云南几次中强地震热红外异常特征对比研究

doi:10.7517/issn.1674-0475.181101

摘要/Abstract

摘要： 云南省位于多个地块交界处，构造活动活跃且地震活动频发。利用中国静止气象卫星风云二号系列相当黑体温度TBB数据，应用小波变换和相对傅氏功率谱的时频相对功率谱方法（T-F RPS），提取并分析了云南省2008年至今发生的5.5级以上地震热红外异常信息，且对比分析了特征周期、特征幅值、异常形态、异常演化过程等参数。结果表明：（1）该系列地震热红外异常信息易于用时频相对功率谱方法（T-F RPS）提取识别，且异常特征具有"出现-扩大-减小-消失"的规律；（2）异常特征周期和持续时间也具有一定的规律性；（3）异常沿着断层延展，震中位于异常边缘一侧或者异常区域交汇地带，发震时刻多位于相对功率谱幅值下降阶段；（4）震级与相对功率谱峰值有一定的相关性，震级高，峰值也较高；（5）地震类型与异常面积有一定的相关性，双震型地震异常面积较大。此外，讨论了地震热红外异常与构造活动、气候状况、天气情况和季节等因素的关系。

关键词: 云南地震, 相对功率谱, 热红外异常特征, 对比分析

Abstract: Yunnan province is located at the block boundaries, with active tectonic activity and frequent seismic activity.After using the "time-frequency relative power spectrum" (T-F RPS) method based on Chinese Geostationary Meteorological Satellite infrared remote sensing brightness temperature data processing, we rapidly and accurately extracted and identified pre-earthquake thermal infrared anomalies information of earthquakes above Ms 5.5 since 2008 in Yunnan Province.The parameters such as feature period, feature amplitude, abnormal form and abnormal evolution process are compared and analyzed. The results show that:(1) we can extract and identify seismic thermal infrared anomaly information by time-frequency relative power spectrum method(T-F RPS).The abnormal features obey the rule of "occurred-expand-recede-disappeared". (2) The characteristic period and duration of anomaly have some regularity. (3) The abnormal expand along the fault, and the epicenter is located on the side of the abnormal edge or at the intersection of the abnormal area. The origin time is mostly in the decreasing phase of relative power spectrum. (4) The magnitude is correlated with the peak of relative power spectrum. The higher the magnitude, the higher the value. (5) There is a certain correlation between the type of earthquake and the abnormal area. The anomaly area of double-seismic is large. In addition, we also discuss the relationship between thermal infrared anomalies of earthquakes and tectonic activities, climatic conditions, weather conditions and seasons.

Key words: earthquakes in Yunnan, relative power spectrum, thermal infrared anomaly features, relative ana-lysis

王莹, 张元生, 魏从信. 云南几次中强地震热红外异常特征对比研究[J]. 影像科学与光化学, 2019, 37(3): 215-226.

WANG Ying, ZHANG Yuansheng, WEI Congxin. Comparative Study on Thermal Infrared Anomaly Characteristics of Several Moderate and Strong Earthquakes in Yunnan Province[J]. Imaging Science and Photochemistry, 2019, 37(3): 215-226.

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