2005年7月25日黑龙江省林甸5.1级地震——地下流体前兆异常分析

Earthquake 5.1 of Lidian in Heilongjiang province on July 25 of 2005——analyses of underground fluid anomaly

分析了2005年7月25日林甸5．1级地震和2005年2月23日富裕3．7级地震前，林甸1井大地微电流、林甸04井的氦气和大庆地震台的地温异常变化。大地微电流在这2次地震前具有明显的异常变化，其异常幅度达正常背景值的10-20倍。氦气在林甸5．1级地震前具有明显前兆异常变化。

In the article, the anomalous variations of the helium content of the 4th observational well, the micro current of the-lth well in Lindian, and the water temperature at Daqing well in Heilongjiang province before the Lindian Ms 5.1 earthquake on July 25 2005 and Fuyu M 3, 7 earthquake on February 23 2005 are analyzed. The anomalous variations of microcurrent before this two earthquakes are obvious. The anomalous amplitude is 10-20 times higher than that of ordinary background. And the helium content anomaly before the Lindian Ms 5.1 earthquake is also notable.