川西温泉水温观测及其在芦山<i>M<sub>S</sub></i>7.0 地震前的异常现象

晏锐; 关致君; 刘耀炜

doi:10.11939/jass.2015.02.014

川西温泉水温观测及其在芦山M_S7.0 地震前的异常现象

doi: 10.11939/jass.2015.02.014

1.
中国北京 100045 中国地震台网中心
2.
中国成都 610041 四川省地震局
3.
中国北京 100085 中国地震局地壳应力研究所

基金项目: 国家科技支撑计划项目(2012BAK19B02-03)资助.

详细信息

中图分类号: P314.1
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出版历程
- 收稿日期: 2014-07-09
- 修回日期: 2014-11-30
- 刊出日期: 2015-03-01

Hot spring water observations and its anomalies before the Lushan M_S7.0 earthquake in the western Sichuan region

1.
China Earthquake Networks Center, Beijing 100045, China
2.
Earthquake Administration of Sichuan Province, Chengdu 610041, China
3.
Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China

摘要

摘要: 在2013年芦山M_S7.0地震震中附近流体观测点进行现场考察的基础上，本文选择川西地区观测环境较好、干扰较少的温泉水温观测资料进行回溯性分析. 结果表明，康定龙头沟和二道桥温泉、道孚龙普沟温泉、理塘毛垭温泉、泸定共和温泉水温在芦山地震前均出现不同程度的异常变化. 其主要表现为，距离震中较远的理塘毛垭温泉和道孚龙普沟温泉水温在震前2年左右出现中期尺度异常，距离震中较近的康定龙头沟和二道桥温泉水温在震前3个月内出现短期异常. 通过温泉水化学及δD-δ¹⁸O稳定同位素特征分析，认为这些温泉水具有深循环特征，能灵敏地反映地壳深部地热及构造变化信息，是芦山地震前观测到异常的可能原因. 加强对这些温泉点的观测，对区域地震预测研究具有重要的科学意义和现实意义.
- 芦山M_S7.0地震 /
- 温泉 /
- 水温 /
- 水化学
Abstract: On the basis of field survey of fluid observation sites near the epicenter of 2013 Lushan M_S7.0 earthquake, hot spring temperature data observed at the sites with better observation environment and little human disturbance in the western Sichuan Province were selected to perform retrospective analysis. The results showed that different degrees of water temperature anomalies were observed at Longtougou and Erdaoqiao sites in Kangding region, Longpugou site in Daofu county, Maoya site in Litang county, Gonghe site in Luding county before the Lushan M_S7.0 earthquake. It was mainly showed that the mid-term anomalies about two years of time scale were observed at Maoya and Longpugou hot spring sites far from the epicenter of Lushan earthquake; while the short-term anomalies within three months preceding the earthquake were observed at Longtougou and Erdaoqiao hot spring sites which were close to the earthquake epicenter. By the spring water hydrochemistry and δD-δ¹⁸O stable isotopes analysis, it was suggested that these hot spring water have deep circulation characteristics, so the temperature changes of hot spring water can sensitively reflect deep crustal information in respect of geothermal and tectonic changes, which was the possible cause for the anomalies observed at the hot spring water preceding the Lushan earthquake. It was significant for the regional earthquake prediction research to strengthen observation of these hot spring sites.
- Lushan M_S7.0 earthquake /
- hot spring /
- water temperature /
- hydrochemistry

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图 1 温泉观测异常点与芦山

Figure 1. Distribution of hot spring observation sites and the Lushan M_S7.0 earthquake epicenter

下载: 全尺寸图片幻灯片

图 2 温泉水温观测日值曲线(a)康定二道桥温泉；(b)康定龙头沟温泉；(c)道孚龙普沟温泉；(d)理塘毛垭温泉；(e)泸定共和温泉

Figure 2. Observation curves of hot spring water temperature(a)Erdaoqiao hot spring in Kangding region;(b)Longtougou hot spring in Kangding region;(c)Longpugou hot spring in Daofu county;(d)Maoya hot spring in Litang county;(e)Gonghe hot spring in Luding county

下载: 全尺寸图片幻灯片

图 3 温泉水δD-δ¹⁸O同位素(部分资料来源于李军等(1989和Chen等(2014)与西南地区大气降水线对比图(王恒纯，1991)

Figure 3. Comparison ofδD-δ¹⁸O isotopes of hot spring water(partial data were from Li et al(1989) and Chen et al，2014 and meteoricwaterline in the southwestern China(after Wang，1991)

下载: 全尺寸图片幻灯片

表 1 芦山M_S7.0地震震中附近温泉异常点观测背景与异常信息

下载: 导出CSV

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