Investigation of the Earthquake Prediction by the observation of Groundwater Radon Concentration at the Kamioka Mine, Gifu Prefecture

岐阜县神冈矿山地下水氡浓度观测地震预测研究

基本信息

批准号：
09440104
负责人：
TASAKA Shigeki
金额：
$ 10.43万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440104/
关键词：
Radon Groundwater Radon Concentration Earthquake Prediction Groundwater Flow rate Groundwater Temperature Radon Detector Active Fault World Wide Web 地震地震前兆現象温泉湯量温泉泉温潮汐現象ラドン観測システム地震の前兆現象

项目摘要

Gifu prefecture is located in the middle of Japan, and there are many active faults. We have carried out continuous monitoring of radon concentration, water flow rate, water temperature at 20 wells. We observed groundwater at the Wariishi hot spring, Kamioka, Gifu Prefecture. We made clear the relationship between the change of groundwater flow and the occurrence of earthquakes by using geological method. The average of radon concentration of the Wariishi hot spring was 2.54Bq/l with a liquid scintillation method. It is obvious from the analysis of the water flow rate using the BAYTAP-G that the water flow rate at the Wariishi hot spring has periodic fluctuations mainly induced by the Earth's tides. The water temperature went down by about 1 degree at the Wariishi hot spring eight hours before the series of earthquakes at the Nagano and Gifu boundary. And there was co-seismic phenomena at the Wariishi hot spring, where the water temperature went up about 1.5degrees, and the water flow rate increased by 79 liters per minute, from 57 liters per minute, after the Hida region Earthquake which had a magnitude of 5.4. The magnitude M is related to the distance Δ from the epicenter. As a result of the change of the water flow rate, when the three earthquakes, each of which had a magnitude of more than 6.6, and this earthquke occurred, the equality Mc ≧ 2.3log Δ +1.5 arose. Consequently the analysis of water flow rate demonstrated that the phase of KィイD21ィエD2, amplitude of OィイD21ィエD2 and KィイD21ィエD2 changed after this earthquake.

岐阜县位于日本中部，活动断层较多。我们对岐阜县神冈市瓦石温泉的20口井进行了氡气浓度、水流量、水温的连续监测。利用地质方法明确了地下水流量变化与地震发生之间的关系，瓦石温泉的氡气浓度平均值为2.54Bq/l。使用BAYTAP-G对水流量进行液体闪烁法分析可以明显看出，瓦石温泉的水流量存在周期性波动，主要是由地球潮汐引起的，水温下降了约1度。长野县和岐阜县边界发生一系列地震前八小时，瓦石温泉出现了同震现象，水温上升了约100%。 1.5 度，水流量从每分钟 57 升增加到 5.4 级飞弹地区地震后，震级 M 与距震中的距离 Δ 有关。水流量的变化，当发生3次6.6级以上地震，且发生本次地震时，等式Mc≥2.3log Δ+1.5出现，检查水流量分析表明KD21D2的相位、OD21D2和KD21D2的振幅在这次地震后发生了变化。