断层气CO_2测点选建及观测资料在四川绵竹、雅江地震前的反映

Choosing site for gas CO_2 observation and change characters of gas CO_2 content before Mianzhu and Yajiang Earthquake

介绍了断层气CO2 测定方法及川西地区断层气CO2 观测点的选建和观测情况。初步观测结果显示 ,在1999年 9月和 11月四川绵竹两次 5 0级地震及 2 0 0 1年 2月四川雅江 5 0级地震和 6 0级地震前 ,川北和冕宁测点的断层气CO2 有很好的短期地震前兆异常显示。观测结果还表明 ,直接埋设在断层破碎带上的观测点可能比埋在第四纪松散堆积层中的观测点能更好地检测到来自地壳内部的断层气CO2 异常信息。

The method of testing the content of gas CO 2 released from a fault and sites choosing and buliding in western Sichuan regions are introduced.Primary results show that before two M 5.0 Mianzhu Earthquakes in September 1999 and two ( M 5.0 and M 6.0)Yajiang Earthquakes in February 2001,the data display the changes of gas CO 2 content.At the same time,our results show that gas CO 2 content taken from the sites near a ruptured fault display better results than that taken from the sites located in the Quaternary sedimentary faults.