汶川地震的6区域模型加速度峰值衰减关系
|
摘要
利用加速度记录直接拟合衰减关系时,几乎所有现行文献都采用圆模型,以震中距或震源距为观测点坐标位置的唯一统计量。对于长断层的大震而言,等震线的圆模型假设和实际等震线图存在严重的偏差,为修正这种偏差,作者曾提出了4区域的椭圆模型,但是该模型忽略了断层长度垂直范围的2个区域,导致其等震线形状没有沿着断裂方向"发散开"的趋势。且不能反映破裂方向对短轴衰减的影响。该文提出的加速度衰减关系的6区域模型,通过过断层方向和过断层两端点且垂直于断层6条分割线,将地震记录观测点位置分为6个区域,通过研究沿分割线方向的衰减关系得到地震动衰减与衰减路径所处区域的相关性。以汶川8.0级地震为例,说明模型下的6条衰减关系,各自代表的物理意义以及汶川地震地震动峰值加速度衰减的区域特性。在拟合精度上,该模型较圆模型有大幅提高,比4区域椭圆模型略高,在反映地震动区域特性上,比4区域模型更加细致的反映了断层破裂方向效应和上下盘效应。
At present,euqi-distance circle model is generally used for directly fitting acceleration peak attenuation.Epicenter distance or focal distance is the only coordinate statistical parameter of seismic station.For large earthquake with a long fault,the iso-seismical curve of euqi-distance exists serious deviation from realistic iso-seismal curve.Six-area model was addressed to correct the deviation.With the model,seismic station was divided into six areas by two cut lines of coincided with fault and four cut lines perpendicular to fault.The acceleration peak attenuation curve along cut lines was fitted to analyse the relationship between attenuation curve and area seismic station.Take Wenchuan earthquake for an instance,the accuracy of the model is much higher than that of euqi-distance circle model and a little higher than that of four-area elliptical model.And the model is more accurate than four-area elliptical model in reflecting hanging and foot wall effect and direction effect.
At present,euqi-distance circle model is generally used for directly fitting acceleration peak attenuation.Epicenter distance or focal distance is the only coordinate statistical parameter of seismic station.For large earthquake with a long fault,the iso-seismical curve of euqi-distance exists serious deviation from realistic iso-seismal curve.Six-area model was addressed to correct the deviation.With the model,seismic station was divided into six areas by two cut lines of coincided with fault and four cut lines perpendicular to fault.The acceleration peak attenuation curve along cut lines was fitted to analyse the relationship between attenuation curve and area seismic station.Take Wenchuan earthquake for an instance,the accuracy of the model is much higher than that of euqi-distance circle model and a little higher than that of four-area elliptical model.And the model is more accurate than four-area elliptical model in reflecting hanging and foot wall effect and direction effect.
引文
[1]杨帆.罗奇峰.基于4区域椭圆模型的汶川8.0级地震加速度峰值衰减关系拟合[J].振动与冲击.2010,29(5):136-140.YANG FAN,LUO QI-FENG.Wenchuan8.0 magnitudeearthquake acceleration peak attenuation curve usingfour-area elliptical mode[J].Journal of Vibration andShock,2010,29(5):136-140.
[2]陶夏新.孙晓丹.陶正如.对新一代地震动衰减关系研究看法[C]//第七届全国地震工程学术会议论文集.2006.
[3]ABRAHAMSON N A,YOUNGS R R.(1992).A stablealgorithm for regression analyses using the randomeffects model Bull[J].Seism.Soc.Am.1992,82:505-510.
[4]CAMPBELL K W,BOZORGNIA Y.Campbell-Bozorgnia next generation attenuation(NGA)relationsfor PGA,PGV and spectral acceleration:A progressreport[C]//Proc.of the 8th U.S.National Conf onEarthquake Engineering(8NCEE),San Francisco,USA,2006.
[5]CHIOU B,DARRAGH R,SILVA W.An overview ofthe NGA strong-motion dataset[C]//Abstracts of theCentennial Meeting of the Seismological Society of A-merica,San Francisco,2006.
[6]CHIOU B,R YOUNGS.PEER-NGA empirical groundmotion model for horizontal spectral accelerations fromearthquakesin active tectonic regions[C]//Abstracts ofthe Centennial Meeting of the Seismological Society ofAmerica,San F rancisco,USA,2006.
[7]POWER M,BCHIOU N A BRAHMSON,ROBLEE C.The“Next generation of ground motion attenuationmodels”(NGA)project[C]//An Overview,Proc.of the8th U.S.National Conf.on Earthquake Engineering(8NCEE),San Francisco,USA,2006.
