| 永清MS 4.3地震前永清井水温异常分析 |
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| 引用本文： | 王艳,何案华,邓卫平,戴应洪,吕文青,王会芳.永清MS 4.3地震前永清井水温异常分析[J].地震地磁观测与研究,2018,39(6):173-180. |
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| 作者姓名： | 王艳 何案华 邓卫平 戴应洪 吕文青 王会芳 |
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| 作者单位： | 1.中国河北 074211 河北省地震局保定中心台;2.中国北京 100085 中国地震局地壳应力研究所(地壳动力学实验室);3.中国北京 100085 北京市地震观测工程技术研究中心;4.中国重庆 400056 重庆市地震局 |
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| 基金项目： | 河北省地震科技星火计划面上项目（项目编号：DZ20170509048）；国家自然科学基金（项目编号：41772256）；中央级公益性科研院所基本业务专项（项目编号：ZDJ2017-25） |
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| 摘 要： | 2017年12月永清井观测温度急剧下降，采用该井水温、水位多年观测数据，从仪器测量原理及精细温度梯度测量出发，结合井孔资料，认为该变化为永清MS 4.3地震（井震距<30 km）发生前的异常信息。利用正弦累加模型计算温度异常持续时间和幅度，发现该异常变化存在2个周期：①周期42天，温度变化幅度为0.042 12℃；②周期16.77天，温度变化幅度为0.018 62℃。分析认为，区域应力状态发生变化，使含水层渗透性受到影响，从而间接影响到井下温度传感器安放处水温。地震发生后近距离观测到水温异常变化尚属首次，利用模型对变化时间与幅度进行量化提取，可为经验预报、统计预报提供经典震例。
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| 关 键 词： | 永清井 永清MS 4.3地震 水温异常 |
Analysis of the water temperature anomaly in Yongqing well before Yongqing MS 4.3 earthquake |
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| Wang Yan,He Anhua,Deng Weiping,Dai Yinghong,L&#,Wenqing,Wang Huifang.Analysis of the water temperature anomaly in Yongqing well before Yongqing MS 4.3 earthquake[J].Seismological and Geomagnetic Observation and Research,2018,39(6):173-180. |
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| Authors: | Wang Yan He Anhua Deng Weiping Dai Yinghong L&# Wenqing Wang Huifang |
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| Institution: | 1.Baoding Central Seismic Station, Hebei Earthquake Agency, Hebei Province 074211, China;2.Institute of Crustal Dynamics, China Earthquake Administration(Crustal Dynamics Laboratory), Beijing 100085, China;3.Beijing Earthquake Observation Engineering Technology Research Center, Beijing 100085, China;4.Chongqing Earthquake Agency, Chongqing 400056, China |
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| Abstract: | The pre-seismic abnormal information was found, through the multi-year observed data and the temperature gradient, in groundwater temperature of Yongqing well before Yongqing earthquake (MS 4.3, distance to epicenter<30 km). This abnormal information was the first detected in the area where close to the epicenter. The pre-seismic abnormal information presented that quickly declined from December 2017 and sustained for 40 days. Two periods were found by the sinusoidal accumulation model, one was the 42 days with amplitude of 0.042 12℃ and another was 16.77 days with amplitude of 0.018 62℃. We considered that the groundwater temperature dynamic was determined by the permeability changing, which was affected by the local stress state. This study can provide the valuable earthquake case for empirical and statistical prediction of earthquake through the computation the duration and amplitude in quantity. |
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| Keywords: | Yongqing well Yongqing MS 4 3 earthquake water temperature anomaly |
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