Spatio-temporal revolution characteristics of methane emission before and after the 2013 Lushan MS7.0 earthquake
-
Abstract
Taking the case of Lushan MS7.0 earthquake, the spatio-temporal evolution characteristics of methane (CH4) before and after the earthquake were studied using CH4 data got from atmospheric infrared sounder (AIRS) instrument on AQUA satellite. Total volume of CH4, CH4 vertical profiles and long-time serial variation before and after the earthquake were analyzed by the background contents difference value method. The results showed that the CH4 concentration increased significantly in the epicentral area from January to April, 2013. The evolution trend of CH4 appeared as following: initially rose→increased abruptly and diffused→accumulated and reached to maximum→relatively attenuated→degassed after earthquake→returned to normal. The anomalies of CH4 concentration observed before the earthquake have reached the maximum in epicentral area during the period from January 2008 to August 2016. The increase of CH4 concentration before the earthquake was likely to be the precursor of MS7.0 Lushan earthquake.
-
-