地震动随机合成中与震源谱相关的动力学拐角频率
|
摘要
介绍了基于有限断层震源的地震动随机合成中静力学拐角频率和动力学拐角频率,讨论了两者的缺点;进而提出了一种改进的震源谱模型,它能够表达破裂面上地震波频率辐射不均匀性、大震时拐角频率随破裂面积增加而有所下降的趋势.据此,可以形成与该震源谱模型相关联的动力学拐角频率,应用于地震动的随机合成,避免结果对子源尺寸的依赖.通过对美国北岭MW6.7地震近场6个基岩台站合成的地震动与实际记录的比较,验证了本文方法的有效性.
The static corner frequency and dynamic corner frequency in stochastic synthesis of ground motion of finite-fault modeling are introduced, and conceptual disadvantages of the two are discussed. This paper proposes a source spectral model, which is capable of representing the non-uniform radiation of seismic wave on the fault plane and the trend of reduced corner frequency for enlarged rupture area. A new dynamic corner frequency can be drawn out directly from the model. The dependence of ground motion on the size of sub-faults can be eliminated if this source spectral model is adopted in the synthesis. Finally, the proposed approach is validated by comparing the synthesized and observed ground motions at 6 rock-base stations during the 1994 Northridge earthquake in United States.
The static corner frequency and dynamic corner frequency in stochastic synthesis of ground motion of finite-fault modeling are introduced, and conceptual disadvantages of the two are discussed. This paper proposes a source spectral model, which is capable of representing the non-uniform radiation of seismic wave on the fault plane and the trend of reduced corner frequency for enlarged rupture area. A new dynamic corner frequency can be drawn out directly from the model. The dependence of ground motion on the size of sub-faults can be eliminated if this source spectral model is adopted in the synthesis. Finally, the proposed approach is validated by comparing the synthesized and observed ground motions at 6 rock-base stations during the 1994 Northridge earthquake in United States.
引文
王国新.2001.强地震动衰减研究[D].哈尔滨:中国地震局工程力学研究所:70--71.
王海云.2004.近场强地震动预测的有限断层震源模型[D].哈尔滨:中国地震局工程力学研究所:27--83.
郑天愉,姚振兴.1993.用近场记录研究唐山地震的震源过程[J].地球物理学报,36(2):174--184.
Beresnev I A,Atkinson G.1997.Modelingfinite-fault radiationfromtheωnspectrum[J].Bull SeismSoc Amer,87(1):67--84.
Beresnev I A,Atkinson G.1998a.Stochastic finite-fault modeling of ground motions fromthe1994Northridge,Califor-nia,earthquake,I.Validation on rock sites[J].Bull Seism Soc Amer,88(6):1392--1401.
Beresnev I A,Atkinson G.1998b.FI NSI M-a FORTRAN Programfor si mulating stochastic acceleration ti me historiesfromfinite faults[J].SeismRes Lett,69(1):27--32.
Boatwright J,Choy G.1992.Acceleration source spectra anticipatedfor large earthquakesin Northeastern North Ameri-ca[J].Bull Seism Soc Amer,82:660--682.
Boore D.1983.Stochastic si mulation of high-frequency ground motions based on seismological models of the radiatedspectra[J].Bull Seism Soc Amer,73:1865--1894.
Boore D M,Joyner WB.1997.Site amplifications for generic rock sites[J].Bull Seism Soc Amer,87:327--341.
Boore D M.2003.Si mulation of ground motion using the stochastic method[J].Pure Appl Geophys,160:635--676.
Gutenberg B,Richter C F.1956.Magnitude and energy of earthquakes[J].Ann Geofis,9:1--15.
Hanks T C,Kanamori H.1979.A moment-magnitude scale[J].J Geophys Res,84:2348--2350.
Hirasawa T,Stauder W.1965.On the seismic body waves froma finite moving source[J].Bull Seism Soc Amer,55:237--262.
Hough S,Dreger D.1995.Source parameters of the23April1992M6.1Joshua Tree,California,earthquake andits af-tershocks:Empirical Green’s function analysis of GEOS and TERRAscope data[J].Bull Seism Soc Amer,85:1576--1590.
Kanamori H,Anderson D L.1975.Theoretical basis of some empirical relationsin seismology[J].Bull SeismSoc Amer,65:1073--1096.
Miyake H,Iwata T,Irikura K.2003.Source characterizationfor broadband ground-motion si mulation:Kinematic heter-ogeneous source model and strong motion generation area[J].Bull Seism Soc Amer,93(6):2531--2545.
Motazedian D,Atkinson G M.2002.Dynamic corner frequency:A new concept in stochastic finite fault modeling[C/OL].Victoria,British Columbia:Seismological Society of America Meeting.[2008-12-25].http:∥http-server.carleton.cal~dariush/research/SSA2002.pdf.