[8]地震工程与工程振动编辑委员会.汶川8.0级地震工程震害概览[M].北京:科学出版社,2008,10:15-20.
[9]Laubenbacher R,Pengelley D.MathematicalExpeditions[M].New York:Springer-VerlagInc,1999.
[10]中国地震局震害防御司.汶川8.0级地震未校正加速度记录[M].北京:地震出版社.2008.9.
[11]CAMPBELL K W.1981.Near 2 source attenuation ofpeak ho rizontal acceleration[J].BSSA,1981,71(6):2039-2074.
[12]雷建成,高孟潭,俞言详.四川及临区地震动衰减关系[J].地震学报,2007.29(5):500-511.LEI JIAN-CHEN,GAO MENG-TAN,YU YAN-XIANG.Seismic motion attenuation relations in sichuanand adjacent areas[J].Acta Seisologica Sinica,2007,29(5):500-511.
[13]黄慧华.近源地震动峰值加速度衰减关系影响因素分析[J].工程地质学报,1998.6(1):38-41.HUANG HUI-HUA.Analysis of influence of factors onattenutiion relation of near source ground motion peakacceleration[J].Journal of Engineering Geology,1998,6(1):61-66.
[14]Cornell C A.Engineer Seismic Risk Analysis[J].BSSA,1968,58(5):1583-1606.
[15]姜慧.新疆地震烈度的椭圆衰减关系研究[J].高原地震,15(4):47-50.JIANG HUI.Study on the elliptic attenution of seismicintensity in xinjiang[J].Earthquake Research InPlateau,1993,5(4)90:96.
[2]陶夏新.孙晓丹.陶正如.对新一代地震动衰减关系研究看法[C]//第七届全国地震工程学术会议论文集.2006.
[3]ABRAHAMSON N A,YOUNGS R R.(1992).A stablealgorithm for regression analyses using the randomeffects model Bull[J].Seism.Soc.Am.1992,82:505-510.
[4]CAMPBELL K W,BOZORGNIA Y.Campbell-Bozorgnia next generation attenuation(NGA)relationsfor PGA,PGV and spectral acceleration:A progressreport[C]//Proc.of the 8th U.S.National Conf onEarthquake Engineering(8NCEE),San Francisco,USA,2006.
[5]CHIOU B,DARRAGH R,SILVA W.An overview ofthe NGA strong-motion dataset[C]//Abstracts of theCentennial Meeting of the Seismological Society of A-merica,San Francisco,2006.
[6]CHIOU B,R YOUNGS.PEER-NGA empirical groundmotion model for horizontal spectral accelerations fromearthquakesin active tectonic regions[C]//Abstracts ofthe Centennial Meeting of the Seismological Society ofAmerica,San F rancisco,USA,2006.
[7]POWER M,BCHIOU N A BRAHMSON,ROBLEE C.The“Next generation of ground motion attenuationmodels”(NGA)project[C]//An Overview,Proc.of the8th U.S.National Conf.on Earthquake Engineering(8NCEE),San Francisco,USA,2006.
[8]地震工程与工程振动编辑委员会.汶川8.0级地震工程震害概览[M].北京:科学出版社,2008,10:15-20.
[9]Laubenbacher R,Pengelley D.MathematicalExpeditions[M].New York:Springer-VerlagInc,1999.
[10]中国地震局震害防御司.汶川8.0级地震未校正加速度记录[M].北京:地震出版社.2008.9.
[11]CAMPBELL K W.1981.Near 2 source attenuation ofpeak ho rizontal acceleration[J].BSSA,1981,71(6):2039-2074.
[12]雷建成,高孟潭,俞言详.四川及临区地震动衰减关系[J].地震学报,2007.29(5):500-511.LEI JIAN-CHEN,GAO MENG-TAN,YU YAN-XIANG.Seismic motion attenuation relations in sichuanand adjacent areas[J].Acta Seisologica Sinica,2007,29(5):500-511.
[13]黄慧华.近源地震动峰值加速度衰减关系影响因素分析[J].工程地质学报,1998.6(1):38-41.HUANG HUI-HUA.Analysis of influence of factors onattenutiion relation of near source ground motion peakacceleration[J].Journal of Engineering Geology,1998,6(1):61-66.
[14]Cornell C A.Engineer Seismic Risk Analysis[J].BSSA,1968,58(5):1583-1606.
[15]姜慧.新疆地震烈度的椭圆衰减关系研究[J].高原地震,15(4):47-50.JIANG HUI.Study on the elliptic attenution of seismicintensity in xinjiang[J].Earthquake Research InPlateau,1993,5(4)90:96.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心