新疆和静5.6级地震前波速比异常震例分析
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摘要
利用新疆天山中段数字化地震波资料,采用多台和达法,计算了2008年8月30日和静5.6级地震前后波速比资料的变化情况。得到如下结果:①空间分布上,和静5.6级地震前,形成一个椭圆形低值异常区,且椭圆长半轴约70km,短半轴约65km,椭圆走向NE,和静5.6级地震则发生在该椭圆区域的西偏北部边缘;②时间进程上,和静5.6级地震前出现大约10个月的波速比低值异常,震前一个月出现明显的高值突跳点,波速比形成正常-降低-高值突跳-发震的模式。计算过程中,波速比误差控制在0.05之内,相关系数达99.0%以上。
The authors used digital wave data of earthquakes in the middle of Tianshan mountains,Xinjiang and Heda method of multi-stations to calculate changes of wave velocities ratio before and after the Hejing M5.6 earthquake on August 30,2008.They obtained the result as follows: ①In space,it forms a low value area of ellipse before the Hejing earthquake with M5.6.The half of the long axis is approximately 70km,while that of the short axis is approximately 65km.And the trend of the ellipse is NE.The Hejing M5.6 earthquake occurred in northwest part of the ellipse.②Temporarily,it appeared as low value abnormity of 10 months before the Hejing M5.6 earthquake.Before this earthquake,the value was obviously high.It forms a model of normal-fall-high value-earthquake.In the calculation process,the error of wave velocities ratio is controlled in less than 0.05,and the correlation coefficient reached above 99.0%.
The authors used digital wave data of earthquakes in the middle of Tianshan mountains,Xinjiang and Heda method of multi-stations to calculate changes of wave velocities ratio before and after the Hejing M5.6 earthquake on August 30,2008.They obtained the result as follows: ①In space,it forms a low value area of ellipse before the Hejing earthquake with M5.6.The half of the long axis is approximately 70km,while that of the short axis is approximately 65km.And the trend of the ellipse is NE.The Hejing M5.6 earthquake occurred in northwest part of the ellipse.②Temporarily,it appeared as low value abnormity of 10 months before the Hejing M5.6 earthquake.Before this earthquake,the value was obviously high.It forms a model of normal-fall-high value-earthquake.In the calculation process,the error of wave velocities ratio is controlled in less than 0.05,and the correlation coefficient reached above 99.0%.
引文
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刁桂苓、周仕勇、刘杰等,2005,岫岩地震序列的平均波速比前兆异常,华北地震科学,23(4),1～5。
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张小涛、吕坚、马广庆等,2006,九江-瑞昌地震序列的波速比特征研究,华北地震科学,24(4),36～40。
邹振轩、李金龙、俞铁宏,2006,应用多台和达法测定温州珊溪水库地区地震的平均波速比,地震,26(4),133～137。
Korneev V A,McEvilly T V,Karageorgi E D,2000,Seismological studies at Parkfield.VIII:Modeling the observed travel—timechanges,Bull Seismol Soc Amer,90,702～708.
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Nakamura A,Hasegawa A,Hirata N,et al,2002,Temporal variations of seismic wave velocity associated with1998M6.1Shizukuishi earthquake,Pure Appl Geophys,159,1183～1204.
Schaff D P,Beroza G C,2004,Coseismic and postseismic velocity changes measured by repeating earthquakes,J Geophys Res,109,B10302,doi:10.1029/2004JB003011.
蔡静观,2000,波速比计算中的不确定因素和在地震预报中的应用,地震研究,23(1),51～56。
戴维乐、张光白、夏瑞良等,1989,波速比用于地震预报程式研究,见:许绍燮、陆远忠、朱传镇等,应用地震学专辑,北京:地震出版社。
刁桂苓、周仕勇、刘杰等,2005,岫岩地震序列的平均波速比前兆异常,华北地震科学,23(4),1～5。
冯德益,1981,地震波速异常,北京:地震出版社。
冯德益,1988,地震波理论和应用,北京:地震出版社。
顾瑾萍、李清河、盛国英等,1989,地震波速比异常与预报应用,见:许绍燮、陆远忠、朱传镇等,应用地震学专辑,北京:地震出版社。
李善邦,1981,中国地震,北京:地震出版社,522～532,566～568。
陆远忠、陈章立,1985,地震预报的地震学方法,北京:地震出版社。
黎明晓、刘杰,2006,云南地区地震序列的波速比(vP/vS)异常研究,地震,26(1),26～34。
黎明晓、张晓东,2004,应用多台法测定华北地区地壳的平均波速比,地震,24(1),163～169。
梅世蓉、冯德益、张国民等,1993,中国地震预报概论,北京:地震出版社。
王桂岭、吴秀莲、敖雪明,1979,新疆一些中强震前后的波速比异常,西北地震学报,1(2),1～8。
王林瑛、郭永霞、刘芳等,2008,文安地震前后首都圈分区波速比时变特征,地震学报,30(3),240～253。
张爱香,2005,安阳及邻区中强地震前波速比时空演化特征分析与研究,防灾技术高等专科学校学报,7(1),40～45。
张小涛、吕坚、马广庆等,2006,九江-瑞昌地震序列的波速比特征研究,华北地震科学,24(4),36～40。
邹振轩、李金龙、俞铁宏,2006,应用多台和达法测定温州珊溪水库地区地震的平均波速比,地震,26(4),133～137。
Korneev V A,McEvilly T V,Karageorgi E D,2000,Seismological studies at Parkfield.VIII:Modeling the observed travel—timechanges,Bull Seismol Soc Amer,90,702～708.
Li Y G,Vidale J E,Aki K,et al,1998,Evidence of shallow fault zone healing after the1992M7.5Landers,California,earthquake,Science,279,217～219.
Nakamura A,Hasegawa A,Hirata N,et al,2002,Temporal variations of seismic wave velocity associated with1998M6.1Shizukuishi earthquake,Pure Appl Geophys,159,1183～1204.
Schaff D P,Beroza G C,2004,Coseismic and postseismic velocity changes measured by repeating earthquakes,J Geophys Res,109,B10302,doi:10.1029/2004JB003011.
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