2015年4月15日内蒙古阿拉善左旗MS5.8地震前后CH4和CO变化  

Anomalies on the Changes of CH4 and CO related to the 15 April 2015 Alashan Zuoqi MS5.8 Earthquake in the Inner Mongolia

作　　者：李新艳 崔月菊[2] 马禾青 卫定军[2] 仵柯田[3,2] LI Xin-yan;CUI Yue-ju;MA He-qing;WEI Ding-jun;WU Ke-tian(CEA Key Laboratory of Earthquake Prediction(Institute of Earthquake Forecasting),China Earthquake Administration,Beijing 100036,China;Earthquake Agency of Ningxia Hui Autonomous Region,Yinchuan 750001,China;China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地震局地震预测重点实验室(中国地震局地震预测研究所),北京100036 [2]宁夏回族自治区地震局,宁夏银川750001 [3]中国地质大学(北京),北京100083

出　　处：《地震》2019年第4期54-62,共9页Earthquake

基　　金：中国地震局地震预测研究所基本科研业务费专项(2016IES010103);中国地震局地震科技星火计划项目(XH16040Y);国家自然科学基金项目(4137059)

摘　　要：基于卫星高光谱数据讨论鄂尔多斯西缘CH4和CO气体背景场特征和2015年4月15日内蒙古阿拉善左旗MS5.8地震前后气体异常变化。结果表明,CH4和CO气体总量在时间上均存在显著的季节变化,空间分布上受构造地质背景、地形地貌影响,高值区位于银川、吉兰泰、河套断陷盆地。2015年4月15日内蒙古阿拉善左旗MS5.8地震当月,CH4异常沿鄂尔多斯西缘断裂带呈线性展布,地震前1周左右,震中两侧油气田出现CH4异常,异常幅度达到6倍标准偏差,与地震引起附近油气田CH4逸出增加有关;CO异常空间分布与CH4基本一致,时间上滞后CH4异常1周左右,持续2周左右后消失。CH4和CO关系密切,CO异常部分源自CH4氧化。The anomalies of TotCH4 and TotCO associated with the 15 April 2015 Alashan Zuoqi MS5.8 earthquake were discussed based on the satellite hyper-spectrum data. The background in monthly and anomaly-index of TotCH4 and TotCO were calculated from AIRS standard 3 level product data in recent years(2003-2012). The results showed that the TotCH4 and TotCO backgrounds in the study area presented obviously seasonal variations in temporally. Spatially, the distributions of TotCH4 and TotCO were affected by the tectonic geological background and topographic landform. The high values of TotCH4 and TotCO were located in Yinchuan, Jilantai and Hetao fault-sinking basins. TotCH4 anomaly appeared linearly along western edge of Ordos fault in April, while TotCH4 appeared in oil-gas-bearing basins on both sides of the epicenter about 1 week before the major shock with the maximum anomaly index reached 6. TotCO anomaly appeared when and after the main shock, and lasted for two weeks. And the spatial distribution of TotCO anomaly was consistent with the CH4. There was a close relationship between CH4 and CO. The CO anomaly was partly derived from the CH4 oxidation.

关 键 词：CH4 CO 异常指数 地震 

分 类 号：P315.7[天文地球—地震学]