摩擦状态速率依从的区域地震触发模型研究
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摘要
设计一个具有摩擦状态 速率依从机制模拟大地震后区域触发地震的模型,该模型由一定数量表示地震成核断层的函数组成。大震对区域静应力场的影响由应力阶跃载荷表现,利用摩擦状态 速率依从的一维自由度弹簧滑块模型结果计算地震发生时间提前。结果表明,施加幅度为地震应力降几十分之一至百分之一的应力阶跃,可以引起地震发生速率的明显变化,该变化通过统计检验,与大地震后的区域触发地震活动相似。
A frictional state-velocity dependent model was designed to study regional seismicity triggered by big earthquakes, which consisted of a number of functions representing the seismic nucleation faults. The effect of regional stress caused by big events was presented by stress step load, and a one-dimension frictional state-velocity dependent model of free string-block was used to estimate the advanced occurring time of events. The results show that remarkable change of seismicity could be detected while a stress load with amplitude one to several percents of stress drop was added, which was similar to the regional seismicity triggered by a big event. Change of the seismicity was proved to be significant by statistical test.
A frictional state-velocity dependent model was designed to study regional seismicity triggered by big earthquakes, which consisted of a number of functions representing the seismic nucleation faults. The effect of regional stress caused by big events was presented by stress step load, and a one-dimension frictional state-velocity dependent model of free string-block was used to estimate the advanced occurring time of events. The results show that remarkable change of seismicity could be detected while a stress load with amplitude one to several percents of stress drop was added, which was similar to the regional seismicity triggered by a big event. Change of the seismicity was proved to be significant by statistical test.
引文
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[2] 刘桂萍,傅征祥.日本1995年1月17日兵库县南部7.2级地震触发的区域地震活动[J].地震学报,1999,21(3):250 257.
[3] 刘桂萍,傅征祥.1976年7月28日唐山7.8级地震触发的区域地震活动和静应力场变化[J].地震学报,2000,22(1):17 26.
[4] ReasenbergPA,SimponRW.ResponseofregionalseismicitytothestaticstresschangeproducedbytheLomaPrietaEarthquake[J].Science,1992,255:1687 1690.
[5] KingGCP,SteinRS,LinJ.StaticstresschangeandthetriggeringofEarthquake[J].BullSeismSocAmer,1994,84,935 953.
[6] ManabuH.StaticstresschangeassociatedwiththeKobeearthquake:CalculationofchangesinCoulombFailureFunctionandcomparisonwithseismcitychange[J].Earthquake(Japan),1995,48(2):521 530.
[7] HarrisRA.Introductiontospecialsectionstresstriggers,stressshadows,andimplicationsfroseismicharzard[J].JournalofGeophysicalResearch,1998,103(B10):24347 24358.
[8] GombergJ,BeelerNM,BlanpiedML,BodinP.Earthquaketriggeringbytransientandstaticdeformation[J].JGeophysRes,1998,103(B10):24411 24426.
[9] DieterichJH.Earthquakeonfaultswithrateandstate dependentfriction.Tectonophysics.1992,211:115 134.
[10] DieterichJH.Aconstitutivelawforrateofearthquakeproductionanditsapplicationtoearthquakeclustering[J].JGeophysRes,1994,99,B2,2601 1618.
[11] ScholzCH.Themechanicsofearthquakeandfaulting[M].CambridgeUniversityPress,1990.
[12] DieterichJH.Time dependentfrictionandthemechanicsofstick slip[J].PAGEOPH,1978,116:790 805.
[13] JaegerCJ,CookNGW.Fundamentalofrockmechanics[M].ChapmanandHall,Lodoon,1976.
[14] ScholzCH.Scalingrelationsforstronggroundmotioninlargeearthquakes[J].BullSeismolSocAm,1982,72:1903 1909.
[15] GutenbergB,CFRichter.Earthquakemagnitude,intensity,energyandacceleration[J].BullSeismolSocAm,1956,46:105 145.
[16] MeyerSL.Dataanalysisforscientistsandengineer.JohnWiley＆SonsNewYork[M].1975,235.
[17] HabermannRE.TeleseismicdetectionintheAleutianIslandArc[J].JGeophysRes,1983,88:50565064.
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