AN ANOMALOUS RADON DECREASE IN GROUNDWATER PRIOR TO AN M6.0 EARTHQUAKE - A POSSIBLE PRECURSOR

被引：38
|
作者：
WAKITA, H
IGARASHI, G
NOTSU, K
机构：
[1] Laboratory for Earthquake Chemistry, Faculty of Science, University of Tokyo
来源：
GEOPHYSICAL RESEARCH LETTERS | 1991年 / 18卷 / 04期
关键词：
D O I：
10.1029/91GL00824
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
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.
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页码：629 / 632
页数：4
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