汶川8.0级地震区域地震能量场分析
|
摘要
将地震活动作为随机场,将地震释放能量作为地震活动场的基本要素,采用自然正交函数(或称经验正交函数)展开方法,讨论了2008年汶川8.0级地震前区域地震活动能量场的时间和空间特征.结果表明,在汶川8.0级地震前能量场的几个主要特征值对应的特征向量(典型场)的时间权重因子出现了非常突出的上升或下降异常变化,主要典型场的空间图像也显示出一些异常分布特征,可作为地震预测的一种异常指标.笔者认为该方法是一种值得进一步探讨的地震活动性预测方法.
Taking the seismic activity as the random field and taking the energy released by earthquakes as the basic elements of the seismicity field,the method of natural perpendicular function(or named experiential perpendicular function) development has been adopted to discuss the spatiotemporal features about the energy field of the regional seismic activity before MS 8.0 earthquake,Wenchuan,Sichuan,2008.The results have showed that,before Wenchuan MS 8.0 earthquake,the time weight factors of the eigenvectors(typical field) of the energy field that several key eigenvalues correspond to before Wenchuan MS 8.0 earthquake have appeared very evident rising or decreasing abnormal changes.The spatial image of the key typical fields has also showed some abnormal distributional features which could be the short-term index for earthquake forecasting.The author thinks that this method is a seismic activity forecasting method that worth further discussing.
Taking the seismic activity as the random field and taking the energy released by earthquakes as the basic elements of the seismicity field,the method of natural perpendicular function(or named experiential perpendicular function) development has been adopted to discuss the spatiotemporal features about the energy field of the regional seismic activity before MS 8.0 earthquake,Wenchuan,Sichuan,2008.The results have showed that,before Wenchuan MS 8.0 earthquake,the time weight factors of the eigenvectors(typical field) of the energy field that several key eigenvalues correspond to before Wenchuan MS 8.0 earthquake have appeared very evident rising or decreasing abnormal changes.The spatial image of the key typical fields has also showed some abnormal distributional features which could be the short-term index for earthquake forecasting.The author thinks that this method is a seismic activity forecasting method that worth further discussing.
引文
[1]滕春凯,白武明,王新华.流变介质中亚临界扩展前地震孕育过程的能量积累.地球物理学报,1991,13(1):32-41.Teng C K,Bai W M,Wang X H.Energy accumulation ofseismogenic process before subcritical spreading in rheologicalmedium.Chinese J.Geophys.(in Chinese),1991,13(1):32-41.
[2]荆燕,李宏,熊玉珍等.利用地震矩张量与GPS资料推算中国大陆现今地壳运动能量分布特征.高校地质学报,2009,15(1):108-114.Jing Y,Li H,Xiong Y Z,et al.Use seismic moment tensorand GPS data to analyse the recent crustal movement energydistribution characteristics of China Continent.GeologicalJournal of China Universities(in Chinese),2009,15(1):108-114.
[3]秦嘉政,钱晓东,叶建庆等.用峰值速度估算姚安地震序列的地震能量.地震学报,2002,24(1):98-102.Qin J Z,Qian X D,Ye J Q,et al.Energy of YAO’ANearthquake sequence estimated by using peak velocity.ActaSeismologica Sinica(in Chinese),2002,24(1):98-102.
[4]陈培善,Duda S J.地震辐射能对环境应力场的依赖性.地震学报,1993,15(2):146-152.Chen P S,Duda S J.The dependence of seismic radiant energyon the environmental stress field.Acta Seismologica Sinica(inChinese),1993,15(2):146-152.
[5]郑熙铭,肖家鑫,林家逖.地震前兆场的演化和能量非线性聚集的关系.中国地震,1998,14(1):74-80.Zheng X M,Xiao J X,Lin J T.The relation between theevolution process of seismic precursory fields and the nonlinearconcentration of energy.Earthquake Research in China(inChinese),1998,14(1):74-80.
[6]杨明芝,赵卫明.宁夏及邻近地区地震活动能量场的统计分析.地震学报,2004,26(5):516-522.Yang M Z,Zhao W M.Statistical analysis on energy field ofseismicity in Ningxia and its neighborhood region.ActaSeismologica Sinica(in Chinese),2004,26(5):516-522.
[7]罗国富,杨明芝.云南地区地震活动能量场的时空分布特征.中国地震,2005,21(3):332-340.Luo G F,Yang M Z.Space-time distributed characteristics onenergy field of earthquake in the Yunnan region.EarthquakeResearch in China(in Chinese),2005,21(3):332-340.
[2]荆燕,李宏,熊玉珍等.利用地震矩张量与GPS资料推算中国大陆现今地壳运动能量分布特征.高校地质学报,2009,15(1):108-114.Jing Y,Li H,Xiong Y Z,et al.Use seismic moment tensorand GPS data to analyse the recent crustal movement energydistribution characteristics of China Continent.GeologicalJournal of China Universities(in Chinese),2009,15(1):108-114.
[3]秦嘉政,钱晓东,叶建庆等.用峰值速度估算姚安地震序列的地震能量.地震学报,2002,24(1):98-102.Qin J Z,Qian X D,Ye J Q,et al.Energy of YAO’ANearthquake sequence estimated by using peak velocity.ActaSeismologica Sinica(in Chinese),2002,24(1):98-102.
[4]陈培善,Duda S J.地震辐射能对环境应力场的依赖性.地震学报,1993,15(2):146-152.Chen P S,Duda S J.The dependence of seismic radiant energyon the environmental stress field.Acta Seismologica Sinica(inChinese),1993,15(2):146-152.
[5]郑熙铭,肖家鑫,林家逖.地震前兆场的演化和能量非线性聚集的关系.中国地震,1998,14(1):74-80.Zheng X M,Xiao J X,Lin J T.The relation between theevolution process of seismic precursory fields and the nonlinearconcentration of energy.Earthquake Research in China(inChinese),1998,14(1):74-80.
[6]杨明芝,赵卫明.宁夏及邻近地区地震活动能量场的统计分析.地震学报,2004,26(5):516-522.Yang M Z,Zhao W M.Statistical analysis on energy field ofseismicity in Ningxia and its neighborhood region.ActaSeismologica Sinica(in Chinese),2004,26(5):516-522.
[7]罗国富,杨明芝.云南地区地震活动能量场的时空分布特征.中国地震,2005,21(3):332-340.Luo G F,Yang M Z.Space-time distributed characteristics onenergy field of earthquake in the Yunnan region.EarthquakeResearch in China(in Chinese),2005,21(3):332-340.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心