DOI: 10.1007/s11069-020-04263-7
论文题名: Hydrothermal anomalies of the Earth's surface and crustal seismicity related to Ms8.0 Wenchuan EQ
作者: Zheng S. ; Qin K. ; Wu L. ; An Y. ; Yin Q. ; Lai C.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2020
卷: 104, 期: 3 起始页码: 2097
结束页码: 2114
语种: 英语
中文关键词: 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
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168854
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Natural Hazards,2020-01-01,104(3)