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.

据报道，希腊物理学家小组已经成功地通过电磁观测预测了地震的发生。而在日本、中国和俄罗斯，地震前或地震时经常观察到地下水异常。本研究的目的是试图探测多次出现电磁异常的希腊地区的地下水异常，弄清地震前兆的机制。1998年，我们在阿塔兰蒂活动断裂带沿着的阿塔兰蒂2号井（井深111 m，筛孔密度66- 105 m）安装了氡连续监测系统。1893年5月23日（M6.3）和1894年4月27日（M7.2）两次大地震都发生在该断裂带上，造成了大量人员伤亡。我们的系统包括一个水-气分离器模块，从地下水中提取可溶性气体，卢卡斯细胞附加的闪烁计数器测量Rn和记录仪。1999年，我们在阿塔兰蒂3号井（150米深，筛管直径为102- 132米）和Kamena Volla（自喷）井（分别位于阿塔兰蒂断层沿着阿塔兰蒂2号井以西10公里和50公里处）安装了相同的系统。这个系统有时不起作用，这是由于卢卡斯细胞及其周围管道中的水凝结造成的。因此，我们于1999年3月在所有系统中安装了水分离装置。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号井记录到了可能与附近小规模地震（M2.8-3.2）有关的氡浓度变化。我们还在火山地震发生的Nysiros火山进行了连续的火山气体温度测量。此外，我们还从俯冲构造的角度研究了地下水和深层天然气的化学和同位素特征。