辽宁1999年M_S5.9岫岩地震的剪切波分裂特征
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摘要
利用辽宁遥测数字地震台网营口台的地震波形资料,采用高原等剪切波分裂SAM分析方法,对1999年11月29日辽宁省岫岩MS5.9(ML5.3)地震前后的地震序列进行了剪切波分裂分析.通过对营口台的资料分析表明,快剪切波优势偏振方向为ENE--WSW向,与该地区主压应力方向一致,也与华北区域构造应力场方向一致;平均慢剪切波时间延迟在岫岩地震前显示增加,可能反映了震前的应力积累过程.营口台的快剪切波优势偏振方向还与小地震活动空间分布走向一致,与活动断层走向相关.快剪切波偏振的月平均变化直方图也显示,地震前两个月快剪切波偏振方向似乎也有变化,但这个现象还需要更多资料的证实.
Using seismic waveform data recorded at station Yingkou (YK) of Liaoning Telemetry Digital Seismic Network, this paper studied the characteristics of shear-wave splitting before and after the Xiuyan MS5.9 (ML5.3) earthquake on November 29, 1999, with the SAM method (Gao et al). The result shows that predominant polarization of fast shear-waves at YK is in direction of ENE--WSW, consistent with the direction of regional principal compressive stress and also consistent with the direction of regional tectonic stress field in North China. The time-delays increased before the Xiuyan earthquake, indicating stress accumulation before the mainshock. Predominant polarization of fast shear-waves at YK is also related to the spatial distribution of small earthquakes and correlated to the fault strike. The histogram of monthly average polarizations of fast shear-waves shows that the polarization of fast shear-waves seems to have changed from two months before the mainshock, but this needs to be verified with more data.
Using seismic waveform data recorded at station Yingkou (YK) of Liaoning Telemetry Digital Seismic Network, this paper studied the characteristics of shear-wave splitting before and after the Xiuyan MS5.9 (ML5.3) earthquake on November 29, 1999, with the SAM method (Gao et al). The result shows that predominant polarization of fast shear-waves at YK is in direction of ENE--WSW, consistent with the direction of regional principal compressive stress and also consistent with the direction of regional tectonic stress field in North China. The time-delays increased before the Xiuyan earthquake, indicating stress accumulation before the mainshock. Predominant polarization of fast shear-waves at YK is also related to the spatial distribution of small earthquakes and correlated to the fault strike. The histogram of monthly average polarizations of fast shear-waves shows that the polarization of fast shear-waves seems to have changed from two months before the mainshock, but this needs to be verified with more data.
引文
曹凤娟,王连权,张萍,迮安民,刘友富.2005.岫岩MS5.4地震前后S波分裂研究[J].东北地震研究,21(4):39--44.
高原,冯德益.1993.大同地区近震S波分裂的观测与研究[J].地震学报,15(增刊):521--527.
高原,郑斯华.1994.唐山地区剪切波分裂研究(Ⅱ):相关函数分析法[J].中国地震,10(增刊):11--21.
高原,郑斯华,孙勇.1995.唐山地区地壳裂隙各向异性[J].地震学报,17(3):283--293.
高原,郑斯华,王培德.1996.海南省东方地区1992年小震群剪切波分裂研究[J].地球物理学报,39(2):221--232.
高原,刘希强,梁维,郝平.2004.剪切波分裂系统分析办法(SAM)软件系统[J].中国地震,20(1):101--107.
高原,石玉涛,梁维,刘希强,郝平.2008.剪切波分裂系统分析系统SAM(2007):软件系统.中国地震,24(待发表).
高常波,钟以章.2000.1999年辽宁海城—岫岩5.6级地震的地质构造背景和发震构造[J].地震地质,22(4):405--412.
蒋秀琴,佟晓辉.2001.1999年11月29日辽宁岫岩—海城MS5.4地震综述[J].地震地磁观测与研究,22(2):1--9.
兰从欣,刘杰,马士振,武敏捷,苗春兰.2006.岫岩5.4级地震序列主应力变化特征研究[J].地震,26(2):73--82.
吕培苓,杨智娴,王晓青,丁香,窦爱霞.2004.1999年岫岩地震序列研究[J].地震,24(4):45--50.
马杏垣.1989.中国岩石圈动力学地图集[M].北京:中国地图出版社:32--33.
石玉涛,高原,吴晶,罗艳,苏有锦.2006.云南地区地壳介质各向异性:快剪切波偏振特性[J].地震学报,28(6):574--585.
