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收集了1998年2~5月广西环江MS4.9地震震区连续的NOAA/AVHRR卫星遥感热红外资料,经过去云等数据处理,选取当地夜间时段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)在环江MS4.9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对应性。显著增温主要表现在震前半个月左右,震后温度逐步下降;(2)对地形地貌、季节性气候等非构造因子进行相关分析表明,环江MS4.9地震反映出反季节变化的震前构造“增温”信息;(3)异常升温由震中沿NW与NE向共轭断裂交叉发育,与此次环江地震NW向发震构造较为一致。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,认为此次环江MS4.9地震前热红外升温可能为震前短临异常现象。
A series of NOAA / AVHRR satellite remote sensing thermal infrared data collected from February to May 1998 in the earthquake-stricken area of the Central Huanjiang MS4.9 of Guangxi Province were collected. After data processing such as going to the cloud and selecting the thermal infrared data of the local nighttime period for surface temperature inversion, The evolution of anomalous surface temperature anomalies before and after the earthquake and their relationship with the anomalous spatial distribution and active faults. The effects of non-structural factors such as topography and seasonal climate on the geothermal anomalies are discussed. The results show that: (1) The phenomenon of thermal infrared anomaly warming occurs in the vicinity of the epicenter two months before the MS 4.8 Earthquakes in Huanjiang River, and there is a certain correspondence between the anomalous temperature increase and the time of seismogenic events. The significant temperature increase mainly occurred in about half a month before the earthquake and the temperature dropped gradually after the earthquake; (2) Correlation analysis of topography, seasonal climate and other non-structural factors showed that the earthquake of the Hull River MS4.9 reflected an anti-seasons earthquake (3) The anomalous temperature rise developed from the epicenter of the NW and NE conjugate faults, which is consistent with the NW trending seismogenic structure of the Huanjiang earthquake. Considering the effects of non-structural factors, such as topography and seasonal climate, on anomalous temperature rise, it is considered that the thermal infrared thermal warming before the MS 6.4 Guanjiang earthquake may be a short-term anomalous phenomenon before the earthquake.