摘要
以2008年3月21日Ms7.3和2014年2月12日Ms7.3于田地震为例,基于2003—2019年的MODIS LST数据,利用STL分解法、GESD检验,以震中周围区异常面积时空变化作为主要参量,探究两次于田Ms7.3震前的热红外异常时空分布特征及其识别.结果表明:①应用基于STL分解的GESD检验对研究区分析来看,震前研究区地表温度明显出现热异常现象,此方法对于地震热异常监测提供参考依据.②对于2008年3月21日地震,异常区域面积1月25日达到最大,出现异常的面积覆盖率19.5%.对于2014年2月12日地震2月10日异常最明显异常面积覆盖率达到2.1%.③研究结果可见,两次地震异常区域主要靠近震中西北及东北部.但2008年地震异常比2014年异常较明显,此研究区内异常范围较大.
Taking Ms7.3 on March 21,2008 and Ms7.3 on February 12,2014 in Yutian earthquakes as examples,based on MODIS LST data from 2003 to 2019,STL decomposition method and GESD test were used to determine the anomalies around the epicenter.The temporal and spatial changes of the area were used as the main parameter to explore the temporal and spatial distribution characteristics and identification of thermal infrared anomalies before the two Yutian Ms7.3 earthquakes.The results showed that:①The analysis of the study area using GESD inspection based on STL decomposition showed that the surface temperature of the study area before the earthquake had obvious thermal anomalies.This method provides a reference for seismic thermal anomaly monitoring.②For the earthquake on March 21,2008,the area of the anomaly area reached its maximum on January 25,and the area with anomaly coverage was 19.5%.For the February 12,2014 earthquake,the most obvious anomaly area coverage rate reached 2.1%.③The research results showed that the anomalous areas of the two earthquakes were mainly close to the northwest and northeast of the epicenter.However,the earthquake anomaly in 2008 was more obvious than that in 2014,and the anomaly range in this study area was larger.
作者
米日阿依·买土地
玉素甫江·如素力
喀迪阿依·阿力木
艾尔肯·图尔孙
MIRIAYI Maitudi;YUSUFUJIANG Rusuli;KADIAYI Alimu;AIERKEN Tuersun(Institute of Geographical Science and Tourism,Xinjiang Normal University,Urumqi 830054,China;Xinjiang Key Laboratory of Lake Environment and Resources in Arid Zone,Xinjiang Normal University,Urumqi 830054,China)
出处
《河南科学》
2021年第3期421-428,共8页
Henan Science
基金
国家自然科学基金(41764003)。
