Medium Wave Infrared Brightness Anomalies of Wenchuan 8.0 and Zhongba 6.8 Earthquakes
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摘要: 本文以静止卫星中波红外亮温为数据源,应用小波变换和计算功率谱方法对汶川8.0级地震和仲巴6.8级地震进行了分析研究。结果表明,这两次地震震前均出现了明显的短临热异常现象。这与长波辐射通量和热红外亮温资料的研究结果基本一致。在时间演化过程中热异常现象在震前存在一次明显的变化,这种变化有短临预测意义。地震前后热异常分布可能反映了区域应力集中和调整变化,根据异常的演化方向和异常消失区域可以估计发震的可能区域范围。Abstract: Based on the Medium Wave Infrared Brightness data of geostationary satellite, the authors applied wavelet transform and power spectrum estimation to an analytical study of thermal anomalies for Wenchuan 8.0 and Zhongba 6.8 earthquakes. The results indicate that short-term and impending thermal anomaly phenomena arose distinctly before the two earthquakes. The short-impending anomaly distributions of both earthquakes were basically consistent with the previous results of outgoing long-wave radiation and thermal infrared brightness temperature data studies. The obvious change of thermal anomaly before the two earthquakes in the time evolution has the short-term and impending significance of earthquake forecast prediction. The thermal anomalies of the two earthquakes might have reflected the changes in stress concentration and adjustment. The authors estimated the possible earthquake region according to the direction of abnormal evolution and the anomaly disappearance of the seismogenic zone.
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Key words:
- earthquake /
- wavelet transform /
- power spectrum /
- thermal anomaly
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