基于小波包分析的OLR地震异常信息提取初探
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摘要
长波辐射OLR具有可覆盖范围大的特点。本文提取其与地震相关的异常信息,并尝试将所得结果应用于地震预测中,这对于弥补我国部分处于前兆台网监测范围之外地区具有重要意义。文中首先对小波包方法及其原理进行了简要介绍,在此基础上,尝试采用该方法对长波辐射值OLR时间序列进行分解重构,提取异常信息。通过对15个不同震例的研究表明,地震前的10个月内,重构信号均出现能量严重衰减的现象,且其持续时间长短与发震震级之间存在一定相关性。
Outgoing Long-wave Radiation(OLR) has the characteristic of large coverage range.Earthquake-related anomaly information of OLR is extracted and applied to earthquake prediction,which can make up the shortage that some areas of China are out of the monitoring range of the current precursory seismic network.In this paper,the wavelet packet method and its principle are introduced briefly,and the time sequence of OLR is decomposed and reconstructed with wavelet packet decomposition in order to extract earthquake-related anomaly information in 15 earthquake cases.The results show that the serious energy attenuations of reconstructed signals often appear during 10 months before the shocks,and there is a significant correlation between the duration of energy attenuation and earthquake magnitude.
Outgoing Long-wave Radiation(OLR) has the characteristic of large coverage range.Earthquake-related anomaly information of OLR is extracted and applied to earthquake prediction,which can make up the shortage that some areas of China are out of the monitoring range of the current precursory seismic network.In this paper,the wavelet packet method and its principle are introduced briefly,and the time sequence of OLR is decomposed and reconstructed with wavelet packet decomposition in order to extract earthquake-related anomaly information in 15 earthquake cases.The results show that the serious energy attenuations of reconstructed signals often appear during 10 months before the shocks,and there is a significant correlation between the duration of energy attenuation and earthquake magnitude.
引文
[1]高立新,郑斯华,丁风和.内蒙古中西部地区震源参数和场地响应反演[J].西北地震学报,2005,27(2):109-114.
[2]刘德富,罗灼礼,彭克银.强烈地震前的OLR异常现象[J].地震,1997,17(2):126-132.
[3]康春丽,王亚丽,刘德富.文安地震前华北区域长波辐射场的异常特征分析[J].地震,2007,27(3):83-88.
[4]王亚丽,陈桂华,康春丽,等.利用小波包分析进行地震相关热红外辐射异常信息检测[J].地球物理学进展,2008,23(2):368-374.
[5]冯蜀青,李萍,杨英莲,等.昆仑山地震前长波辐射异常特征分析[J].高原地震,2002,14(2):22-28.
[6]刘德富,康春丽.地球长波辐射(OLR)遥感与重大自然灾害预测[J].地学前缘,2003,10(2):427-435.
[7]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.
[8]DENG Ming-de,GENG Nai-guang,CUI cheng-yu,et al.The study on the variation of thermalstate of rocks caused by the variation of the stress state of rocks[J].Earthquake Research in China,1997,13(2):179-185.
[9]朱丽娟,田慕琴,刘娇,等.基于小波包的异步电动机故障分析[J].电机与控制应用,2008,35(1):50-53.
[10]高立新,阎海滨,丁风和,等.东乌珠穆沁旗5.9级地震参数及序列特征[J].东北地震研究,2005,21(2):16-23.
[2]刘德富,罗灼礼,彭克银.强烈地震前的OLR异常现象[J].地震,1997,17(2):126-132.
[3]康春丽,王亚丽,刘德富.文安地震前华北区域长波辐射场的异常特征分析[J].地震,2007,27(3):83-88.
[4]王亚丽,陈桂华,康春丽,等.利用小波包分析进行地震相关热红外辐射异常信息检测[J].地球物理学进展,2008,23(2):368-374.
[5]冯蜀青,李萍,杨英莲,等.昆仑山地震前长波辐射异常特征分析[J].高原地震,2002,14(2):22-28.
[6]刘德富,康春丽.地球长波辐射(OLR)遥感与重大自然灾害预测[J].地学前缘,2003,10(2):427-435.
[7]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.
[8]DENG Ming-de,GENG Nai-guang,CUI cheng-yu,et al.The study on the variation of thermalstate of rocks caused by the variation of the stress state of rocks[J].Earthquake Research in China,1997,13(2):179-185.
[9]朱丽娟,田慕琴,刘娇,等.基于小波包的异步电动机故障分析[J].电机与控制应用,2008,35(1):50-53.
[10]高立新,阎海滨,丁风和,等.东乌珠穆沁旗5.9级地震参数及序列特征[J].东北地震研究,2005,21(2):16-23.
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