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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，有许多活动断层。我们对20口井的氡浓度、水流速度和水温进行了连续监测。我们在岐阜县神冈市的瓦里石温泉观测地下水。运用地质方法，明确了地下水流变化与地震发生的关系。液体闪烁法测得瓦里石温泉氡浓度平均值为2.54Bq/l。利用BAYTAP-G对水流量进行分析可以明显看出，瓦里石温泉的水流量存在主要由地球潮汐引起的周期性波动。在长野和岐阜交界发生地震的8小时前，万里石温泉的水温下降了1度左右。此外，在日本飞驒地区发生5.4级地震后，瓦里石温泉的水温上升了1.5度左右，水流从每分钟57升增加到每分钟79升，出现了同震现象。震级M与距离震中Δ的距离有关。由于水流速率的变化，当3次震级均在6.6级以上的地震和本次地震发生时，出现了相等的Mc≧2.3log Δ +1.5。因此，水流速率分析表明，本次地震发生后，K′′′D21′′γ γ γ γ的相位、O′γ γ D21′γ γ γ的幅值和K′γ D21′γ γ的幅值发生了变化。