2020年新疆于田MS6.4地震前热红外亮温异常研究

doi:10.12196/j.issn.1000-3274.2021.02.012

摘要/Abstract

摘要： 获取了2020年4—7月新疆于田M_S6.4地震区周边约400 km范围内连续的中国气象卫星FY-2G遥感热红外资料, 选取北京时间凌晨1:00~5:00时的分钟值数据, 经过小波变换和功率谱估计法进行处理, 得到研究区地震前后相对功率谱异常演化过程, 对比分析了2019年相同频率同期的相对功率谱幅值, 并讨论了异常时间演化过程及异常空间分布特征的可能原因。结果表明: 从2020年4月初开始相对功率谱在塔里木盆地南缘出现零星高值异常, 显著特征周期为13 d; 随后, 异常面积沿着盆地边缘断裂逐渐扩大并向阿尔金南缘断裂区域扩展。 4月下旬异常区域进一步扩大并形成跨发震断裂的异常带, 异常在2020年5月下旬和6月初达到峰值; 随着地震的临近, 异常区域开始收缩, 异常幅度也开始减小, 至地震发生时震中区附近异常已经消失; 对比分析2019年同期同频率研究区的相对功率谱值后, 认为此次热红外亮温异常可能是地震前的短临异常现象。

关键词: 2020年于田M_S6.4地震, 热红外亮温, 相对功率谱异常

Abstract: We collected the thermal infrared remote sensing data of thermal infrared brightness temperature Yutian at the epicenter of M_S6.4 earthquake within a range of about 400 km from April to July in 2020, which is measured by China Geostationary Meteorological satellite FY-2G. The infrared data of the prime time from 1:00 to 5:00 local Beijing time were selected and processed by wavelet transform and power spectrum estimation method. The evolution process of relative power spectrum anomaly before and after the main shock was obtained. The relative power spectrum of the same period in 2019 was compared and analyzed. The possible mechanisms for the time evolution and spatial distribution of the anomalies are discussed. The results show that from the beginning of April 2020, sporadic high-value anomalies appeared in the southern margin of Tarim Basin, with a characteristic period of 13 days; then the anomaly area gradually expanded along the basin edge fault and extended to the southern margin of Altyn Tagh. In the end of April, the anomaly area further expanded and formed an anomaly zone across the seismogenic fault, and the anomaly reached the peak in the end of May and early June 2020.With the approach of the earthquake, the anomaly area began to shrink, and the anomaly amplitude was rapidly reduced in the area near the epicenter area and disappeared impending the main shock. After comparing and analyzing the relative power spectrum values of the same frequency study area in the same period of 2019, it is considered that the thermal infrared brightness temperature anomaly could be a short-term and impending anomaly before the earthquakes.

Key words: the 2020 Yutian M_S6.4 earthquake, Thermal infrared brightness temperature, Anomaly of relative power spectrum

中图分类号:

P315.7

张志宏, 李梦莹, 焦明若, 孙庆山, 杨士超, 孔祥瑞. 2020年新疆于田M_S6.4地震前热红外亮温异常研究[J]. 地震, 2021, 41(2): 158-169.

ZHANG Zhi-hong, LI Meng-ying, JIAO Ming-ruo, SUN Qing-shan, YANG Shi-chao, KONG Xiang-rui. Study on Thermal Infrared Brightness Temperature Anomaly before the 2020 Yutian M_S6.4 Earthquake[J]. EARTHQUAKE, 2021, 41(2): 158-169.

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