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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

作者:: 芮雪莲¹; 杨耀¹; 2; 官致君¹; 杜方¹; 薛乔文³; 龙锋¹; 杨星¹; 杨鹏¹; (1.四川省地震局,四川成都 610041; 2.成都理工大学地球科学学院,四川成都 610041; 3.甘孜州应急管理局,四川康定 626099)

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

摘要:: 采用四川理塘毛垭51泉46年的人工观测水温数据,结合区域水文地质、水文地球化学、气象等资料,分析了水温的基本动态特征、水温异常的映震特征及其在漾濞M_S6.4地震前的异常变化,并初步讨论了异常机理。结果表明:理塘毛垭51泉水温在不同背景温度下的震前水温上升幅度指标存在差异,2009年以来温泉变为低温温泉,水温上升异常阈值由原8 ℃降低为6 ℃。理塘毛垭51泉具有深循环特征,且处于构造交汇部位,水温异常变化能够反映地壳深度热流和构造活动信息,对青藏高原东南缘中强震具有较好的预测效能,优势预测区域为川滇交界西侧。

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.