Earthquake Prediction Study by Geochemical Methods in Greece

据报道，希腊物理学家小组通过电磁观测成功地预测了地震的发生。而在日本、中国和俄罗斯，地下水在地震前或地震时的异常情况经常被观察到。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，并明确地震前兆的机制。1998年，我们在Atalanti 2号井（111米深，66-105米深）安装了连续的Rn监测系统，该井位于1893年5月23日（6.3级）和1894年4月27日（7.2级）发生大地震的Atalanti活动断层，造成大量人员伤亡。我们的系统包括一个从地下水中提取可溶性气体的水气分离器模块，一个卢卡斯细胞连接的闪烁计数器用于测量Rn和一个记录仪。1999年，我们在Atalanti 3号井（150米深，102-132米死角）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，沿着Atalanti断层。这个系统有时不能工作，这是由于Lucas细胞及其周围管道中的冷凝水造成的。因此，我们在1999年3月在所有系统中安装了水分离装置。在我们的观测期间，在1998年10月16日、12月16日和12月21日，在Atalanti 2井记录了可能与附近2.8-3.2级小尺度地震有关的氡浓度变化。我们还对发生火山地震的尼西罗斯火山的火山气体温度进行了连续测量。此外，从俯冲构造的角度研究了该区地下水和深部天然气的化学和同位素特征。

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.