1604年福建泉州海外地震震级和震源参数的探讨——基于强地震动数值模拟方法
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摘要
根据历史资料和已有的研究成果,利用两种地震动数值模拟方法对1604年福建泉州海外地震震级和震源参数进行了研究。首先利用经验公式确定了该次地震震级为71/2级和8级时的震源参数,然后基于离散波数法和有限断层地震动随机合成法,并利用基岩与一般场地水平峰值加速度的对应关系,计算了福建沿海8个场点的加速度、速度时程及其峰值,发现:当震级为71/2级时,结果与调查得到的等震线图吻合较好;震级为8级时,吻合程度不高。而后,又采用有限元方法并利用福州盆地的三维地下结构模型,计算了其中2个场点的加速度和速度,结果一致。因此认为:这次地震的震级为71/2级较合理,采用的震源模型也是可行的。
According to the historical data and existed research results,the paper uses two numerical simulations of strong ground motion to research magnitude and focal shock parameter on the 1604 great earthquake in the marine area near Quanzhou.The paper first confirms the magnitude and focal shock parameter.Then,the article employs empirical equation to determinate the focal shock parameter with M8.0 and M71/2,get acceleration and velocity time histories and peak of eight points by the combination of the Discrete Wavenumber/Finite Element and stochastic synthesis of ground motion of finite-fault modeling with corresponding relationship between bedrock peak acceleration and site peak acceleration.Results show that M71/2 is consistent with isoseismic map,but not for M8.0 and rationality of the source models.Finally,the paper obtains the results of A and B points by 3-D FEM in Fuzhou basin.The conclusion is consistent with the above one.
According to the historical data and existed research results,the paper uses two numerical simulations of strong ground motion to research magnitude and focal shock parameter on the 1604 great earthquake in the marine area near Quanzhou.The paper first confirms the magnitude and focal shock parameter.Then,the article employs empirical equation to determinate the focal shock parameter with M8.0 and M71/2,get acceleration and velocity time histories and peak of eight points by the combination of the Discrete Wavenumber/Finite Element and stochastic synthesis of ground motion of finite-fault modeling with corresponding relationship between bedrock peak acceleration and site peak acceleration.Results show that M71/2 is consistent with isoseismic map,but not for M8.0 and rationality of the source models.Finally,the paper obtains the results of A and B points by 3-D FEM in Fuzhou basin.The conclusion is consistent with the above one.
引文
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[2]陈晨.福建地区地震活动空间分布及活动断裂特点研究[J.]地震,2005,25(3):102-108.
[3]李小邨.初探1604年福建泉州海外71/2级大震的人员伤亡问题[J.]华南地震,2007,27(4):88-94.
[4]许振栋.1604年泉州海外8级地震研究[J.]大地测量与地球动力学,2006,26(3):79-83.
[5]朱金芳,徐锡伟,黄宗林,等.福州市活断层探测与地震危险性评价[M.]北京:科学出版社,2004.
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[8]徐辉龙,叶春明,丘学林等.南海北部滨海断裂带的深部地球物理探测及其发震构造研究[J.]华南地震,2010,30(supp):10-17.
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[13]王国新,史家平.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,2008,24(2):4-10.
[14]GB/T 17742-2008,中国地震烈度表[S.]北京:中国标准出版社,2008.
[15]廖其林,王振明,王屏路,等.福州一泉州一汕头地区地壳结构的爆炸地震研究[J.]地球物理学报,1988,31(3):270-280.
[16]Spudich P,Xu L S.Software for calculating earthquake ground motions from finite faults in vertically varyingmedia[A.]Lee H K,Kanamori H,Paul C,et al.International Handbook of Earthquakeand EngineeringSeismology(Part B)[C].Santigo:IASPEI,2003.
[17]Boore,D.M.Stochastic simulation of high-frequency ground motions based on seismological models of theradiated spectra[J].Bull.Seism.Soc.Am.1983,73:1865-1894.
[18]卢寿德.工程场地地震安全性评价(GB 17741-2005)宣贯教材[M].北京:地震出版社,2006.
[19]丁海平,刘启方,金星.长周期地震动三维有限元数值模拟方法[J].地震工程与工程振动,2006,26(5):27-31.
[20]刘启方,丁海平.近断层地震动预测实例[J].地震工程与工程振动,2008,28(6):28-32.
[2]陈晨.福建地区地震活动空间分布及活动断裂特点研究[J.]地震,2005,25(3):102-108.
[3]李小邨.初探1604年福建泉州海外71/2级大震的人员伤亡问题[J.]华南地震,2007,27(4):88-94.
[4]许振栋.1604年泉州海外8级地震研究[J.]大地测量与地球动力学,2006,26(3):79-83.
[5]朱金芳,徐锡伟,黄宗林,等.福州市活断层探测与地震危险性评价[M.]北京:科学出版社,2004.
[6]丁祥焕.福建东南沿海活动断裂与地震[M.]福州:福建科学技术出版社,1999.
[7]黄昭,王善雄.台湾海峡滨海断裂带的构造特征与活动性[J.]大地测量与地球动力学,2006,26(3):16-22.
[8]徐辉龙,叶春明,丘学林等.南海北部滨海断裂带的深部地球物理探测及其发震构造研究[J.]华南地震,2010,30(supp):10-17.
[9]吴维灿.1604年福建泉州8级大震[A.]国家地震局.中国特大地震研究[C.]北京:地震出版社,1988.
[10]Donald L.Wells,KevinJ.Coppersmith.New Empirical Relationships among Magnitude,Rupture Length,Rupture Width,Rupture Area,and Surface Displacement[J.]Bulletin of the Seismological Society ofAmerica,1994,84(4):974-1002.
[11]Paul Somerville,Kojiro Irikura,et al.Characterizing Crustal Earthquake Slip Models for the Prediction ofStrong Ground Motion[J.]Seismological Research Letters,1999,70(1):59-80.
[12]万永革,吴忠良,周公威,等.根据震源的两个节面的走向角和倾角求滑动角[J.]地震地磁观测与研究,2000,21(5):26-30.
[13]王国新,史家平.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,2008,24(2):4-10.
[14]GB/T 17742-2008,中国地震烈度表[S.]北京:中国标准出版社,2008.
[15]廖其林,王振明,王屏路,等.福州一泉州一汕头地区地壳结构的爆炸地震研究[J.]地球物理学报,1988,31(3):270-280.
[16]Spudich P,Xu L S.Software for calculating earthquake ground motions from finite faults in vertically varyingmedia[A.]Lee H K,Kanamori H,Paul C,et al.International Handbook of Earthquakeand EngineeringSeismology(Part B)[C].Santigo:IASPEI,2003.
[17]Boore,D.M.Stochastic simulation of high-frequency ground motions based on seismological models of theradiated spectra[J].Bull.Seism.Soc.Am.1983,73:1865-1894.
[18]卢寿德.工程场地地震安全性评价(GB 17741-2005)宣贯教材[M].北京:地震出版社,2006.
[19]丁海平,刘启方,金星.长周期地震动三维有限元数值模拟方法[J].地震工程与工程振动,2006,26(5):27-31.
[20]刘启方,丁海平.近断层地震动预测实例[J].地震工程与工程振动,2008,28(6):28-32.
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