Abstract
Geochemical observation for earthquake prediction in Japan is centered on continuous monitoring of radon concentration in groundwater. The monitoring is conducted at 25 observation sites distributed mainly in the areas facing the Pacific Ocean by several organizations. Observed changes in radon concentration are interpreted to be caused by changes in meteorological conditions, tidal motions and pumping rates, and by seismic events. Temporal variation patterns of radon records observed in a certain region are similar to one another and differ among different areas. An apparent similarity is observed between regional patterns of radon records and those of volumetric strainmeter records, which may imply that radon changes reflect changes in regional stress fields. Anomalous changes in radon concentration recently observed are discussed in connection with local seismic events.
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