随机点源方法和随机有限断层方法模拟地震动的比较
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摘要
在对用随机点源方法模拟地震动和随机有限断层方法模拟地震动比较的基础上,介绍了2种方法的局限性和优越性。分别用2种方法对卢龙和宁河地震进行了模拟结果表明:用随机点源方法模拟结果仅在某些频段与记录符合得比较好,而在其它频段内与记录符合得不好;用随机有限断层模型方法模拟结果无论在低频还是在高频都与记录符合得很好。因此加强研究中国大陆的地震动经验关系对提高随机点源方法在中国大陆的适用性是有益的,用有限断层方法模拟地震动的结果与记录符合得比较好,说明现在可以用该方法大量地模拟中国大陆地震动。
On the basis of comparison between stochastic point-source method and stochastic finite-fault method,limitation and advantage of the two method are introduced.The computational results for simulating Lulong and Ninghe earthquake by two methods are shown that simulations obtained from the stochastic point-source method are only consistent with records in some frequency,and are not consistent each other in other frequencies,and that simulations obtained from stochastic finite-fault method are consistent well with records both in bands of high and low frequency.It is beneficial to investigate the empirical relation of Chinese continent in order to enhance the applicability of stochastic point-source method in Chinese main land.It is incentive to simulate Chinese earthquake with stochastic finite-fault method substantially becouse simulations with this method are consistent with records very well.
On the basis of comparison between stochastic point-source method and stochastic finite-fault method,limitation and advantage of the two method are introduced.The computational results for simulating Lulong and Ninghe earthquake by two methods are shown that simulations obtained from the stochastic point-source method are only consistent with records in some frequency,and are not consistent each other in other frequencies,and that simulations obtained from stochastic finite-fault method are consistent well with records both in bands of high and low frequency.It is beneficial to investigate the empirical relation of Chinese continent in order to enhance the applicability of stochastic point-source method in Chinese main land.It is incentive to simulate Chinese earthquake with stochastic finite-fault method substantially becouse simulations with this method are consistent with records very well.
引文
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[2]Motazedian D,Atkinson G M.Stochastic finite-fault modeling based on a dynamic corner frequency[J].BSSA,2005,95(3):995-1010.
[3]Hartzell S H.Earthquake aftershocks as Green’s functions[J].Geophys.Res.Letters,1978,5(1):1-4.
[4]Brune J N.Tectonic stress and the spectra of seismic shear waves from earthquakes[J].J.Geophys.Res.,1970,75(26):4997-5009.
[5]Brune J N.Correction[J].J.Geophys.Res.,1971,76(20):5002.
[6]Wells D,Coppersmith K.New empirical relationships among magnitude,rupture length,rupture width,rupture area and surface displacement[J].BSSA,1994,84(4):974-1002.
[7]Berenev I,Atkinson G.Stochastic finite-fault modeling of ground motions from the 1994 Northridge,California earthquake.I.validation onrock sites[J].BSSA,1998b,88(6):1392-1401.
[8]BerenevⅠ,Atkinson G.Subevent structure of large earthquakes-a ground motion perspective[J].Geophys.Res.L.,2001,28(1):53-56.
[9]Heaton TH.Evidence for and implications of self-healing pulses of slip in earthquake rupture[J].Phys.Earth Planet.Interiors,1990,64(1):1-20.
[10]Wald D J,Heaton TH,Hudnut K W.The slip history of the 1994 Northridge,California,Earthquake determined from strong motion,teleseis-mic,GPS,and leveling data[J].BSSA,1996,86(1B):S49-S70.
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