2011年3月24日缅甸孟帕亚M_(S)7.2地震热辐射异常研究

Research on Thermal Radiation Anomaly of the Mong Hpayak M_(S)7.2 Earthquake on March 24,2011

2011年3月24日缅甸孟帕亚县发生了M_(S)7.2地震,本次地震造成74人遇难,生命和财产损失惨重。为了分析缅甸M_(S)7.2地震前可能与地震有关的热红外亮温异常,收集了以震中为中心93°~101°E、17°~27°N范围内,2007年1月至2013年1月为期7年,由中国静止气象卫星FY-2G观测的地表亮温资料。应用连续小波变换方法和相对功率谱法得到了分析区域内相对能谱的时空演化过程。结果显示:从2010年9月起,震中SW方向100 km处开始出现异常,随后异常逐渐扩展,从10月上旬起,异常扩展到了震中区域,在11月5日异常区域和异常幅度达到了最大,随后12月上旬异常幅度和异常区域逐渐减小,地震发生在异常减弱的过程。由此推断,热红外亮温异常与缅甸M_(S)7.2地震是有关联的。

In this paper,the thermal infrared anomalies in Myanmar M_(S)7.2 earthquake is processed and analyzed using wavelet transform and relative power spectrum methods,based on remote sensing brightness temperature data was recorded by China Geostationary Meteorological satellite FY-2E/G.The results showed that there were obvious thermal infrared brightness temperature abnomal changes before the Myanmar M_(S) 7.2 earthquake,6 months before the earthquake,the brightness temperature anomalies began to appear on August 29,2010.With the passage of time,the anomalies gradually expanded,this abnormal area reached the maximum on September 11,and gradually shrank,then from October 7,the anomalous amplituded and spatial area gradually increased again,until on November 5 it reached its maximum,and fianlly gradually shrank and weakened.The magnitude of relative change reached more than 10 times,and abnormal duration lasted for more than 90 days,in characteristic 47-day.The thermal infrared characteristics of this earthquake are remarkable.Anomalies began to appear about 6 months before the earthquake,which was easy to identified.Therefore,we used the satellite thermal infrared remote sensing technology which provided an effective basis and reference for future earthquake monitoring and prediction.It has certain indication significance for predicting time and location of future earthquakes.