文安地震前华北区域长波辐射场的异常特征分析
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摘要
利用NOAA/IR极轨卫星所获取并发布的热红外长波辐射(OLR)月平均网格数据信息(空间分辨率为2.5°×2.5°),采用涡度处理方法,在对华北地区OLR多年背景场分布特征分析的基础上,详细研究了2006年7月4日河北文安5.1级地震前华北地区OLR的短期异常演化特征。结果显示,华北地区OLR正常背景场变化较为平稳,但在文安地震之前这种平稳均一的分布格局发生了变化,主要表现为在地震发生之前2个月,在震中附近出现了OLR的显著增强异常现象。结合以往开展的大量的震例分析结果,显示出这种震前的异常演化特征具有广泛的普适性。这一认识的取得对于开展华北地区地震短临预报应用研究具有一定的现实意义。
An earthquake with MS5.1 occurred in Wen'an County,Hebei Province in north China,on July 4,2006.Based on monthly average Grid data with spatial resolution of 2.5°×2.5°,getting from observations of NOAA/IR polar orbit satellite in recent years,this paper analyzed the anomalous characteristics and its evolvement in time series on ambient field of OLR in north China by using Eddy covariance means before the earthquake.The research result is as follows: The change of normal ambient field is stable,the OLR value is changed with a notably anomaly two months earlier before the earthquake,and the phenomena usually happened around the epicenter.Combining previous earthquake case study by using the similar method,the characteristics of OLR anomaly before earthquake takes the catholicity.The result must have great practical significance in the short-term earthquake prediction in Northern China.
An earthquake with MS5.1 occurred in Wen'an County,Hebei Province in north China,on July 4,2006.Based on monthly average Grid data with spatial resolution of 2.5°×2.5°,getting from observations of NOAA/IR polar orbit satellite in recent years,this paper analyzed the anomalous characteristics and its evolvement in time series on ambient field of OLR in north China by using Eddy covariance means before the earthquake.The research result is as follows: The change of normal ambient field is stable,the OLR value is changed with a notably anomaly two months earlier before the earthquake,and the phenomena usually happened around the epicenter.Combining previous earthquake case study by using the similar method,the characteristics of OLR anomaly before earthquake takes the catholicity.The result must have great practical significance in the short-term earthquake prediction in Northern China.
引文
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[13]康春丽,刘德富.华南地区强震前的卫星遥感信息特征[J].华南地震,2004,24(2):1-5.
[14]刘德富,康春丽.苏门答腊岛8.7级大地震前的辐射异常现象[J].国际地震动态,2005,(1):37-39.
①刘德富等,RS技术在地震监测预报中的可应用性研究,1999年。
[2]强祖基,赁常恭.卫星热红外图像亮温异常短临震兆[J].中国科学(D缉),1998,28(6):564-573.
[3]刘德富,彭克银,刘维贺,等.地震有“热征兆”[J].地震学报,1999,21(6):652-656.
[4]Morzova L I.Satellite meteorological images as carriers of information on seismic processes[J].Ge-ology of Pacific Ocean,2000,15:439-446.
[5]Tronin A A,Hayakawa M,Molchanov O A.Thermal IR satellite data application for earthquake re-search in Japan and China[J].Journal of Geodynamics,2002,33:519-534.
[6]但尚铭,刘放,程万正.卫星遥感热辐射影响因素及其热辐射信息在地震预测中的应用[J].内陆地震,2002,16(4):372-378.
[7]Ouzounov D,Bryant N,Logan T,et al.Satellite thermal IR phenomena associated with some of themajor earthquakes in 1999—2003[J].Physics and Chemistry of the Earth,2006,31:154-163.
[8]邓明德,耿乃光,崔承禹,等.岩石应力状态改变引起岩石热状态改变的研究[J].中国地震,1997,13(2):175-185.
[9]Ouzounov D,Freund F.Mid-infrared emission prior to strong earthquakes analyzed by remote sens-ing data[J].Advances in Space Research,2004,33:268-273.
[10]Pulinets S A,Ouzounov D,Karelin A V,et al.The physical nature of thermal anomalies observedbefore strong earthquakes[J].Physics and Chemistry of the Earth,2006,31:143-153.
[11]刘德富.台湾集集强震前的卫星遥感长波辐射场变异分析[J].地球信息科学,2000,2(1):33-36.
[12]康春丽,陈正位,陈立泽,等.昆仑山口西8.1级地震的卫星热红外前兆特征分析[J].西北地震学报,2003,25(1):12-15.
[13]康春丽,刘德富.华南地区强震前的卫星遥感信息特征[J].华南地震,2004,24(2):1-5.
[14]刘德富,康春丽.苏门答腊岛8.7级大地震前的辐射异常现象[J].国际地震动态,2005,(1):37-39.
①刘德富等,RS技术在地震监测预报中的可应用性研究,1999年。
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