川滇活动地块东边界强震危险性研究
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摘要
以川滇活动地块东边界为例,利用最近31年的地震资料,根据精细b值计算结果,研究该边界断裂带的应力空间分布及其强震危险性.研究结果显示:(1)沿川滇活动地块东边界,b值空间分布显示在不同断裂以及同一断裂不同断裂段存在较大差异,从而反映出应力积累水平的空间差异.(2)小江断裂带主干断裂上的嵩明凹凸体及存在于主干断裂附近巧家与东川间以及嵩明北西的2个凹凸体、存在于安宁河断裂冕宁附近和则木河断裂西昌附近的凹凸体以及位于鲜水河断裂中南段道孚—乾宁间大尺度的凹凸体将是川滇活动地块东边界未来大震或强震的震源区.
Taken the eastern boundary of the Sichuan-Yunnan active faulted-block in southwestern China as an example,spatial stress distribution and potential strong-earthquake risk have been studied based on detailed b value calculation from seismic data of the last 31 years.The main results show:(1) The spatial distribution of b values displays significant heterogeneity for various faults and fault-segments of the eastern boundary of the Sichuan-Yunnan active faulted-block,which reflects the spatial difference of cumulative stress level along the boundary fault zones.(2) There are several asperities,one located at Songming on Xiaojiang main fault,one between Qiaojia and Dongchuan,and one at northwestern Songming near the main fault,two near Mianning on Anninghe fault and near Xichang on Zemuhe fault,and a large-scale one from Daofu to Qianning on central-southern portion of the Xianshuihe fault.The asperities may be the potential seismogenic sources of large or strong earthquakes along the eastern-boundary in the near future.
Taken the eastern boundary of the Sichuan-Yunnan active faulted-block in southwestern China as an example,spatial stress distribution and potential strong-earthquake risk have been studied based on detailed b value calculation from seismic data of the last 31 years.The main results show:(1) The spatial distribution of b values displays significant heterogeneity for various faults and fault-segments of the eastern boundary of the Sichuan-Yunnan active faulted-block,which reflects the spatial difference of cumulative stress level along the boundary fault zones.(2) There are several asperities,one located at Songming on Xiaojiang main fault,one between Qiaojia and Dongchuan,and one at northwestern Songming near the main fault,two near Mianning on Anninghe fault and near Xichang on Zemuhe fault,and a large-scale one from Daofu to Qianning on central-southern portion of the Xianshuihe fault.The asperities may be the potential seismogenic sources of large or strong earthquakes along the eastern-boundary in the near future.
引文
[1]Wiemer S,Wyss M.Mapping the frequency-magnitudedistributionin asperities:Ani mproved technique to calculaterecurrence ti mes?J.Geophys.Res.,1997,102(B7):15115~15128
[2]Wyss M,Schorlemmer D,Wiemer S.Mapping asperities bymini ma of local recurrence ti me:San Jacinto-Elsinore faultzones.J.Geophys.Res.,2000,105(B4):7829~7844
[3]Scholz C H.The frequency-magnitude relation tomicrofracturingin rock andits relation to earthquakes.Bull.Seism.Soc.Am.,1968,58:399~415
[4]Urbancic T I,Trifu C I,Long J M,et al.Space-ti mecorrelation ofbvalues with stress release.Pure Appl.Geophys.,1992,139:449~462
[5]易桂喜,闻学泽,范军等.由地震活动参数分析安宁河—则木河断裂带的现今活动习性及地震危险性.地震学报,2004,26(3):294~303Yi G X,Wen X Z,Fan J,et al.Assessing current faultingbehaviors and seismic risk of the Anninghe-Zemuhe fault zonefromseismicity parameters.Acta Seismologica Sinica,2004,17(3):322~333
[6]易桂喜,闻学泽,徐锡伟.山西断陷带太原—临汾部分的强地震平均复发间隔与未来危险段落研究.地震学报,2004,26(4):387~395Yi G X,Wen X Z,Xu X W.Average recurrence intervals ofstrong earthquakes and potential risky segments along theTaiyuan-Linfen portion of the Shanxi graben system.ActaSeismologica Sinica,2004,17(4):426~437
