2008年新疆于田M_(S)7.3地震前后CH_(4)和CO异常研究  

CH_(4)and CO gas anomalies before and after the 2008 Yutian M_(S)7.3 earthquake in Xinjang

作　　者：梁浩东 辛存林[1] 刘海博 施紫越 LIANG Hao-dong;XIN Cun-lin;LIU Hai-bo;SHI Zi-yue(College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China;School of Earth Sciences,Zhejiang University,Hangzhou 310000,China;School of Earth Sciences,Chengdu University of Technology,Chengdu 610000,China)

机构地区：[1]西北师范大学地理与环境科学学院,兰州730070 [2]浙江大学地球科学学院,杭州310000 [3]成都理工大学地球科学学院,成都610000

出　　处：《兰州大学学报（自然科学版）》2023年第2期196-204,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金面上项目(41972020)。

摘　　要：为了探究地震前后气体变化特征,使用差值法和异常指数法分析基于AIRS传感器提取的2008年新疆于田M_(S)7.3地震前后的CH_(4)和CO数据.结果表明,CH_(4)和CO气体柱浓度异常均出现在震前的2月且CO柱浓度变化早于CH_(4);空间上,CH_(4)气体柱浓度异常沿康西瓦断裂-玉龙喀什断裂呈环状近东西向分布,CO气体柱浓度异常呈双环状分布,其中一个环带呈北西西向延伸,延伸方向与铁克里克断裂走向一致,另一个环带沿阿尔金断裂呈近东西向延伸.与本次地震有关的CH_(4)和CO异常应该是地震引起的地下气体沿断裂带逸散所致.CH.和CO柱浓度变化在地震活动期间呈显著负相关(R=-0.726),表明与CH_(4)和CO有关的化学变化可能是气体浓度异常的另一个原因.The anomaly variations of CH and CO concentrations extracted form AIRS data via the difference method and anomaly index method before and after the 2008 Yutian M_(S)7.3 earthquake in Xinjiang were discussed.The results showed that the concentration anomalies of CHy and CO both occurred in February before the earthquake and the concentration changes in CO were earlier than CH.Spatially,the concentration anomalies of CH_(4)were distributed along the Kangxiwa fault-Yulong Kashi fault in a bicyclic shape,extending east-westward,whilst the concentration anomalies of CO extended in the direction of northwest by west,which was consistent with the trend of the Iron Creek fault.The variations of CH4 and CO volume mixing ratio values at different heights were consistent with those obtained by the difference method and the anomaly index method.The CH_(4)and CO anomalies should have been caused by underground gas escaping along the fault zone caused by the earthquake.The concentration changes of CH_(4)and CO were significantly negatively correlated during earthquake activities(R=-0.726),indicating that the chemical transformation between CH_(4)and CO might be another cause behind the gas anomalies.

关 键 词：CO CH_(4) 地震 新疆于田 

分 类 号：P315.72[天文地球—地震学]