2013年芦山M_S7.0地震前后甲烷排放时空演化分析

发布时间：2018-01-30 06:25

本文关键词： 芦山地震异常遥感甲烷　出处：《地震学报》2017年03期 　论文类型：期刊论文

【摘要】：为研究地震活动与大气甲烷浓度时空演变之间的关系,以芦山M_S7.0地震为例,基于极轨卫星AQUA上搭载的卫星大气红外探测器(AIRS)获取的甲烷数据产品,通过背景值差值法对该地震前后甲烷柱浓度信息、垂直浓度廓线信息及长时间序列变化信息进行提取,挖掘芦山地震前后甲烷异常排放的时空演化特征.结果表明:2013年1—4月芦山震中区存在明显的甲烷浓度升高;甲烷浓度时空演化趋势为初始排放→激增扩散→聚敛加强→相对减弱→震后排放→回复平静;震前震中区甲烷柱浓度为该地区2008年1月—2016年8月异常最显著的时段.因此认为芦山M_S7.0地震前甲烷排放浓度升高现象或为该地震的前兆信息.
[Abstract]:In order to study the relationship between seismic activity and temporal and spatial evolution of atmospheric methane concentration, the Lushan MsS7.0 earthquake was taken as an example. Based on the methane data obtained from the satellite atmospheric infrared detector (AIRS) carried on the polar orbit satellite AQUA, the information of methane column concentration before and after the earthquake was obtained by the method of background value difference. Vertical concentration profile information and long time series change information were extracted. The temporal and spatial evolution characteristics of abnormal methane emission before and after the Lushan earthquake were excavated. The results showed that the concentration of methane increased obviously in the epicentral region of Lushan earthquake from January to April on 2013. The spatiotemporal evolution trend of methane concentration is initial emission. 鈫扨roliferation and diffusion. 鈫扐ccumulation and strengthening. 鈫扲elative weakening. 鈫扨ost-earthquake discharge. 鈫扲eturn to calm; The concentration of methane column in the epicentral region before the earthquake was the most significant period from January 2008 to August 2016. It is considered that the methane emission concentration increased before the MSP 7.0 earthquake in Lushan or before the earthquake. Omega information.
【作者单位】：南京信息工程大学大气物理学院;中国科学院遥感与数字地球研究所;中国地震台网中心;
【基金】：科技部政府间国际科技创新合作重点专项(2016YEE0122200) 四川省科技支撑计划专项(2016JZ0027) 国家自然科学基金(41471310)联合资助
【分类号】：P315.724
【正文快照】： 引言地球自内部向外不断排放气体,相应的深部流体运动为构造运动提供了重要的驱动力(杜建国等,1994;徐常芳,1997;朱永峰,1998;杜乐天,2005).构造活动使断裂地区产生微破裂,进而有利于气体逸出(King et al,2006;Voltattorni etal,2012).因此,地震活动常伴随着地球排气过程.排气

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