2014年10月7日云南景谷MS6.6地震热红外异常

Thermal Infrared Anomaly Occurring before the Jinggu, Yunnan MS6.6 Earthquake on October 7, 2014

摘要:

以中国静止气象卫星FY-2C/2E红外遥感资料为依据,采用小波变换与功率谱相对变化法对2014年10月7日云南景谷M_S6.6地震进行震例数据处理和分析。结果显示:震前热异常具有明显时空特征,2014年8月上旬震中及其周围区域出现热红外异常,异常区范围随时间逐渐扩大、幅度陡增;8月30日左右异常面积达到最大,异常持续时间近一个月,异常幅度最大值达到平均值的14倍多,最大值45天后发生地震;该次地震热红外异常特征显著,容易识别,可作为一种识别地震热异常信息的判据,进一步验证卫星热红外异常在地震预判方面的作用。

Abstract:

To analyze the thermal infrared anomaly occurring before the Jinggu, Yunnan M_S6.6 earthquake in China on October 7, 2014, remotely sensed infrared brightness temperature data obtained from the Chinese geostationary meteorological satellite FY-2C/2E is used for analysis. The wavelet transform is used to determine variations and progression of changes in the power spectrum. Thermal infrared anomalies are analyzed using a temporal evolution diagram of the earthquake and a timing curve of the average brightness temperature. Processing and analysis results show that in early August 2014, thermal anomalies occurring before the earthquake had obvious spatial and temporal characteristics. The epicenter and its surrounding area show thermal infrared anomalies that spread over time in a certain direction throughout the tectonic stress field with a sharp increase in the amplitude. On around August 30th, the anomalous amplitude reached a maximum, which persisted for almost one month at a maximum value of more than 14 times the average. The earthquake occurred 45 days after the appearance of the maximum value. Case analysis and history determines that the abnormal thermal evolution firstly appeared, enhanced before shrinking, and finally disappeared. The results of this study are consistent with those of other earthquakes and are considered to be related to the geological structure and underground environment of the epicenter. This study focuses on the thermal-infrared abnormity, its evolution, and features in relation to the formation of earthquakes and delivers a new understanding of the relationship between thermal anomalies and earthquake elements. Abnormal seismic thermal infrared characteristics are noted and identified and can be used as criteria for identifying subsequent seismic thermal anomalies. The thermal infrared anomaly characteristics of this earthquake are both remarkable and easy to identify and can be used as in the recognition of seismic thermal anomalies. However, the thermal infrared anomaly characteristics also have its own short board, that is it cannot identify and judge the three elements of earthquake well. In summary, the results of this study can be used in conjunction with future studies to further validate the effect of satellite thermal infrared anomalies in the prediction of earthquakes.