郭晓, 张元生, 魏从信, 钟美娇, 张璇. 2013: 芦山MS7.0地震长波辐射异常现象. 地震学报, 35(5): 731-737. DOI: 10.3969/j.issn.0253-3782.2013.05.0011
引用本文: 郭晓, 张元生, 魏从信, 钟美娇, 张璇. 2013: 芦山MS7.0地震长波辐射异常现象. 地震学报, 35(5): 731-737. DOI: 10.3969/j.issn.0253-3782.2013.05.0011
Guo Xiao, Zhang Yuansheng, Wei Congxin, Zhong Meijiao, Zhang Xuan. 2013: OLR anomalies for the Lushan MS7.0 earthquake. Acta Seismologica Sinica, 35(5): 731-737. DOI: 10.3969/j.issn.0253-3782.2013.05.0011
Citation: Guo Xiao, Zhang Yuansheng, Wei Congxin, Zhong Meijiao, Zhang Xuan. 2013: OLR anomalies for the Lushan MS7.0 earthquake. Acta Seismologica Sinica, 35(5): 731-737. DOI: 10.3969/j.issn.0253-3782.2013.05.0011

芦山MS7.0地震长波辐射异常现象

OLR anomalies for the Lushan MS7.0 earthquake

  • 摘要: 以静止卫星长波辐射资料为数据源, 应用功率谱相对变化法对芦山MS7.0地震进行分析研究. 结果表明, 芦山地震前在龙门山断裂带上及其西北地区出现了明显的长波辐射功率谱信息异常现象, 芦山地震发生在功率谱增强范围区的边缘. 临震时功率谱相对变化率幅值达到近几年来的相对极值, 约为平均值的8倍, 功率谱幅值(相对变化率)大于平均值2倍的持续时间约为65天, 功率谱幅值最大时大于平均值6倍的异常面积达12万km2. 短临异常信息表现特征与之前的中国大陆MS≥6.5地震研究结果基本一致. 强震长波辐射功率谱信息特征幅值极值、 功率谱增强持续时间等短临异常特征识别较为容易, 且长波辐射资料可实时更新, 未来可将其应用于监测地震重点危险区, 特别是监测能力较差的强震多发区.

     

    Abstract: Based on the outgoing long-wave radiation data of geostationary satellite, the relative variance rate of power spectrum estimation is applied to analytical study of OLR for the Lushan MS7.0 earthquake on 20 April 2013. The results indicate that the power spectrum anomalies of OLR arose significantly before the Lushan earthquake. The earthquake happened in the edge of the power spectrum enhancement areas.On short-impending period of the earthquake, power spectrum amplitude of OLR reached relative maximum in recent years, being eight times as large as average values. The duration of power spectrum amplitude (viz. relative change rate more than twice of average) was about 65 days. The extreme areas for power spectrum enhancement amplitude (viz. relative change rate more than 6 times) reached 120 thousand square kilometers. The short-impending anomaly distribution of this earthquake is basically consistent with the previous results of MS≥6.5 earthquakes in Chinese mainland. The characteristics of observed thermal-radiating anomalies are easy to be recognized, and the outgoing long-wave radiation data can be updated in real time. Therefore, it is able to be used to monitor the key earthquake hazardous areas, specially the frequent strong earthquake zone with the worse seismic-monitoring capability.

     

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