景谷6.6级地震前后MODIS卫星热红外信息分析

doi:10.3969/j.issn.0253-4967.2015.04.005

摘要/Abstract

摘要：

收集了2014年7月至2015年1月云南景谷M_S6.6地震区连续的MODIS/Terra卫星遥感热红外资料, 经过去云等数据处理, 选取观测质量最佳的北京时间凌晨4—6时的热红外数据进行地表温度反演, 分析地震前、后地表温度异常时间演化过程及其异常空间分布与活动断裂的关系, 并讨论了震区地形地貌、季节性气候等非构造因子对地温异常的影响。结果表明: 1)在景谷M_S6.6地震发生前2个月震中附近出现热红外异常增温现象, 异常增温与发震时间有一定的对应性。显著增温主要表现在震前半个月左右, 震前7d异常增温幅度达到峰值, 震后温度逐步降低, 同时景谷M_S5.8、M_S5.9强余震发生前半月也存在一定程度的异常升温; 2)与地形地貌、季节性气候等非构造因子的相关分析表明, 景谷M_S6.6地震反映出破年变的震前构造“增温”信息; 3)异常升温由震中沿SN—NE向共轭断裂交叉发育, 这与景谷M_S6.6地震区域构造应力场水平最大主应力NNE-SSW向优势分布较为一致, 充分考虑地形地貌、季节性气候等非构造因素对异常升温的影响, 认为此次景谷M_S6.6地震前热红外升温可能为震前短临异常现象。

关键词: 景谷M_S6.6地震, 地表温度, 地形地貌, 季节变化, 前兆异常

Abstract:

Continuous MODIS/Terra satellite thermal infrared remote sensing data of the Jinggu M_S6.6 earthquake area from July 2014 to January 2015 is collected, and after cloud-removing, the thermal infrared data between 5:00a.m.-7:00a.m. Beijing Time, which is the best period for observation, is selected to perform land surface temperature data retrieval and analyze the temporal evolution of land surface temperature anomalies before and after the earthquake, as well as the relationship between abnormal spatial distribution and active fault. The impacts of non-structural factors such as topography, landform and seasonal weather of the earthquake zone on land surface temperature anomalies are discussed. The result shows that: a)there was thermal infrared anomalous temperature increase appearing near the epicenter two months before the M_S6.6 Jinggu earthquake and there was a certain correspondence between the anomalous temperature increase and earthquake occurrence time. The significant temperature increase happened in the first half of the month, reached its peak 7 days before the earthquake, and dropped rapidly after the earthquake. At the same time, there was also anomalous temperature increase to a certain extent appearing about half month before the strong aftershocks of magnitude 5.8 and 5.9; b)Through the correlation analysis of non-structural factors such as topography, landform and seasonal weather of the earthquake zone, it is found that the structural "temperature increase" before the Jinggu M_S6.6 earthquake was the information indicating the anti-season change of temperature increase in the earthquake zone; c)The anomalous temperature increase was cross-developed from the epicenter along the NS-NE trending conjugate faults, which is consistent roughly with the NNE-SSW predominant direction of the maximum principal stress of the regional tectonic stress field. After full consideration of the influence of non-structural factors such as topography, landform and seasonal weather on the abnormal temperature increase, it is inferred that this thermal infrared temperature increase is possibly a short-imminent anomaly before the earthquake.

Key words: Jinggu M_S6.6 earthquake, land surface temperature, landform, seasonal variation, precursory anomalies

中图分类号:

P315.2

苗崇刚, 文翔, 周斌, 张华, 原永东, 黄惠宁. 景谷6.6级地震前后MODIS卫星热红外信息分析[J]. 地震地质, 2015, 37(4): 991-1003.

MIAO Chong-gang, WEN Xiang, ZHOU Bin, ZHANG Hua, YUAN Yong-dong, HUANG Hui-ning. analysis on modis satellite thermal infrared information before and after the jinggu m_s6.6 earthquake[J]. SEISMOLOGY AND GEOLOGY, 2015, 37(4): 991-1003.

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