[7]易桂喜,范军,闻学泽.由现今地震活动分析鲜水河断裂带中—南段活动习性与强震危险地段.地震,2005,25(1):58~66Yi G X,Fan J,Wen X Z.Study on faulting behavior andfault-segments for potential strong earthquake risk along thecentral-southern segment of Xianshuihe fault zone based oncurrent seismicity.Earthquake(in Chinese),2005,25(1):58~66
[8]易桂喜,闻学泽,王思维等.由地震活动参数分析龙门山—岷山断裂带的现今活动习性与地震危险性.中国地震,2006,22(2):117~125Yi G X,Wen X Z,Wang S W,et al.Study on fault slidingbehaviors and strong-earthquake risk of the Longmenshan-Minshan fault zones from current seismicity parameters.Earthquake Research in China(in Chinese),2006,22(2):117~125
[9]易桂喜,闻学泽.多地震活动性参数在断裂带现今活动习性与地震危险性评价中的应用与问题.地震地质,2007,29(2):254~271Yi G X,Wen X Z.The application andli mitation of multipleseismicity parameters to assessing current faulting behaviorand seismic potential of active fault zones.Seismology andGeology(in Chinese),2007,29(2):254~271
[10]《2006~2020年中国大陆地震危险区与地震灾害损失预测研究》项目组.2006~2020年中国大陆地震危险区与地震灾害损失预测研究.北京:地震出版社,2007.1~296Research Group of“Researches on Earthquake Risk Regionsand Losses Prediction of China Continent Duringfrom2006 to2020”.Researches on Earthquake Risk Regions and LossesPrediction of China Continent During from 2006 to 2020(inChinese).Beijing:Seismological Press,2007.1~296
[11]闻学泽.小江断裂带的破裂分段与地震潜势概率估计.地震学报,1993,15(3):322~330Wen X Z.Rupture segmentation and assessment ofprobabilities of seismic potential on the Xiaojiang fault zone.Acta Seismologica Sinica(in Chinese),1993,6(4):993~1004
[12]Wen X Z,Ma S L,Xu X W,et al.Historical pattern andbehavior of earthquake ruptures along the eastern boundaryof the Sichuan-Yunan faulted-block,southwestern China.Phys.Earth Planet.Interiors,2008,doi:10.1016/J.pepi.2008.04.013
[13]Wyss M,Sammis C G,Nadeau R M,et al.Fractal di mensionandb-value on creeping and locked patches of the SanAndreas fault near Parkfield,California.Bull.Seism.Soc.Am.,2004,94(2):410~421
[14]Wells D L,Coppersmith K J.New empirical relationshipsamong magnitude,rupture length,rupture width,rupturearea,and surface displacement.Bull.Seism.Soc.Am.,1994,84:974~1002
[15]闻学泽.活动断裂地震潜势的定量评估.北京:地震出版社,1995.1~150Wen X Z.Quantitative Esti mates of Seismic Potential onActive Faults(in Chinese).Beijing:Seismological Press,1995.1~150
[16]Papadi mitriou E,Wen X Z,Karakostas V,et al.Earthquaketriggering along the Xianshuihe fault zone of westernSichuan,China.Pure and Applied Geophysics,2004,161:1683~1707
[17]Gkarlaouni Ch,Oapadi mitriou E E,Karakotas V G,等.断层相互作用对中国川滇地区地震危险评估的意义.地震学报,2008,30(2):176~197Gkarlaouni Ch,Oapadi mitriou E E,Karakotas V G,et al.I mplication of fault interaction to seismic hazard assessmentin Sichuan-Yunnan region of southeastern China.ActaSeismologica Sinica(in Chinese),2008,30(2):176~197
[18]Toda S,Lin J,Meghraoui M,et al.12 May 2008M=7.9Wenchuan,China,earthquake calculated to increase failurestress and seismicity rate on three major fault systems.Geophysical Research Letters,2008,in press
[2]Wyss M,Schorlemmer D,Wiemer S.Mapping asperities bymini ma of local recurrence ti me:San Jacinto-Elsinore faultzones.J.Geophys.Res.,2000,105(B4):7829~7844
[3]Scholz C H.The frequency-magnitude relation tomicrofracturingin rock andits relation to earthquakes.Bull.Seism.Soc.Am.,1968,58:399~415
[4]Urbancic T I,Trifu C I,Long J M,et al.Space-ti mecorrelation ofbvalues with stress release.Pure Appl.Geophys.,1992,139:449~462
