墨西哥下加利福尼亚M_W 7.2地震前后CO遥感地球化学异常
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摘要
利用AIRS产品数据提取了2010年4月4日墨西哥下加利福尼亚MW7.2地震前后震中及其附近CO总量和CO体积混合比随时间变化的信息,讨论了CO气体地球化学变化与地震活动的关系。数据表明,下加利福尼亚地震前约一个月CO总量升高,高出前两年同期平均值2~4×1017 mole/cm2,在地震发生前后CO总量和近地表CO体积混合比有波动现象,且8日平均数据的标准偏差增大,约为非地震时段的2倍。该现象应该归因于地震孕育发生过程中地应力作用使岩石圈脱气增强、大气电磁和化学反应引起的CO含量的增加。研究结果表明利用卫星高光谱遥感数据提取与地震有关的CO气体地球化学信息,对地震监测预报有重要意义。
The variations of CO total column and the CO volume mixing ratio over time in epicenter and vicinity area of Baja California MW 7.2 earthquake(April 4th 2010,Mexico) were extracted from AIRS database;the geochemical variations of CO and earthquake activities were carefully correlated.The extracted data showed that CO total column,one month before the earthquake,increased and was higher than the corresponding mean values(2~4×1017 mole/cm2) of 2008~2009;CO total column and CO volume mixing ratio(near-surface) fluctuated and the standard deviations of 8-day average before and after the earthquake increased to as high as about 2 times of the non-seismic period.These phenomena were attributed to increasing gas leakage from the lithosphere,a result of the earthquake related stress and increasing photo-chemical reactions in the atmosphere,a result of variation of atmospheric electromagnetism related to the earthquake.The results indicate that geochemical information of CO obtained by satellite hyperspectral remote sensing can be connected with earthquake,indicating potential application in monitoring and forecasting earthquake.
引文
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