晏锐^1,2,,
田雷^2,,,
王广才¹,
钟骏²,
刘杰²,
周志华²
1. 中国地质大学(北京)水资源与环境学院, 北京 100083
2. 中国地震台网中心, 北京 100045

基金项目: 国家自然科学基金项目（U1602233，41503114）资助


详细信息

作者简介: 晏锐, 男, 1978年生, 副研究员, 主要从事地震地下流体与地震预测研究.E-mail:yanrui@seis.ac.cn

通讯作者: 田雷, 男, 助理研究员, 主要从事地震地下流体与地震预测研究.E-mail:leitian@seis.ac.cn

中图分类号: P315

收稿日期:2018-03-16
修回日期:2018-04-13
上线日期:2018-05-05

Review and statistically characteristic analysis of underground fluid anomalies prior to the 2008 Wenchuan M_S8.0 earthquake

YAN Rui^1,2,,
TIAN Lei^2,,,
WANG GuangCai¹,
ZHONG Jun²,
LIU Jie²,
ZHOU ZhiHua²
1. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
2. China Earthquake Network Center, Beijing 100045, China


More Information

Corresponding author: TIAN Lei,E-mail:leitian@seis.ac.cn

MSC: P315

--> Received Date: 16 March 2018
Revised Date: 13 April 2018
Available Online: 05 May 2018


摘要
摘要:地震地下流体在地震预测研究与震情跟踪中发挥着重要作用.本文基于中国地震地下流体前兆观测台网所涉及的资料范围，系统收集了2008年四川汶川8.0级地震的可能地下流体前兆异常，分析了这些异常的空间展布、时空演化以及形态等总体变化特征.结果表明，收集到的68项异常均位于10^-8应变量范围内，59项异常位于汶川8.0级地震3倍破裂区（约900 km）范围内，占异常总数的87%，这与国内外已发表的地下流体前兆异常空间分布范围和震级之间的关系相符，说明汶川8.0级巨大地震的前兆观测范围至少包含该地震3倍破裂尺度甚至更大；异常出现时间总体呈现出临近地震异常数量增多的特点，但异常数量并非逐渐增多，而是在震前5个月和1个月突然增多；异常形态特征复杂，水氡和水位总体呈现出趋势性异常特征，水温总体表现出短临变化特征，主要表现为震前1—3个月突升、突降或波动异常变化.此外，本文还结合国内外已发表的地震地下流体前兆异常以及地震孕育理论，讨论了异常的空间分布、时间尺度与未来震中的关系，这对深入认识地下流体前兆异常及产生机理都具有重要的现实意义和科学价值.
关键词: 汶川8.0级地震/
地震前兆/
地下流体/
地震预测

Abstract:Seismic underground fluid plays an important role in earthquake prediction research and seismic situation tracing. Based on the monitoring scope of the China earthquake underground fluid precursor observation network, underground fluid anomalies prior to the 2008 Wenchuan M_S8.0 earthquake were collected and the characteristics of spatial distribution, temporal evolution and pattern of these anomalies were analyzed. The results show that the 68 anomalies collected were all within the strain range of 10^-8, and 59 anomalies were within three times of the rupture length of the Wenchuan M_S8.0 earthquake (~900 km), accounting for 87% of the total number of anomalies. This illustrates that precursor observation range of the Wenchuan M_S8.0 earthquake was at least three times larger than that of the earthquake rupture length. Number of the anomalies increases approaching to the occurrence of earthquake. However, the number of anomalies did not increase gradually, instead increased suddenly five months and one month prior to the earthquake, respectively. The anomalies show a complex pattern. Generally, water radon and water levels are characterized by long-term variations, and the water temperature show short-term changes, including a sudden rise, sudden drop or abnormal fluctuations 1—3 months before the earthquake. In addition, we discuss the relationship among spatial and temporal scale of the anomalies and earthquake magnitude combined with the published earthquake precursor anomalies and earthquake preparation theory. It is of great significance to identifying the precursory anomalies of underground fluid and understanding the mechanism of these anomalies.
Key words:Wenchuan M_S8.0 earthquake/
Earthquake precursor/
Underground fluid/
Earthquake prediction



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