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[1]RUI Xuelian,YANG Yao,GUAN Zhijun,et al.Anomaly Characteristics of the Water Temperature of Maoya,Litang 51th Spring before the Mid-strong Earthquakes in the Southeastern Tibetan Plateau and Its Precursor Mechanisms[J].Journal of Seismological Research,2022,45(02):318-328.[doi:10.20015/j.cnki.ISSN1000-0666.2022.0040 ]

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Anomaly Characteristics of the Water Temperature of Maoya,Litang 51th Spring before the Mid-strong Earthquakes in the Southeastern Tibetan Plateau and Its Precursor Mechanisms

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 45 Number of periods: 2022 02 Page number: 318-328 Column: Public date: 2022-05-20

Title:: Anomaly Characteristics of the Water Temperature of Maoya,Litang 51th Spring before the Mid-strong Earthquakes in the Southeastern Tibetan Plateau and Its Precursor Mechanisms

Author(s):: RUI Xuelian¹; YANG Yao¹; 2; GUAN Zhijun¹; DU Fang¹; XUE Qiaowen³; LONG Feng¹; YANG Xing¹; YANG Peng¹; (1.Sichuan Earthquake Agency,Chengdu 610041,Sichuan,China)(2.College of Earth Science,Chengdu University of Technology,Chengdu 610041,Sichuan,China)(3.Ganzi Prefecture Emergency Management Agency,Kangding 626099,Sichuan,China)

Keywords:: Maoya; Litang 51th hot spring; water temperature anomaly; the Yangbi M_S6.4 earthquake; the Litang Fault Zone

CLC:: P315.723

DOI:: 10.20015/j.cnki.ISSN1000-0666.2022.0040

Abstract:: Based on the temperature observation data of the water in Maoya,Litang spring over the 46 years,we analyze temperature dynamic variation characteristics of Maoya,Litang spring,and anomaly characteristics before the Yangbi M_S6.4 earthquake combined with regional hydrogeology,hydrogeochemistry,meteorology data.Further on,we discuss the probable anomaly mechanism of the spring water.The results show that there are differences in the amplitude of temperature anomaly at different background temperatures.Since 2009,the hot spring has changed from a medium-high temperature to a low-temperature one,and the abnormal threshold has been reduced from the original 8 ℃ to 6 ℃.The Maoya spring is located at the junction of three active faults belonging to the Litang Fault Zone and it is characterized by deep circulation,thus spring's temperature can reflect deep crustal or mantel fluid information and is sensitive to the regional tectonic activity related to earthquakes.The observed temperature of this spring shows abnormal characteristics before mid-strong earthquakes which occurred in the southeastern Tibetan Plateau,and the dominant earthquake-prone area is the southwestern part of the Sichuan-Yunnan Block.

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Last Update: 2022-05-20