Earthquake Prediction Study by Geochemical Methods in Greece

希腊地球化学方法地震预报研究

• 批准号: 10041108
• 负责人: NOTSU Kenji
• 金额: $ 3.46万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10041108/
• 关键词: earthquake prediction; groundwater; rador; precursor; Greece; Atalanti fault; Nysiros volcano; deep-seated gas; 活断層; 噴気; ルーカスセル

It is reported that Greek physicists group has succeeded to predict occurrences of earthquakes by means of electro-magnetic observations. While, groundwater anomalies prior to or at the time of earthquakes were often observed in Japan, China and Russia. The aim of this study is to try to detect the groundwater anomalies in Greece where the electro-magnetic anomalies appeared many times, and to make clear the mechanism of the earthquake precursors. In 1998, we we installed a continuous Rn monitoring system at Atalanti No.2 well (111m deep with a screen of 66-105m denth) along the Atalanti active fault, where big earthquakes took place on May 23, 1893 (M 6.3) and on April 27, 1894 (M 7.2) with a lot of human victims. Our system consists of a water-gas separator module to extract soluble gases from groundwater, a Lucas cell-attached scintillation counter for Rn measurement and a recorder. In 1999, we installed the same systems at Atalanti No.3 well (150m deep with a screen of 102-132m death) and at Kamena Volla (self-spouting) well, 10km and 50km west of the Atalanti No.2 well along the Atalanti fault, respectively. This system sometimes didn't work, caused by water condensation in the Lucas cell and its surrounding tubes. So, we attached a water separation apparatus in all systems in March 1999. During our observation periods, Rn concentration changes possibly associated with small scale of nearby earthquakes (M2.8-3.2) were recorded on Oct.16, Dec.16 and Dec.21, 1998, at Atalanti No.2 well. We have also carried out continuous measurement of fumarolic gas temperature at Nysiros volcano, where volcanic earthquakes were taking place. In addition, we have investigated chemical and isotope features of groundwater and deep gas in view point of subduction tectonics.

据悉，希腊物理学家小组通过电磁观测成功预测了地震的发生。而日本、中国和俄罗斯在地震前或地震时经常观察到地下水异常。这项研究的目的是试图探测多次出现电磁异常的希腊地下水异常，并阐明地震前兆的机制。 1998年，我们在阿塔兰蒂2号井（深111m，筛网深度66-105m）沿阿塔兰蒂活断层安装了Rn连续监测系统，该井曾于1893年5月23日（6.3级）和1894年4月27日（7.2级）发生大地震，造成大量人员伤亡。我们的系统由一个用于从地下水中提取可溶性气体的水气分离器模块、一个用于测量 Rn 的附有卢卡斯电池的闪烁计数器和一个记录仪组成。 1999年，我们在Atalanti 3号井（150m深，筛管深度102-132m）和Kamena Volla（自喷）井安装了相同的系统，分别位于Atalanti 2号井以西10公里和50公里处，沿Atalanti断层。该系统有时无法工作，这是由于卢卡斯池及其周围管道中的水凝结所致。因此，我们于1999年3月在所有系统中安装了分水装置。在观测期间，1998年10月16日、12月16日和12月21日，阿塔兰蒂2号井记录到可能与附近小规模地震（M2.8-3.2）有关的Rn浓度变化。我们还对正在发生火山地震的尼西罗斯火山的喷气孔气体温度进行了连续测量。此外，我们还从俯冲构造的角度研究了地下水和深层气体的化学和同位素特征。