Motazedian D,Atkinson G M.2005.Stochastic finite-fault modeling based on a dynamic corner frequency[J].BullSeism Soc Amer,95(3):995--1010.
Sato R.1979.Theoretical basis on relationships between focal parameters and earthquake magnitude[J].J Phys Earth,27:353--372.
Somerville P G,Irikura K,Graves R W,Wald D,Abrahamson N,Iwasaki Y,Kagawa T,Smith N,Kowada A.1999.Characterizing crustal earthquake slip models for the prediction of strong ground motion[J].SeismRes Lett,70(1):59--80.
Sun X D,Tao X X.2008.Superposition of ground motions at lowand highfrequenciesin synthesis[C]∥The14thWorldConference on Earthquake Engineering.Beijing,China.S02-003.
Wells D L,Coppersmith KJ.1994.Newempirical relationships among magnitude,rupture length,rupture width rup-ture area,and surface displacement[J].Bull Seism Soc Amer,84(4):974--1002.
王海云.2004.近场强地震动预测的有限断层震源模型[D].哈尔滨:中国地震局工程力学研究所:27--83.
郑天愉,姚振兴.1993.用近场记录研究唐山地震的震源过程[J].地球物理学报,36(2):174--184.
Beresnev I A,Atkinson G.1997.Modelingfinite-fault radiationfromtheωnspectrum[J].Bull SeismSoc Amer,87(1):67--84.
Beresnev I A,Atkinson G.1998a.Stochastic finite-fault modeling of ground motions fromthe1994Northridge,Califor-nia,earthquake,I.Validation on rock sites[J].Bull Seism Soc Amer,88(6):1392--1401.
Beresnev I A,Atkinson G.1998b.FI NSI M-a FORTRAN Programfor si mulating stochastic acceleration ti me historiesfromfinite faults[J].SeismRes Lett,69(1):27--32.
Boatwright J,Choy G.1992.Acceleration source spectra anticipatedfor large earthquakesin Northeastern North Ameri-ca[J].Bull Seism Soc Amer,82:660--682.
Boore D.1983.Stochastic si mulation of high-frequency ground motions based on seismological models of the radiatedspectra[J].Bull Seism Soc Amer,73:1865--1894.
Boore D M,Joyner WB.1997.Site amplifications for generic rock sites[J].Bull Seism Soc Amer,87:327--341.
Boore D M.2003.Si mulation of ground motion using the stochastic method[J].Pure Appl Geophys,160:635--676.
Gutenberg B,Richter C F.1956.Magnitude and energy of earthquakes[J].Ann Geofis,9:1--15.
Hanks T C,Kanamori H.1979.A moment-magnitude scale[J].J Geophys Res,84:2348--2350.
Hirasawa T,Stauder W.1965.On the seismic body waves froma finite moving source[J].Bull Seism Soc Amer,55:237--262.
Hough S,Dreger D.1995.Source parameters of the23April1992M6.1Joshua Tree,California,earthquake andits af-tershocks:Empirical Green’s function analysis of GEOS and TERRAscope data[J].Bull Seism Soc Amer,85:1576--1590.
Kanamori H,Anderson D L.1975.Theoretical basis of some empirical relationsin seismology[J].Bull SeismSoc Amer,65:1073--1096.
Miyake H,Iwata T,Irikura K.2003.Source characterizationfor broadband ground-motion si mulation:Kinematic heter-ogeneous source model and strong motion generation area[J].Bull Seism Soc Amer,93(6):2531--2545.
Motazedian D,Atkinson G M.2002.Dynamic corner frequency:A new concept in stochastic finite fault modeling[C/OL].Victoria,British Columbia:Seismological Society of America Meeting.[2008-12-25].http:∥http-server.carleton.cal~dariush/research/SSA2002.pdf.
Motazedian D,Atkinson G M.2005.Stochastic finite-fault modeling based on a dynamic corner frequency[J].BullSeism Soc Amer,95(3):995--1010.
Sato R.1979.Theoretical basis on relationships between focal parameters and earthquake magnitude[J].J Phys Earth,27:353--372.
Somerville P G,Irikura K,Graves R W,Wald D,Abrahamson N,Iwasaki Y,Kagawa T,Smith N,Kowada A.1999.Characterizing crustal earthquake slip models for the prediction of strong ground motion[J].SeismRes Lett,70(1):59--80.
Sun X D,Tao X X.2008.Superposition of ground motions at lowand highfrequenciesin synthesis[C]∥The14thWorldConference on Earthquake Engineering.Beijing,China.S02-003.
Wells D L,Coppersmith KJ.1994.Newempirical relationships among magnitude,rupture length,rupture width rup-ture area,and surface displacement[J].Bull Seism Soc Amer,84(4):974--1002.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心