Preliminary results of seismogeochemical research in China |
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| Authors: | Li Guiru Jiang Fongliang Wang Jihua Zhang Peiren |
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| Institution: | (1) Institute of Geology, State Seismological Bureau, Beijing, China |
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| Abstract: | Several kinds of geochemical anomaly before strong earthquakes have been observed in China since 1966. They include changes in groundwater radon levels, ion content of water (Ca+2, Mg+2, Cl–, SO
4
–2
, F–), dissolved gases (H2, CO2), and gases escaping from the aeration zone through abandoned dry wells (Ar, N2, CO2). The radon anomalies may be grouped as long-term and short-term anomalies. Most of the geochemical anomalies observed are characterized by a pattern of increase. The largest amplitude recorded was 37 times the base level. Preliminary study indicates that the types of seismogeochemical anomaly observed prior to strong earthquakes depend on tectonic, geologic, lithologic, and hydrogeological conditions at the monitoring station. Results obtained from modelling experiments on the mechanisms of some anomalies are given. |
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