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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.
In order to study the relationship between the seismic activity and the temporal and spatial evolution of atmospheric methane concentration, taking the Lushan M_S7.0 earthquake as an example, based on the methane data obtained by the satellite atmospheric infrared detector (AIRS) mounted on the polar satellite AQUA, Value method to extract methane column concentration information, vertical concentration profile information and long-term sequence change information before and after the earthquake to excavate the temporal and spatial evolution characteristics of methane anomalies before and after the Lushan earthquake.The results show that there is The obvious methane concentration increased; the temporal-spatial evolution trend of methane concentration was initial discharge → surge proliferation → convergence increased → relatively weakened → emission after quake → recovered calm; the concentration of methane column in the epicenter before the earthquake was the concentration of methane column in the region from January 2008 to August 2016 Therefore, it is considered that the increase of methane emission before M_S7.0 Lushan earthquake could be the precursor of the earthquake.