地震研究

基于动力学拐角频率的随机有限断层模型,以1976年唐山大地震的极震区为研究目标,通过梳理前人的研究成果,建立了目标区的计算模型并确定了震源模型参数,依靠目标区的局部场地资料和场地动力学参数,利用四分之一波长法,获取局部场地放大效应参数; 利用随机有限断层模型地震动模拟方法,给出了唐山大地震近场强地震动场模拟结果,并与历史地震宏观烈度进行对比,结果表明:在Ⅷ、Ⅸ度影响烈度的范围与宏观资料吻合较好。

Based on the stochastic finite fault model of the dynamic corner frequency,we take the meizoseismal area of the Tangshan earthquake in 1976 as the research goal.The calculation model of the target zone is established and the parameters of the source model are determined by summarizing the research results of predecessors.The local site amplification is obtained by using the quarter-wavelength method based on the site condition data and soil dynamics parameters.The simulation results of the near-field strong ground motion field of the Tangshan earthquake are obtained by using the stochastic finite fault model ground motion simulation method.The results show that the ranges of VIII,IX degree simulated are similar to macro intensity comparing with the macroscopic intensity of historical earthquakes.

引言
1 随机有限断层模型方法
2 模型的建立和计算参数的确定
3 模拟结果分析
4 结论

表1 唐山地震的随机有限断层模型参数<br/>Tab.1 Stochastic finite-fault model parameters for the Tangshan earthquake

表1 唐山地震的随机有限断层模型参数
Tab.1 Stochastic finite-fault model parameters for the Tangshan earthquake

图1 目标区唐山地震发震构造图<br/>Fig.1 Seismotectonic map of the Tangshan earthquake

图1 目标区唐山地震发震构造图
Fig.1 Seismotectonic map of the Tangshan earthquake

图2 唐山地震的子断层及滑动位移分布图(虚线范围为破裂起始区)<br/>Fig.2 Sub-faults and the slip model of the Tangshan earthquake (The dashed rectangle indicates the rupture initiating area)

图2 唐山地震的子断层及滑动位移分布图(虚线范围为破裂起始区)
Fig.2 Sub-faults and the slip model of the Tangshan earthquake (The dashed rectangle indicates the rupture initiating area)

图3 研究区钻孔分布图<br/>Fig.3 The drilling distribution map of the study area

图3 研究区钻孔分布图
Fig.3 The drilling distribution map of the study area

表2 目标区的平均放大系数Amp(f)<br/>Tab.2 Average amplification coefficient Amp(f)of the study area

表2 目标区的平均放大系数Amp(f)
Tab.2 Average amplification coefficient Amp(f)of the study area

图4 浅层剪切波速随深度的变化规律<br/>Fig.4 The variation law of shallow shear wave velocity with depth

图4 浅层剪切波速随深度的变化规律
Fig.4 The variation law of shallow shear wave velocity with depth

图5 随机有限断层模型地震动场模拟结果<br/>Fig.5 The simulation results of ground motion field based on the stochastic finite fault model

图5 随机有限断层模型地震动场模拟结果
Fig.5 The simulation results of ground motion field based on the stochastic finite fault model

图6 模拟烈度等值线与唐山地震宏观影响烈度对比图<br/>Fig.6 Comparison of simulated intensity and macroscopic intensity of the Tangshan earthquake

图6 模拟烈度等值线与唐山地震宏观影响烈度对比图
Fig.6 Comparison of simulated intensity and macroscopic intensity of the Tangshan earthquake

