气候变化领域集成服务门户(CCPortal): Hydrothermal anomalies of the Earth's surface and crustal seismicity related to Ms8.0 Wenchuan EQ

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DOI	10.1007/s11069-020-04263-7
	Hydrothermal anomalies of the Earth's surface and crustal seismicity related to Ms8.0 Wenchuan EQ
	Zheng S.; Qin K.; Wu L.; An Y.; Yin Q.; Lai C.
发表日期	2020
ISSN	0921030X
起始页码	2097
结束页码	2114
卷号	104 期号:3
英文摘要	Hydrothermal anomalies related to the Ms8.0 Wenchuan earthquake (EQ) on May 12, 2009, have been widely reported. However, the reported anomalies have not been associated with multi-geosphere analysis, and space–time analysis with crustal seismicity is lacking. In this paper, the space–time variation of hydrothermal parameters, including soil moisture, soil temperature, near-surface relative humidity (RHsig995) and air temperature (TMPsfc), was first extracted and analyzed with the NCEP-FNL reanalysis dataset. The b-value (a seismic parameter from the Gutenberg–Richter law) was calculated and mapped to unravel the crustal stress and rock rupture. Our results reveal a similar time window for hydrothermal anomalies on April 20 and April 30, 2008, and these anomalies are mainly distributed along the southern and middle parts of the Longmenshan fault zone. The surface temperature anomalies lag behind the humidity anomalies, and the accelerating stress accumulation started since June 2007 and lasted for eight to nine months before the mainshock. The b-value mapping shows a segmented difference along strike of the Longmenshan fault, and that regional stress accumulated mainly in the southern parts of the F2 and F3 faults. We propose the occurrence of a complex coupling process led by crustal stress buildup before the Wenchuan EQ. The anomalies are concentrated in the southern part of the surface rupture zone. The prolonged crustal stress accumulation corresponds to the short intermittent hydrothermal response on the Earth’s surface before the Wenchuan EQ. Our findings reveal new hydrothermal anomalies in the Earth’s surface and atmosphere and explore direct link with seismogenic processes in the crust. © 2020, The Author(s).
关键词	b-value Hydrothermal anomalies Seismicity Wenchuan earthquake
英文关键词	crustal structure; earthquake magnitude; earthquake mechanism; fault zone; hydrothermal alteration; relative humidity; seismic hazard; seismicity; Sichuan earthquake 2008; soil moisture; spatiotemporal analysis; stress field; structural geology; tectonic setting; temperature anomaly; China; Sichuan; Wenchuan
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206055
作者单位	School of Resources and Environmental Engineering, Anhui University, Hefei, China; School of Earth and Space Science, University of Science and Technology of China, Hefei, China; China University of Mining and Technology, Xuzhou, China; Central South University, Changsha, China; Faculty of Science, University of Brunei Darussalam, Gadong, BE1410, Brunei Darussalam
推荐引用方式 GB/T 7714	Zheng S.,Qin K.,Wu L.,et al. Hydrothermal anomalies of the Earth's surface and crustal seismicity related to Ms8.0 Wenchuan EQ[J],2020,104(3).
APA	Zheng S.,Qin K.,Wu L.,An Y.,Yin Q.,&Lai C..(2020).Hydrothermal anomalies of the Earth's surface and crustal seismicity related to Ms8.0 Wenchuan EQ.Natural Hazards,104(3).
MLA	Zheng S.,et al."Hydrothermal anomalies of the Earth's surface and crustal seismicity related to Ms8.0 Wenchuan EQ".Natural Hazards 104.3(2020).