应用卫星热红外资料研究江苏及邻区地震热异常变化  

Study of Thermal Anomalies of Earthquakes in Jiangsu Province and Its Adjacent Areas by Using Satellite Thermal Infrared Data

作　　者：郭瑛霞 张丽峰 郭昱琴[3] 黄浩 胡维云 李振凯[2] GUO Yingxia;ZHANG Lifeng;GUO Yuqin;HUANG Hao;HU Weiyun;LI Zhenkai(Geodynamics Field Observation and Research Station of the Qinghai Tibet Plateau,Xining 810001,China;Qinghai Earthquake Agency,Xining 810001,China;Hainan Earthquake Agency,Haikou 570203,China)

机构地区：[1]青海格尔木青藏高原内部地球动力学野外科学观测研究站,西宁810001 [2]青海省地震局,西宁810005 [3]海南省地震局,海口570203

出　　处：《华南地震》2023年第3期19-30,共12页South China Journal of Seismology

基　　金：青海格尔木青藏高原内部地球动力学野外科学观测研究站专项;2023年青海省地震局地震科学基金课题(2023A02);江苏省地震局青年科学基金(202109);2023年度震情跟踪定向工作任务(2023010114)联合资助。

摘　　要：应用地球静止气象卫星风云二号相当黑体亮温产品数据,以小波分析和相对功率谱估计方法为基础,选取主要“沿郯庐断裂带”的地震区以及江苏省以南的地震区带,提取此区域2006—2020年M_(L)≥4.3级35个地震。通过分析其热红外异常特征,结果表明:其中有18个地震存在明显的热红外异常,对比异常演化过程皆表现为:异常出现→逐渐增强持续→减弱消失,但不同地震出现异常的特征周期不同,主要以前三个周期为主,地震大多发生在异常达到峰值后三个月内,对地震发生的短期预测有一定的指示意义。异常的最大幅值与震级无正相关关系,有的幅值大震级反而较小,故从峰值方面对地震大小的判定存在困难。所得研究结果可为东部地区应用热红外资料研究地震预测提供参考。On the basis of wavelet analysis and relative power spectrum estimation method,35 earthquakes with M_(L)≥4.3 in the seismic zone along the Tanlu fault zone and the seismic zone in the south of Jiangsu Province from 2006 to 2020 are extracted based on the product data of geostationary meteorological satellite FY-2 equivalent to blackbody brightness temperature products.By analyzing the characteristics of its thermal infrared anomalies,the results show that 18 earthquakes have obvious thermal infrared anomalies,and the evolution process of the comparative anomalies is as follows:anomaly appears→gradually increases and continues→weakens and disappears.However,the characteristic periods of anomalies in different earthquakes are different,mainly in the first three periods,and most earthquakes occur within three months after the peak of the anomaly,which has certain indicative significance for the short-term prediction of earthquake occurrence.There is no positive correlation between the maximum amplitude of the anomaly and the magnitude,and some earthquakes with large amplitudes have smaller magnitudes,so it is difficult to judge the magnitude of the earthquake from the peak value.The results can provide a reference for the application of thermal infrared data in earthquake prediction in the eastern region.

关 键 词：江苏及邻区 热红外异常 小波分析 相对功率谱法 

分 类 号：P315.728[天文地球—地震学]