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The application of geochemical methods in earthquake prediction in China
Author(s) -
Fongliang Jiang,
Guiru Li
Publication year - 1981
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl008i005p00469
Subject(s) - radon , groundwater , geology , term (time) , seismology , aftershock , earthquake prediction , china , environmental science , geotechnical engineering , geography , physics , quantum mechanics , archaeology
Several geochemical anomalies were observed before the Haichen, Longling, Tangshan, and Songpan earthquakes and their strong aftershocks. They included changes in groundwater radon levels; chemical composition of the groundwater (concentration of Ca ++ , Mg ++ , Cl − , SO 4 = and HCO 3 − ions); conductivity; and dissolved gases such as H 2 , CO 2 , etc. In addition, anomalous changes in water color and quality were observed before these large earthquakes. Before some events gases escaped from the surface, and there were reports of "ground odors" being smelled by local residents. The large amount of radon data can be grouped into long‐term and short‐term anomalies. The long‐term anomalies have a radon emission build up time of from a few months to more than a year. The short‐term anomalies have durations from a few hours or less to a few months.