Methane Concentration Responses Associated with the Seismic Activity in Atmospheric Troposphere
Wang Jie
Li Xianrui
He Chicheng
Zeng Zuoxun
Abstract：According to the characteristic periods of climate elements,component signals caused by climate and human factors are decomposed and recognized from the volume mixing ratio of methane in the troposphere,using wavelet analysis method. And then,extract the variation of methane concentration signal caused by geological activity (geological methane).On this ba-sis,analyze the relationship between the variation of geological methane concentration and seismic activity,take Longmenshan and Yushu areas for examples.The result shows that there is an obviously corresponding relationship between the variation of geological methane concentration and seismic activity.In addition,13 peak values of geological methane concentration occur-rence in Longmenshan area in 2004—2006,and 14 peaks values occurrence in Yushu area in 2004—2005.In total,21 cases (78%)of the time difference of geological methane and seismic activity peak are less than 2 months,and the time difference decrease firstly and then increase in February 2005,in these two areas.And,there is a positive correlation between geological methane concentration and seismic activity peak values in Longmenshan area.Finally,preliminary study on the source and vari-ation of geological methane,the results indicate that geological methane comes from upwelling of mantle and crust fluids,and its concentration correlated closely with the temperature and pressure of ductile rheological layer and “microcracks”and “Rup-ture chain”in mid-upper crust.
Keywords：methaneearthquaketroposphereLongmenshan
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 1677-1688 )