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[1]YAN Yucong,LIU Fengli,GUO Lishuang,et al.Hydrogeochemical Characteristics of the Hot Springs in the Longmenshan Fault Zone[J].Journal of Seismological Research,2021,44(02):170-184.

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Hydrogeochemical Characteristics of the Hot Springs in the Longmenshan Fault Zone

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 44 Number of periods: 2021 02 Page number: 170-184 Column: Public date: 2021-06-30

Title:: Hydrogeochemical Characteristics of the Hot Springs in the Longmenshan Fault Zone

Author(s):: YAN Yucong¹; LIU Fengli¹; GUO Lishuang²; ZHOU Xiaocheng¹; OUYANG Shupei¹; LI Jingchao¹; WANG Wanli¹; (1.Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)(2.National Institute of Natural Hazards,Ministry of Emergency Management,Key Laboratory of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China)

Keywords:: hot spring; hydrogeochemistry; earthquake; the Longmenshan Fault Zone

CLC:: P314.1

DOI:: -

Abstract:: Hydrogeochemical Monitoring in the regions with strong earthquake activities would facilitate the obtaining of the geochemical information about deep fluids correlated to seismic anomalies.In this paper the hydrogeochemical characteristics of 13 hot springs(wells)in the Longmenshan Fault Zone were investigated,so as to establish the hydrogeochemical cycle model of the hot springs and reveal the relationship between hydrogeochemical variations and seismic activity in the Fault Zone.The results show that:①The hot springs in the Longmenshan Fault Zone were recharged by the meteoric water at elevations ranging from 0.8 to 3.2 km.②The chemical types of the hot springs from north to south,and from west to east along the Longmenshan Fault Zone were respectively carbonic acid,sulfuric acid and chloride.Likewise,the circulation depth of spring water deepened; the water-rock reaction intensified; and enrichment factors of the trace element of the hot springs continuously increased.③After the Wenchuan M_S8.0 earthquake and the Lushan M_S7.0 earthquake,the dissolved hydrochemical composition got declining in hot springs within the epicenter of 200 kilometers,which could be the result of the permeability decrease and the attenuation of water-rock reaction inside the fault in the healing process of the Longmenshan Fault after earthquake,

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Last Update: 2021-06-30