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Wakita et al. 1991

Wakita, H., Igarashi, G. and Notsu, K. (1991). An anomalous radon decrease in groundwater prior to an M6.0 earthquake: A possible precursor?. Geophysical Research Letters 18: doi: 10.1029/91GL00824. issn: 0094-8276.

A significant decrease in the radon concentration of artesian groundwater was observed at a well-established observation site in Northeast Japan about two days before an M 6.0 earthquake occurred about 200 km from the site. On the basis of a concurrent in situ (-126 m) temperature drop of the groundwater, we infer that precursory changes in regional stress were locally amplified near this site and resulted in the temporary mixing of cooler, radon-poor groundwater into the normal artesian flow. ¿ American Geophysical Union 1991

BACKGROUND DATA FILES

	Abstract

Keywords
Seismology, Earthquake prediction, Hydrology, Groundwater, Seismology, Seismicity

Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/

Publisher
American Geophysical Union
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