方式 GB/T 7714	Maleki Asayesh B.,Zafarani H.,Tatar M.. Coulomb stress changes and secondary stress triggering during the 2003 (Mw 6.6) Bam (Iran) earthquake[J],2020,775.
APA	Maleki Asayesh B.,Zafarani H.,&Tatar M..(2020).Coulomb stress changes and secondary stress triggering during the 2003 (Mw 6.6) Bam (Iran) earthquake.Tectonophysics,775.
MLA	Maleki Asayesh B.,et al."Coulomb stress changes and secondary stress triggering during the 2003 (Mw 6.6) Bam (Iran) earthquake".Tectonophysics 775(2020).