宁夏井水位记震能力变化与周边地震关系研究

doi:10.12196/j.issn.1000-3274.2021.03.010

摘要/Abstract

摘要： 通过分析宁夏地区5口井水位记录的2013—2018年对中国大陆5级以上、全球7级以上地震的同震响应, 计算了引起5口井水位同震响应地震震级与震中到观测井距离的阈值范围, 即井水位记震范围及各观测井的记震特征, 提出结合井水位记震范围与记震特征分析各井记震能力随时间变化的方法。结果表明, 引起宁夏地区井水位同震响应的地震震级和井震距确实存在某个阈值范围关系, 表示为地震能量密度, 宁夏地区约为10^-4 J·m^-3; 相较于以往判断井水位记震能力变化的方法, 该方法提高了时间分辨率; 当井水位记震能力发生变化时, 井周边发生4.5以上地震的概率较高。

关键词: 同震响应, 地震能量密度, 记震能力

Abstract: We chose 5 wells in Ningxia and analyzed the co-seismic groundwater level responses to earthquakes that above 5.0 in mainland China and 7.0 in the world between 2013 to 2018. We summarized the characteristics of each well and got two points. One is the range of earthquake recorded by well water level, it means the threshold range of magnitude and distance causing co-seismic response of well water level. The other is coseismic characteristics of each observation well. Combining with these two points, we could get co-seismic response capability of well water level change over time. The data results show that there is a well water level co-seismic threshold range of earthquake magnitude and distance in Ningxia, and expressed by seismic energy density, it is about 10^-4 J/m³. The method of combining the two points improves the time resolution, compared with the previous one, and when the water level co-seismic capacity changes, the probability of more than 4.5 earthquakes occurring in the vicinity of the well is higher.

Key words: Co-seismic groundwater level responses, Seismic energy density, Co-seismic response capability

中图分类号:

P315.7

崔瑾, 司学芸, 孙小龙, 曾宪伟, 丁风和. 宁夏井水位记震能力变化与周边地震关系研究[J]. 地震, 2021, 41(3): 131-143.

CUI Jin, SI Xue-yun, SUN Xiao-long, ZENG Xian-wei, DING Feng-he. The Relationship between the Co-seismic Response Capability of Well Water Level and the Surrounding Earthquake[J]. EARTHQUAKE, 2021, 41(3): 131-143.

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