蔡永恩,何涛,王仁.1999.1976年唐山地震震源动力过程的数值模拟[J].地震学报,21(5):469-477.
常莹,周红,俞言祥.2012.汶川地震强地面运动模拟[J].地震学报,34(2):224-234.
陈运泰,林邦慧,王新华,等.1979.用大地测量资料反演的1976唐山地震的位错模式[J].地球物理学报,22(3):201-217.
杜晨晓,谢富仁,张扬,等.2010.1976年MS7.8唐山地震断层动态破裂及近断层强地面运动特质[J].地球物理学报,53(2):290-304..
国家地震局.1982.一九七六唐山地震[M].北京:地震出版社,31-130.
郭慧,江娃利,谢新生.2011.对1976年河北唐山MS7.8地震地表破裂带展布及位移特征的新认识[J].地震地质,33(3):506-524.
黄聪.2013.基于PGA的地震紧急处置有效预警时间研究[D].哈尔滨:中国地震局工程力学研究所.
拉巴次仁.2013.随机有限断层方法模拟地震动[J].华中师范大学学报(自然科学版),47(4):583-586.
李启成,池红岩,宋志勇.2012.卢龙地震动场的预测[J].地震研究,35(2):240-245.
刘海明,陶夏新,孙晓丹,等.2010.马衔山北缘断裂西段地震动场估计的震源模型[J].世界地震工程,26(3):60-66.
刘启方,李雪强.2011.唐山大地震近场宽频带地震动模拟[J].地震工程与工程振动,31(5):1-7.
罗奇峰,胡聿贤.1997.1976年唐山地震近、远场加速度的半经验合成[J].地震学报,19(3):275-282.
申文豪,仲秋,刘博研,等.2013.基于改进的随机有限断层模型进行区域烈度速报[J].地球物理学进展,28(2):695-705.
盛俭,薄景山,佴磊,等.2012.近断层地震动场预测——以长春市为例[J].地震工程与工程振动,32(2):48-53.
孙晓丹,王罡,刘成清.2013.芦山地震有限断层混合震源模型模拟[J].地震工程与工程振动,33(4):15-20.
陶夏新,王国新.2003.近场强地震动模拟中对破裂的方向性效应和上盘效应的表达[J].地震学报,25(2):191-198.
王国新,史家平.2008.近场强地震动合成方法研究及地震动模拟[J].东北地震研究,24(2):4-10.
王国新,史家平.2009.随机有限断层法在汶川强地震动模拟中的应用[J].自然科学进展,19(6):664-669.
王海云.2010.2010年4月14日玉树MS7.1地震加速度场预测[J].地球物理学报,53(10):2345～2354.
王卫民,赵连峰,李娟,等.2008.四川汶川8.0级地震震源过程[J].地球物理学报,51(5):1403-1410.
王振宇.2017.高频地震动随机模拟方法研究[D].哈尔滨:中国地震局工程力学研究所.
魏勇,崔建文,王秋良,等.2018.基于合成地震动的2014年鲁甸MS6.5地震场地效应分析[J].地震研究,41(1):32-37.
谢礼立,张敏政,曲传军.1994.唐山主震近场地震动的模拟[J].地震工程与工程振动,14(3):1-10.
张翠然,陈厚群,李敏.2011.采用随机有限断层法生成最大可信地震[J].水利学报,42(6):721-728.
张冬峰,付长华,吕红山,等.2018.随机有限断层法及其工程应用中的问题分析[J].震灾防御技术,13(4):784-800.
张之立,王成宝,方兴,等.1989.唐山地震破裂过程的雁行断裂模式及理论和试验的模拟[J].地震学报,11(3):291-302.
赵翠萍,陈章立,华卫,等.2011.中国大陆主要地震活动区中小地震震源参数研究[J].地球物理学报,54(6):1478-1489.
Aki K.1968.Seismic displacements near a fault[J].Journal of Geophysical Research,73(16):5359-5376.
Atkinson G M,Boore D M.1995.Ground-motion relations for Eastern North America[J].Bulletin of the Seismological Society of America,85(1):17-30.
Atkinson G M,Sonley E.2000.Empirical relationships between modified Mercalli intensity and response spectra[J].Bulletin of the Seismological Society of America,90(2):537-544.
Beresnev I A,Atkinson G M.1997.Modeling finite-fault radiation from the ωn spectrum[J].Bulletin of the Seismological Society of America,87(1):67-84.
Beresnev I A,Atkinson G M.1998.FINSIM--A Fortran Program for Simulating Stochastic Acceleration Time Histories from Finite Faults[J].Seismological Research Letters,69(1):27-32.
Beresnev I A,Atkinson G M.2002.Source parameters of earthquakes in eastern and western North America based on finite-fault modeling[J].Bulletin of the Seismological Society of America,92(2):695-710.
Boore D M,Joyner W B.1997.Site amplifications for generic rock sites[J].Bulletin of Seismological Society of America,87(2):327-341.
Boore D M.2003.Simulation of ground motion using the stochastic method[J].Pure and Applied Geophysics,160(3):635-676.
Boore D M.2013.The uses and limitations of the square-root-impedance method for computing site amplification[J].Bulletin of the Seismological Society of America,103(4):2356-2368.
Dan K,Ishii T,Ebihara M.1993.Estimation of strong ground motions in meizoseismal region of the 1976 Tangshan,China,Earthquake[J].Bulletin of the Seismological Society of America,83(6):1756-1777.
Hartzell S.1978.Earthquake aftershock as Green's function[J].Geophysical Research Letters,5(1):1-4.
Irikura K.1983.Semi-empirical estimation of strong ground motions during large earthquake[J].Bull Disas Prev Res Inst,Kyoto Univ.,35(2):63-104.
Joyner W B,Warrick R E,Fumal T E.1981.The effect of quaternary alluvium on strong ground motion in the Coyote Lake,California,Earthquake of 1979[J].Bulletin of the Seismological Society of America,71(4):1333-1349.
Motazedian D,Atkinson G M.2005.Stochastic finite-fault modeling based on a dynamic corner frequency[J].Bulletin of the Seismological Society of America,95(3):995-1010.
Pacor F,Cultrera G,Mendez A et al.2005.Finite fault modeling of strong ground motions using a hybrid deterministic-stochastic approach[J].Bulletin of the Seismological Society of America,95(1):225-240.
Robinson R,Zhou S.2005.Stress interactions within the Tangshan,China,Earthquake Sequence[J].Bulletin of the Seismological Society of America,95(6):2501-2505.
Roten D,Olsen K,Pechmann J.2012.3D simulations of M7 earthquakes on the Wasatch Fault,Utah,part II:broadband(0-10Hz)ground motions and nonlinear soil behavior[J].Bulletin of the Seismological Society of America,102(5):2008-2030.
Worden C B,Gerstenberger M C,Rhoades D A,et al.2012.Probabilistic relationships between ground-motion parameters and modified Mercalli intensity in California[J].Bulletin of the Seismological Society of America,102(1):204-221.
Zeng Y,Anderson J G,Yu G.1994.A composite source model for computing realistic synthetic strong ground motions[J].Geophysical Research Letters,21(8):725-728.
GB/T 17742—2008中国地震烈度表[S].

备注

引言

1 随机有限断层模型方法

2 模型的建立和计算参数的确定

3 模拟结果分析

4 结论

期刊信息