万波.2000.岫岩—海城5.6级地震地质背景及其发震构造[J].东北地震研究,16(2):27--32.
吴晶,高原,陈运泰,黄金莉.2007.首都圈西北部地区地壳介质地震各向异性特征初步研究[J].地球物理学报,50(1):209--220.
张萍,蒋秀琴.2001.岫岩—海城MS5.4地震序列的震源机制解及应力场特征[J].地震地磁观测与研究,22(2):76--82.
张萍,谷光裕,高艳玲.2001.岫岩—海城M5.4地震序列震源机制解[J].地震,21(1):98--101.
张中杰.2002.地震各向异性研究进展[J].地球物理学进展,17(2):281--293.
Crampin S.1999.Calculable fluid-rockinteractions[J].J Geol Soc Lond,156:501--514.
Crampin S.2001.Developing stress-monitoring sites using cross-hole seismology to stress-forecast the ti mes and magni-tudes of future earthquakes[J].Tectonophysics,338:233--245.
Crampin S,Atkinson B K.1985.Microcracks in the earth’s crust[J].First Break,3(3):16--20.
Crampin S,Chastin S,Gao Y.2003a.Shear-wave splitting in a critical crust:Ⅲ-preli minary report of multi-variablemeasurements in active tectonics[J].J Appl Geophys,54:265--277.
Crampin S,Gao Y,Chastin S,Peacock S,Jackson P.2003b.Speculations on earthquake forecasting[J].Seism ResLett,74(3):271--273.
Creager K C.1992.Anisotropy of the inner core fromdifferential travel ti mes of the phases PKP and PKIKP[J].Na-ture,356:309--314.
Crampin S,Peacock S.2005.Areviewof shear-wave splittingin the compliant crack-critical anisotropic earth[J].WaveMotion,41:59--77.
Gao Y,Crampin S.2004.Observations of stress relaxation before earthquakes[J].Geophys J Int,157(2):578--582.
Gao Y,Crampin S.2006.Afurther stress-forecast earthquake(with hindsight),where migration of source earthquakescauses anomalies in shear-wave polarizations[J].Tectonophysics,426(3/4):253--262.
Gerst A,Savage MK.2004.Seismic anisotropy beneath Ruapehu volcano:Apossible eruptionforecasting tool[J].Sci-ence,306(5701):1543--1547.
Morelli A,Dziewonski A M,Woodhouse J H.1986.Anisotropy of the inner-core infered from PKIKPtravel ti mes[J].Geophys Res Lett,13:1545--1548.
Mizuno T,Ito H,Kuwahara Y,I manishi K,Takeda T.2005.Spatial variation of shear-wave splitting across an activefault andits i mplication for stress accumulation mechanism of inland earthquakes:The Atosugawa fault case[J].Geophys Res Lett,32:L20305,doi:10.1029/2005GL023875.
Padhy S,Crampin S.2006.High pore-fluid pressures at Bhuj,inferred from90°-flips in shear-wave polarizations[J].Geophys J Int,164:370--376.
Silver P G.1996.Seismic anisotropy beneaththe continents:Probingthe depths of geology[J].Annual Rev Earth PlanetSci,24:385--432.
Tang C,Rial J A,Lees J M.2005.Shear-wave splitting:Adiagnostic tool to monitor fluid pressurein geothermal fields[J].Geophys Res Lett,32:L21317,doi:10.1029/2005GL023551.
Woodhouse J H,Giardini D,Li X D.1986.Evidence for inner-core anisotropy fromfree oscillations[J].Geophys ResLett,13:1549--1552.
高原,冯德益.1993.大同地区近震S波分裂的观测与研究[J].地震学报,15(增刊):521--527.
高原,郑斯华.1994.唐山地区剪切波分裂研究(Ⅱ):相关函数分析法[J].中国地震,10(增刊):11--21.
高原,郑斯华,孙勇.1995.唐山地区地壳裂隙各向异性[J].地震学报,17(3):283--293.
高原,郑斯华,王培德.1996.海南省东方地区1992年小震群剪切波分裂研究[J].地球物理学报,39(2):221--232.
高原,刘希强,梁维,郝平.2004.剪切波分裂系统分析办法(SAM)软件系统[J].中国地震,20(1):101--107.
高原,石玉涛,梁维,刘希强,郝平.2008.剪切波分裂系统分析系统SAM(2007):软件系统.中国地震,24(待发表).
