TIME-VARIABLE RESPONSE CHARACTERISTICS OF GROUNDWATER RADON TO EARTHQUAKES

被引:23
作者
IGARASHI, G
TOHJIMA, Y
WAKITA, H
机构
[1] Laboratory for Earthquake Chemistry, Faculty of Science, University of Tokyo
关键词
D O I
10.1029/93GL01960
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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<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<5 earthquakes since October 1992. This enhancement of sensitivity of the coseismic radon response may be attributed to the progress of micro-crack formation in the fracture zone of the active fault, which could be related to unusual stress accumulation in the region.
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页码:1807 / 1810
页数:4
相关论文
共 12 条
[1]   GROUNDWATER RADON ANOMALIES ASSOCIATED WITH EARTHQUAKES [J].
IGARASHI, G ;
WAKITA, H .
TECTONOPHYSICS, 1990, 180 (2-4) :237-254
[2]  
Igarashi G., 1990, Tohoku Geophysical Journal, Science Reports of the Tohoku University, Fifth Series, V33, P163
[3]  
ISHIKAWA Y, 1985, GEOL DATA PROCESS, V10, P19
[4]   ABOUT THE POTENTIAL OF WELLS TO REFLECT STRESS VARIATIONS WITHIN INHOMOGENEOUS CRUST [J].
KUMPEL, HJ .
TECTONOPHYSICS, 1992, 211 (1-4) :317-336
[5]   FLUX OF GASES ACROSS AIR-SEA INTERFACE [J].
LISS, PS ;
SLATER, PG .
NATURE, 1974, 247 (5438) :181-184
[6]   TERRESTRIAL HEAT-FLOW AROUND THE ASEISMIC FRONT OF THE JAPANESE ISLAND-ARC [J].
NAKAMURA, Y ;
WAKITA, H .
TECTONOPHYSICS, 1982, 81 (1-2) :T25-T36
[7]   METHOD FOR CONTINUOUS MEASUREMENT OF RADON IN GROUNDWATER FOR EARTHQUAKE PREDICTION [J].
NOGUCHI, M ;
WAKITA, H .
JOURNAL OF GEOPHYSICAL RESEARCH, 1977, 82 (08) :1353-1357
[8]   CONTROLS ON GROUNDWATER RN-222 CONCENTRATIONS IN FRACTURED ROCK [J].
TORGERSEN, T ;
BENOIT, J ;
MACKIE, D .
GEOPHYSICAL RESEARCH LETTERS, 1990, 17 (06) :845-848
[9]   AN ANOMALOUS RADON DECREASE IN GROUNDWATER PRIOR TO AN M6.0 EARTHQUAKE - A POSSIBLE PRECURSOR [J].
WAKITA, H ;
IGARASHI, G ;
NOTSU, K .
GEOPHYSICAL RESEARCH LETTERS, 1991, 18 (04) :629-632
[10]   RADON ANOMALY - POSSIBLE PRECURSOR OF THE 1978 IZU-OSHIMA-KINKAI EARTHQUAKE [J].
WAKITA, H ;
NAKAMURA, Y ;
NOTSU, K ;
NOGUCHI, M ;
ASADA, T .
SCIENCE, 1980, 207 (4433) :882-883