2014年鲁甸M_S6.5、景谷M_S6.6地震前的长波辐射异常特征

The Outgoing Long Wave Radiation Anomalous Features of the M_S6.5 Ludian and M_S6.6 Jinggu Earthquakes in 2014

为了研究2014年鲁甸M_S6.5、景谷M_S6.6地震前的长波辐射变化特征,应用功率谱相对变化法,以风云气象卫星长波辐射资料为基础数据,对上述2次地震进行了分析。结果显示:2次地震前短期内均存在明显的长波辐射相对功率谱异常变化,异常特征展布的边缘及走向与断层密切相关,震前短期内地震当年功率谱明显偏离其背景值及标准差,偏离持续时间约2个月,最大偏离差在7倍以上。2014年云南地区的这2次6级以上地震所表现出的长波辐射时空异常特征明显,易于识别,可为长波辐射资料用于该地区的地震监测提供震例经验。

This paper aims at analyzing the outgoing long wave radiation anomalies of the MS6.5 Ludian and Ms6.6 Jinggu earthquakes in Yunnan Province,using the outgoing long wave date comes from meteorological satellite FY-2 E and by the method of relative power spectrum. The result shows that there obviously exist relative power spectrum anomalies of outgoing long wave in the short term before the two earthquakes. The edge and direction of anomalous characteristics are closely related to the faults. The relative power spectrum of the two earthquakes distinctly deviates from its annual average and standard deviation. The persistent deviation period is about two months and the maximum deviation is over seven times. The time-spatial characteristics of relative power spectrum for the two earthquakes are obvious and easy to identify. It can also provide references for earthquake prediction in this regions by using outgoing long wave radiation data.