岩体动态应力在地震机理中的作用研究
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摘要
根据冲击动力学理论,采用三维动态有限元方法,模拟研究了地壳中的冲击波对地震触发的影响。自然 界中随机载荷产生的冲击波导致了库仑应力的减小,引发块体间(或块体内)的错动,因而在地震的触发中,动态应 力起很大的作用。
According to the impact dynamics theory,a 3-D dynamic FEM model is used to simulate the effect of the crustal impact waves on the earthquake triggering.The impact waves resulted from stochastic load lead to the decrease of the equivalent Coulomb stress, which results in the dislocation between the crust blocks(or within a block).Consequently,it is concluded that the dynamic stress plays an important role on the earthquake triggering.
According to the impact dynamics theory,a 3-D dynamic FEM model is used to simulate the effect of the crustal impact waves on the earthquake triggering.The impact waves resulted from stochastic load lead to the decrease of the equivalent Coulomb stress, which results in the dislocation between the crust blocks(or within a block).Consequently,it is concluded that the dynamic stress plays an important role on the earthquake triggering.
引文
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6 WanYongge,WuZhongliang,etal..Researchonseismic stresstriggering[J].ActaSeismologicaSinia,2002,24(5):533-551.(inChinese)
7 汪素云,高阿甲,等.青藏高原东北地区地震重新定位及其活动特征[J].地震学报,2000,22(3):241～248.
7 WangSuyun,GaoAjia,etal.Relocationoftheearth quakesinnortheasternregionofQinghaiXizangplateau andcharacteristicsofearthquakeactivity[J].ActaSeis mologicaSinia,2000,22(3):241-248.(inChinese)
2 郑文衡,王乘,等.地壳块体脉冲响应的时间反转效应研究[J].地震学报,2001,23(4):370～379.
2 ZhengWenheng,WangCheng,etal.Thetimereversal effectoftheimpulseresponseofcrust[J].ActaSeis mologicaSinia,2001,23(4):370-379.(inChinese)
3 LiangSMandLiaoCY.Numericalsimulationofblast wavereflectionoverwedgeusingahigh orderscheme[J].2002,34(1):69-74.
4 郑文衡,王乘,何振,等.地壳对海洋潮汐的响应[J].大地 测量与地球动力学,2002,22(2)41～46.(英)
4 ZhengWenheng,WangCheng,HeZhen,etal.Response ofcrusttooceantide[J].JournalofGeodesyandGeody namics,2002,22(2):41-46.
5 唐春安,徐小荷.岩石破裂的前兆变形率、前兆应力降及临震前兆[J].地壳形变与地震,1990,10(3):12～18.
5 TangChunanandXuXiaohe.Precursorydeformation rateandstressdropinruptureexperimentsofbrittle rocksandearthquakeprecursory[J].CrustalDeforma tionandEarthquake,1990,10(3):12-18.(inChinese)
6 万永革,吴忠良,等.地震应力触发研究[J].地震学报,2002,24(5):533～551.
6 WanYongge,WuZhongliang,etal..Researchonseismic stresstriggering[J].ActaSeismologicaSinia,2002,24(5):533-551.(inChinese)
7 汪素云,高阿甲,等.青藏高原东北地区地震重新定位及其活动特征[J].地震学报,2000,22(3):241～248.
7 WangSuyun,GaoAjia,etal.Relocationoftheearth quakesinnortheasternregionofQinghaiXizangplateau andcharacteristicsofearthquakeactivity[J].ActaSeis mologicaSinia,2000,22(3):241-248.(inChinese)
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