Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1807i&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 17, p. 1807-1810.
Physics
9
Earthquakes, Ground Water, Radon, Geochemistry, Japan, Temperature Effects
Scientific paper
A clear coseismic anomaly of groundwater radon was observed for a magnitude 5.6 earthquake that occurred on May 11, 1992. The coseismic radon anomaly was observed at a station which is located right on a major active fault in northeast Japan and about 140 km away from the hypocenter. This was the first time that an earthquake with M less than 6 had ever been accompanied by a clear radon anomaly at the station; although we had observed 12 similar coseismic radon anomalies at the station during the observation period from 1984 to 1987, all of the earthquakes that were accompanied by radon anomalies in that period had been with magnitude 6.0 and over. Surprisingly, the radon concentration has become more sensitive to show coseismic anomalies even for M less than 5 earthquakes since October 1992. This enhancement of sensitivity of the coseismic radon response may be attributed to the progress of microcrack formation in the fracture zone of the active fault, which could be related to unusual stress accumulation in the region.
Igarashi George
Tohjima Yasunori
Wakita Hiroshi
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