2008年攀枝花6.1级地震前后波速比变化研究
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摘要
利用云南区域数字台网波形资料,采用多台法计算了2008年8月30日在川滇交界攀枝花发生的6.1级地震前后波速比VP/VS变化,结果表明:地震前3年,波速比出现一次持续时间相对较长的下降过程;震前0.5年,又出现一次持续时间相对较短、急剧下降的过程,且伴随有多次低值异常;震前2个多月至发震,波速比从低值回升至均值附近;震后波速比维持在均值上下波动,并伴有高值出现。震区南部的元谋地区和东北部的巧家—普格一带波速比异常较为明显。
Basing on waveform data in Yunnan Regional Digital Network,we calculated the variation of wave velocity ratio before and after the PanzhihuaMS6.1 earthquake which occurred on Aug.30,2008 in the boundary between Sichuan and Yunnan by multi-station method. The results showed that the wave velocity ratio decreased for a relatively long duration in study area in three years before the earthquake,and it decreased sharply for relatively short duration,accompanied by a number of low abnormal in half a year before the earthquake. From more than two months before the earthquake to earthquake occurrence,wave velocity ratio gone up again from the low value to the mean value,after the earthquake,it maintained around the mean value accompanied by the high value. Wave velocity ratio anomalies were obvious near Yuanmou and Qiaojia-Puge respectively in southern and northeast of earthquake zone.
Basing on waveform data in Yunnan Regional Digital Network,we calculated the variation of wave velocity ratio before and after the PanzhihuaMS6.1 earthquake which occurred on Aug.30,2008 in the boundary between Sichuan and Yunnan by multi-station method. The results showed that the wave velocity ratio decreased for a relatively long duration in study area in three years before the earthquake,and it decreased sharply for relatively short duration,accompanied by a number of low abnormal in half a year before the earthquake. From more than two months before the earthquake to earthquake occurrence,wave velocity ratio gone up again from the low value to the mean value,after the earthquake,it maintained around the mean value accompanied by the high value. Wave velocity ratio anomalies were obvious near Yuanmou and Qiaojia-Puge respectively in southern and northeast of earthquake zone.
引文
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Aggarwal Y P,Sykes L R,Simpson D W,et al.1975.Spatial and tempo-ral variations in ts/tp and in P wave residuals at Blue MountainLake,New York:Application to earthquake prediction[J].JGR,80(5):718-732.
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Ohtake M.1973.Changes in Vp/Vs ratio related with occurrence of someshallow earthquakes in Japan[J].J Phys Earth,21:2.
Schaff D P,Beroza G C.2004.Coseismic and postseismic velocity chan-ges measured by repeating earthquakes[J].J Geophys Res,109:B10302,doi:10.1029/2004JB003011.
Scholz C H,Sykes L R,Aggarwal Y P.1973.Earthquake prediction:Aphysical basis[J].Science,181(4102):803809.
都昌庭,徐兰芬,赵承海.2001.兴海6.6级地震前后地震波的变化[J].高原地震,13(1):38-44.
冯德益.1981.地震波速度异常[M].北京:地震出版社.
国家地震局科技监测司.1990.地震学分析预报方法程式指南[M].北京:地震出版社.
陆远忠,陈章立,王碧泉,等.1985.地震预报的地震学方法[M].北京:地震出版社.
时振梁,张少泉,赵荣国,等.1990.地震工作手册[M].北京:地震出版社.
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[J].地震学报,30(3):240-253.
徐果明,周惠兰.1982.地震学原理[M].北京:科学出版社.
叶中行,王蓉华,徐晓岭,等.2009.概率论与数理统计[M].北京:北京大学出版社:406-416.
曾文敬,项月文,邹水林.2007.九江—瑞昌主—余震的波速比变化初探[J].华南地震,27(4):73-78.
Aggarwal Y P,Sykes L R,Simpson D W,et al.1975.Spatial and tempo-ral variations in ts/tp and in P wave residuals at Blue MountainLake,New York:Application to earthquake prediction[J].JGR,80(5):718-732.
Iizuka S.1976.Changes in Vp/Vs before the Tokaochi-Oki earthquakeof May16,1968of NE Japan[J].Nature,260:415417.
McEvilly T V,Hohnson L R.1973.Earthquake of strike-slip type inCentral California:evidence on the question of dilatancy[J].Sci-ence,182(4112):581584.
Nakamura A,Hasegawa A,Hirata N,et al.2002.Temporal variations ofseismic wave velocity associated with1998M6.1Shizukuishi earth-quake[J].Pure Appl Geophys,159:11831204.
Ohtake M.1973.Changes in Vp/Vs ratio related with occurrence of someshallow earthquakes in Japan[J].J Phys Earth,21:2.
Schaff D P,Beroza G C.2004.Coseismic and postseismic velocity chan-ges measured by repeating earthquakes[J].J Geophys Res,109:B10302,doi:10.1029/2004JB003011.
Scholz C H,Sykes L R,Aggarwal Y P.1973.Earthquake prediction:Aphysical basis[J].Science,181(4102):803809.
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