Some recent studies on groundwater radon content as an earthquake precursor
Some recent studies on groundwater radon content as an earthquake precursor
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DOI：
10.1029/jb085ib06p03089
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发表时间：
1980-06
影响因子：
--
通讯作者：
T. Teng
中科院分区：
文献类型：
--
作者：
T. Teng
本文综述了近年来地下水氡含量与地震活动关系的一些研究。介绍了中国和日本的结果，包括实验室实验和地下水氡连续监测系统的开发。此外，自1974年以来，在南加州大学（USC）进行的地下水氡监测研究的一些细节。南加州大学的项目包括一个地下水氡监测网络，该网络由14个位于冷泉、温泉、深层灌溉威尔斯和自流威尔斯的采样点组成，这些采样点分布沿着加利福尼亚州从戈尔曼到圣贝纳迪诺的圣安德烈亚斯断层的“锁定”延伸段。每周从这些网站的样本中的氡含量进行分析，精度为百分之几。附近地区尚未发生过中大地震，结果显示氡异常与小震（M103）没有明显的联系，无法提供更好的测试条件。与俄罗斯早期报告显示地震发生前氡排放长期积累相反，中国和日本最近的几份报告显示，地下水氡异常持续时间很短，仅在主震前几天内发生。通过使用连续监测系统，可以观察这些影响。总的来说，现有数据表明，地下水氡监测有时可以提供前兆信息。然而，尚未制定选择取样地点和取样频率的标准。
Some recent studies of groundwater radon content in relation to seismic activities are reviewed. Results from China and Japan are presented, including laboratory experiments and the development of continuous groundwater radon monitoring systems. In addition, groundwater radon monitoring studies conducted at the University of Southern California (USC) since 1974 are presented in some detail. The USC project includes a groundwater radon monitoring network of 14 sampling sites at cold springs, hot springs, deep irrigation wells, and artesian wells that are distributed along a ‘locked’ stretch of the San Andreas fault from Gorman to San Bernardino in California. Radon contents in weekly samples from these sites are analyzed to the precision of a few percent. No moderate-to-large earthquake has yet occurred in the vicinity, and the results show no clear association of radon anomalies with small (M ∼ 3) earthquakes to provide better test conditions. In contrast to earlier reports from Russia showing a long-term buildup of radon emission before earthquake occurrence, several recent reports from China and Japan show that groundwater radon anomalies can be short in duration and occur only within a few days before the main shocks. Observations of such effects are made possible with the use of continuous monitoring systems. In general, available data suggest that groundwater radon monitoring could sometimes yield precursor information. However, criteria have yet to be established by which sampling sites and sampling frequencies are selected.