LIU Lei1 , DU Jian-guo1, FU Bi-hong2, XIE Chao1, DA Jie3, ZHI Mei3, ZHOU Xiao-cheng1, CHEN Zhi1, SHI Pi-long2, CUI Yue-jü1, LI Jing4
1. Institute of Earthquake Science, CEA, Beij ing 100036, China; 2. Institute of Geology and Geophysics, CAS, Beijing 100029, China;
3. Yushu Earthquake Administration of Yushu state, Yushu 815000 China; 4. Institute of Disaster Prevention, Yanjiao , Hebei 065201, China
Abstract: To understand the earthquake fault geodynamic characteristics and the relationship between seismic activity and fault gas, soil gas geochemistry methods were used to investigate the surface rupture and the concentrations of Rn and Hg in the fault zone, which is a co-seismic fault of Yushu Ms 7.1 earthquake, April 14th, 2010, nearby the Ganda village, Yushu. The average concentrations of Rn and Hg in soils collected nearby the Ganda village fault zone were 9246 Bq/ m3 and 4. 2 ng/ m3 , respectively. Soil gas escaping after the surface rupture generated a low concentrat ion of Rn around the major slip plane of the fault. The concentration increasing of Rn in spring before Yushu earthquake indicated increasing of fault activities. The heterogeneously extruding of Bayankela plate from west caused the left-lateral slip of the Ganzi-Yushu fault. The deep gas escaped to the surface during earthquake rupture resulted in concentration increasing of Ra and Hg in the fault zone.
Key words: fault gas; Rn and Hg; surface rupture; Ms7.1 Yushu earthquake
Bulletin of Mineralogy, Petrology and Geochemistry Vol. 30, No.2, 2011, page 129-134
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