2007年宁洱6.4级地震横波分裂研究
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摘要
通过研究2007年6月3日宁洱MS6.4地震余震序列的三分向记录,为探索横波分裂现象以及上地壳存在裂隙各向异性提供依据,并发现快速S波偏振有两个优势方向,分别为NW140°和NW150°,这与宁洱地区的主应力场方向基本一致。横波分裂延迟时间能够动态反映地下应力场的变化趋势,且较大余震发生之前延迟时间出现大幅度上升。
In this paper,the result of the study about the aftershock-swarm of the MS6.4 earthquake occurred on June 3,2007 in Ning'er,Yunnan Province was given and the existence of both shear-wave splitting and the extensive dilatancy anisotropy in the upper crust of Ning'er region were recognized.The fast shear wave has two preponderant polarization-directions—NW140°and NW150°,which agree with the regional principal compressive stress.The delay time of the shear wave dynamically responds to the variation of stress field and increases before strong aftershocks.
In this paper,the result of the study about the aftershock-swarm of the MS6.4 earthquake occurred on June 3,2007 in Ning'er,Yunnan Province was given and the existence of both shear-wave splitting and the extensive dilatancy anisotropy in the upper crust of Ning'er region were recognized.The fast shear wave has two preponderant polarization-directions—NW140°and NW150°,which agree with the regional principal compressive stress.The delay time of the shear wave dynamically responds to the variation of stress field and increases before strong aftershocks.
引文
陈慧,叶建庆,刘学军,等.2007.2007年宁洱6.4级地震监测与研究[J].地震研究,30(4):344-349.
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李克昌,赵维城,侯学英,等.1980.从思茅、普洱地震探讨断块内部地震地质特征[J].地震研究,3(1):01-05.
李白基.1996.云南禄劝地震余震分裂S波的变化[J].地震学报,18(2):224-230.
李白基,秦嘉政,钱晓东,等.2002.1995年武定6.5级地震余震的S波分裂[J].地震研究,25(2):108～114.
罗省贤,李录明.2003.基于横波分裂的地层裂缝预测方法与应用[J].成都理工大学学报(自然科学版),30(1):52-59.
Crampin S,Atkinson B k.1985.Microcracks in the Earth s crust.FirstBreak,3(3):16-20.
Crampin S,Zatsepin S V.1997.Modelling the compliance of crustal rock-II.Response to temporal changes before earthquakes[J].Geo-phys.J.Int,129:495-506.
Crampin S,Volti T,Stefansson R.1999.A successfully stress-forecastearthquake[J].Geopys.J.Int,138:F1-F5.
Garbin HD,Knopoff L.1973.The compressional modulus of a material bya random distribution of circular cracks[J].Q.Appl.Math,30:453-463.
Garbin HD,Knopoff L.1975a.The shear modulus of a material permea-ted by a random distribution of circular cracks[J].Q.Appl.Math,33:296-300.
Garbin HD,Knopoff L.1975b.Elastic modulus of a medium with liquid-filled cracks[J].Q.Appl.Math,33:301-303.
Hudson J A.1981.Wave speeds and attenuation of elastic waves in mate-rial containing cracks[J].Geophys.J.R.astr.Soc,64:133-150.
Zatsepin S V,Crampin S.1997.Modeling the compliance of crustal rock:I-Response of shear-wave splitting to differential stress[J].Geophys.J.Int,129:477-494.
高原.2000.破裂临界状态下大理岩的剪切波分裂特征[J].中国地震,16(3):197-202.
李克昌,赵维城,侯学英,等.1980.从思茅、普洱地震探讨断块内部地震地质特征[J].地震研究,3(1):01-05.
李白基.1996.云南禄劝地震余震分裂S波的变化[J].地震学报,18(2):224-230.
李白基,秦嘉政,钱晓东,等.2002.1995年武定6.5级地震余震的S波分裂[J].地震研究,25(2):108～114.
罗省贤,李录明.2003.基于横波分裂的地层裂缝预测方法与应用[J].成都理工大学学报(自然科学版),30(1):52-59.
Crampin S,Atkinson B k.1985.Microcracks in the Earth s crust.FirstBreak,3(3):16-20.
Crampin S,Zatsepin S V.1997.Modelling the compliance of crustal rock-II.Response to temporal changes before earthquakes[J].Geo-phys.J.Int,129:495-506.
Crampin S,Volti T,Stefansson R.1999.A successfully stress-forecastearthquake[J].Geopys.J.Int,138:F1-F5.
Garbin HD,Knopoff L.1973.The compressional modulus of a material bya random distribution of circular cracks[J].Q.Appl.Math,30:453-463.
Garbin HD,Knopoff L.1975a.The shear modulus of a material permea-ted by a random distribution of circular cracks[J].Q.Appl.Math,33:296-300.
Garbin HD,Knopoff L.1975b.Elastic modulus of a medium with liquid-filled cracks[J].Q.Appl.Math,33:301-303.
Hudson J A.1981.Wave speeds and attenuation of elastic waves in mate-rial containing cracks[J].Geophys.J.R.astr.Soc,64:133-150.
Zatsepin S V,Crampin S.1997.Modeling the compliance of crustal rock:I-Response of shear-wave splitting to differential stress[J].Geophys.J.Int,129:477-494.
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