[5]易桂喜,闻学泽,范军等.由地震活动参数分析安宁河—则木河断裂带的现今活动习性及地震危险性.地震学报,2004,26(3):294~303Yi G X,Wen X Z,Fan J,et al.Assessing current faultingbehaviors and seismic risk of the Anninghe-Zemuhe fault zonefromseismicity parameters.Acta Seismologica Sinica,2004,17(3):322~333
[6]易桂喜,闻学泽,徐锡伟.山西断陷带太原—临汾部分的强地震平均复发间隔与未来危险段落研究.地震学报,2004,26(4):387~395Yi G X,Wen X Z,Xu X W.Average recurrence intervals ofstrong earthquakes and potential risky segments along theTaiyuan-Linfen portion of the Shanxi graben system.ActaSeismologica Sinica,2004,17(4):426~437
[7]易桂喜,范军,闻学泽.由现今地震活动分析鲜水河断裂带中—南段活动习性与强震危险地段.地震,2005,25(1):58~66Yi G X,Fan J,Wen X Z.Study on faulting behavior andfault-segments for potential strong earthquake risk along thecentral-southern segment of Xianshuihe fault zone based oncurrent seismicity.Earthquake(in Chinese),2005,25(1):58~66
[8]易桂喜,闻学泽,王思维等.由地震活动参数分析龙门山—岷山断裂带的现今活动习性与地震危险性.中国地震,2006,22(2):117~125Yi G X,Wen X Z,Wang S W,et al.Study on fault slidingbehaviors and strong-earthquake risk of the Longmenshan-Minshan fault zones from current seismicity parameters.Earthquake Research in China(in Chinese),2006,22(2):117~125
[9]易桂喜,闻学泽.多地震活动性参数在断裂带现今活动习性与地震危险性评价中的应用与问题.地震地质,2007,29(2):254~271Yi G X,Wen X Z.The application andli mitation of multipleseismicity parameters to assessing current faulting behaviorand seismic potential of active fault zones.Seismology andGeology(in Chinese),2007,29(2):254~271
[10]《2006~2020年中国大陆地震危险区与地震灾害损失预测研究》项目组.2006~2020年中国大陆地震危险区与地震灾害损失预测研究.北京:地震出版社,2007.1~296Research Group of“Researches on Earthquake Risk Regionsand Losses Prediction of China Continent Duringfrom2006 to2020”.Researches on Earthquake Risk Regions and LossesPrediction of China Continent During from 2006 to 2020(inChinese).Beijing:Seismological Press,2007.1~296
[11]闻学泽.小江断裂带的破裂分段与地震潜势概率估计.地震学报,1993,15(3):322~330Wen X Z.Rupture segmentation and assessment ofprobabilities of seismic potential on the Xiaojiang fault zone.Acta Seismologica Sinica(in Chinese),1993,6(4):993~1004
[12]Wen X Z,Ma S L,Xu X W,et al.Historical pattern andbehavior of earthquake ruptures along the eastern boundaryof the Sichuan-Yunan faulted-block,southwestern China.Phys.Earth Planet.Interiors,2008,doi:10.1016/J.pepi.2008.04.013
[13]Wyss M,Sammis C G,Nadeau R M,et al.Fractal di mensionandb-value on creeping and locked patches of the SanAndreas fault near Parkfield,California.Bull.Seism.Soc.Am.,2004,94(2):410~421
[14]Wells D L,Coppersmith K J.New empirical relationshipsamong magnitude,rupture length,rupture width,rupturearea,and surface displacement.Bull.Seism.Soc.Am.,1994,84:974~1002
[15]闻学泽.活动断裂地震潜势的定量评估.北京:地震出版社,1995.1~150Wen X Z.Quantitative Esti mates of Seismic Potential onActive Faults(in Chinese).Beijing:Seismological Press,1995.1~150
[16]Papadi mitriou E,Wen X Z,Karakostas V,et al.Earthquaketriggering along the Xianshuihe fault zone of westernSichuan,China.Pure and Applied Geophysics,2004,161:1683~1707
[17]Gkarlaouni Ch,Oapadi mitriou E E,Karakotas V G,等.断层相互作用对中国川滇地区地震危险评估的意义.地震学报,2008,30(2):176~197Gkarlaouni Ch,Oapadi mitriou E E,Karakotas V G,et al.I mplication of fault interaction to seismic hazard assessmentin Sichuan-Yunnan region of southeastern China.ActaSeismologica Sinica(in Chinese),2008,30(2):176~197
[18]Toda S,Lin J,Meghraoui M,et al.12 May 2008M=7.9Wenchuan,China,earthquake calculated to increase failurestress and seismicity rate on three major fault systems.Geophysical Research Letters,2008,in press
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