高常波,钟以章.2000.1999年辽宁海城—岫岩5.6级地震的地质构造背景和发震构造[J].地震地质,22(4):405--412.
蒋秀琴,佟晓辉.2001.1999年11月29日辽宁岫岩—海城MS5.4地震综述[J].地震地磁观测与研究,22(2):1--9.
兰从欣,刘杰,马士振,武敏捷,苗春兰.2006.岫岩5.4级地震序列主应力变化特征研究[J].地震,26(2):73--82.
吕培苓,杨智娴,王晓青,丁香,窦爱霞.2004.1999年岫岩地震序列研究[J].地震,24(4):45--50.
马杏垣.1989.中国岩石圈动力学地图集[M].北京:中国地图出版社:32--33.
石玉涛,高原,吴晶,罗艳,苏有锦.2006.云南地区地壳介质各向异性:快剪切波偏振特性[J].地震学报,28(6):574--585.
万波.2000.岫岩—海城5.6级地震地质背景及其发震构造[J].东北地震研究,16(2):27--32.
吴晶,高原,陈运泰,黄金莉.2007.首都圈西北部地区地壳介质地震各向异性特征初步研究[J].地球物理学报,50(1):209--220.
张萍,蒋秀琴.2001.岫岩—海城MS5.4地震序列的震源机制解及应力场特征[J].地震地磁观测与研究,22(2):76--82.
张萍,谷光裕,高艳玲.2001.岫岩—海城M5.4地震序列震源机制解[J].地震,21(1):98--101.
张中杰.2002.地震各向异性研究进展[J].地球物理学进展,17(2):281--293.
Crampin S.1999.Calculable fluid-rockinteractions[J].J Geol Soc Lond,156:501--514.
Crampin S.2001.Developing stress-monitoring sites using cross-hole seismology to stress-forecast the ti mes and magni-tudes of future earthquakes[J].Tectonophysics,338:233--245.
Crampin S,Atkinson B K.1985.Microcracks in the earth’s crust[J].First Break,3(3):16--20.
Crampin S,Chastin S,Gao Y.2003a.Shear-wave splitting in a critical crust:Ⅲ-preli minary report of multi-variablemeasurements in active tectonics[J].J Appl Geophys,54:265--277.
Crampin S,Gao Y,Chastin S,Peacock S,Jackson P.2003b.Speculations on earthquake forecasting[J].Seism ResLett,74(3):271--273.
Creager K C.1992.Anisotropy of the inner core fromdifferential travel ti mes of the phases PKP and PKIKP[J].Na-ture,356:309--314.
Crampin S,Peacock S.2005.Areviewof shear-wave splittingin the compliant crack-critical anisotropic earth[J].WaveMotion,41:59--77.
Gao Y,Crampin S.2004.Observations of stress relaxation before earthquakes[J].Geophys J Int,157(2):578--582.
Gao Y,Crampin S.2006.Afurther stress-forecast earthquake(with hindsight),where migration of source earthquakescauses anomalies in shear-wave polarizations[J].Tectonophysics,426(3/4):253--262.
Gerst A,Savage MK.2004.Seismic anisotropy beneath Ruapehu volcano:Apossible eruptionforecasting tool[J].Sci-ence,306(5701):1543--1547.
Morelli A,Dziewonski A M,Woodhouse J H.1986.Anisotropy of the inner-core infered from PKIKPtravel ti mes[J].Geophys Res Lett,13:1545--1548.
Mizuno T,Ito H,Kuwahara Y,I manishi K,Takeda T.2005.Spatial variation of shear-wave splitting across an activefault andits i mplication for stress accumulation mechanism of inland earthquakes:The Atosugawa fault case[J].Geophys Res Lett,32:L20305,doi:10.1029/2005GL023875.
Padhy S,Crampin S.2006.High pore-fluid pressures at Bhuj,inferred from90°-flips in shear-wave polarizations[J].Geophys J Int,164:370--376.
Silver P G.1996.Seismic anisotropy beneaththe continents:Probingthe depths of geology[J].Annual Rev Earth PlanetSci,24:385--432.
Tang C,Rial J A,Lees J M.2005.Shear-wave splitting:Adiagnostic tool to monitor fluid pressurein geothermal fields[J].Geophys Res Lett,32:L21317,doi:10.1029/2005GL023551.
Woodhouse J H,Giardini D,Li X D.1986.Evidence for inner-core anisotropy fromfree oscillations[J].Geophys ResLett,13:1549--1552.
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