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Seismotectonics of the Charleston region
175A but it is common practice to provide a contact surface between elements v,ith elastic springs, dashpots,and slides for Coulomb friction. The appropriate parameters for the contact surface are varied according to the objective of the simulation. Earthquake ground motion is considered here, with attention paid to periods of ground motion, elastic wave velocity and damping. Simulated accelerograms are compared with those from model tests. 875016 Numerical method for determining the state of stress using focal mechanisms of earthquake populations: applications to Tibetan teleseisms and microseismicity of Southern Peru Carey-Gailhardis, E: Mercier, J L
Earth Planet Sci Lett I"82..V1.2, March 1987, P165-179 A numerical method is presented which allows the study of the kinematics of seismic faults in terms of stress. It assumes a uniform state of stress in the source region and is based on a simple mechanical model for fault population analysis, which supposes slip in the direction of the resolved shear stress acting on the fault plane. The simple amdysis is applied to teleseisms in Tibet and microseisms in Peru. Results suggest that major seismic events may give a good evaluation of the regional (mean) state of stress. 875017 Seismotectonics of the Charleston region Talwani, P Proc Third US National Conference on Earthquake
Fngineering, Charleston, 24-28 August 1986 I71, P15-24.Publ El Cerrito. Earthquake Engineering Research Institute Data collected in multidisciplinary examinations of the Summerville-Charleston region, South Carolina. USA, ha,,c been analysed, and possible source zones delineated and a seismotectonic model of the region developed. In the model, episodic seismicity is occurring on two buried intersecting faults in response to the prevalent tectonic stress. Data sources included historic and present seismicity, seismic reflection and refraction surveys, and gravity, aeromagnetic, geological and geodetic examinations. 875018 Strike slip on reactivated Triassic (?) basin boundary fault zones as sources of earthquakes near Charleston, S. C. Behrendt, J C; Yuan. A Proe Third US National Conference on Earthquake
Engineering, Charleston, 24-28 August 1986 171, P43-54.Publ El Cerrito. Earthquake Engbwering Research Institute Several thousand kilometers of multifold seismic reflection data of the Charleston, South Carolina, USA, area have been analysed. Results of the analysis support a long held theory' that the seismicity of this area is associated with strike slip displacements on reactivated Triassic (?) basin boundary' fault zones. A high sensitivity aeromagnetic survey provides further evidence to support this hypothesis. 875019 Overview and summary of results for the project: seismic hazard characterization for the eastern United States Savy, J B: Bernreuter, D L: Mensing, R W Proe Th&d US National Conference on Earthquake
Engineering, Charleston, 24-28 August 1986 V1, P93-103.Puhl El Cerrito Earthquake Engineering Research hlstitute Seismic hazard depends on local seismicity and attenuation of ground motion between earthquake source and site. Limited seismic hazard data exist for the eastern United States. A method developed at the Laurence Livermore National Laboratory to assess seismic hazards is presented. It is based,
as are some other models, on: (1) identi!",ing sou:-ce ,'ones: {2) describing the seismicit.~ of source zones: {3) identif.ving an appropriate ground motion model: and ¢41 estimating the hazard by a probabilistic model. The method distinguishes between uncertainties in natural e~ents and uncertainties due to lack of site data or opinions used to formulate the model. The uncertaint.,, is presented in terms o( percentile curves for peak ground acceleration and for 5°0 d,m:ping spectral ,,alt,cs. Comparisons are made with alternative hazard prediction methods. 875020 Source scaling relations of large eastern North American earthquakes and implications for ground motions Somerville, P
Proc Third US National Conference on Earthquake Engineering, Charleston, 24-28 August 1986 l"l. P177124.Publ El Cerrito. F.arthquake En,~,im.~','mg Reg'a,ch Institute Ground motion simulations require a source model to specify' the level of high frequenc? radiation in relation to the seismic moment of the source. Some characteristics for earthquakes in eastern North America are compared ~ith those for other regions and found to be consistent ~vitb, constant stress drop scaling, but inconsistent with non-coqstant scaling models. Further evidence is provided to suggest that aspects of strong ground motion amplitudes may' not be significantly' different for eastern and western North America. Differences ma.v, though, arise because of difl'crences in crustal structure, scattering, anelasticity, and local site efl'ec',s. 875021 Nonstationary stochastic models for earthquakes Safak. E; Boore, D NI
Proc Third L'S National Conference on Earthquake Engineering, Charleston, 24-28 August 1986 11. P137148.Publ El Ccrrito. Earthquake Engweering Research Institute A stochastic seismological model for ground motion, based on the physical properties of the source ar'.d the medium, is introduced, and its advantages over present empirical models demonstrated. It is shown that the commonly used uniformlymodulated filtered white noise stochastic proce_,s for ground motion simulation introduces errors ~hich result in overestimation of structural response for systems v, hose fundamental period is greater than source duratior', of the earthquake. The filtered shot-noise process is then proposed to remo',e these errors. Finally', numerical examples are presented. 875022 Time-dependent seismic hazard estimates from the New Madrid fault zone Kiremidjian. A S: Suzuki, S Proc Third US National Conference on Earthquake
Engineering. Charleston, 24-28 August 1986 1"1. PI49160.Publ El Cerrito: 1-arthquake Engim,erin,.¢ Research Institute Seismic hazard due to earthquake acti',lt,, on the New Madrid fault zone for the cities of Memphis and St. Louis, USA, has been estimated using a time depcnden, stochastic model. This "model assumes that the time to the next event is defined by the size of the last event, but the size of the next event is random. Parameters of the model are based on limtted data, and the effect of uncertainty' of these parameters is studied. Results are compared with hazard estimates based on independence assumptions of earthquake events, and the difference between the predictions is discussed.
i, 1987 Pergamon Journals Ltd. Reproduction not permitted
Earth Planet Sci Lett I"82..V1.2, March 1987, P165-179 A numerical method is presented which allows the study of the kinematics of seismic faults in terms of stress. It assumes a uniform state of stress in the source region and is based on a simple mechanical model for fault population analysis, which supposes slip in the direction of the resolved shear stress acting on the fault plane. The simple amdysis is applied to teleseisms in Tibet and microseisms in Peru. Results suggest that major seismic events may give a good evaluation of the regional (mean) state of stress. 875017 Seismotectonics of the Charleston region Talwani, P Proc Third US National Conference on Earthquake
Fngineering, Charleston, 24-28 August 1986 I71, P15-24.Publ El Cerrito. Earthquake Engineering Research Institute Data collected in multidisciplinary examinations of the Summerville-Charleston region, South Carolina. USA, ha,,c been analysed, and possible source zones delineated and a seismotectonic model of the region developed. In the model, episodic seismicity is occurring on two buried intersecting faults in response to the prevalent tectonic stress. Data sources included historic and present seismicity, seismic reflection and refraction surveys, and gravity, aeromagnetic, geological and geodetic examinations. 875018 Strike slip on reactivated Triassic (?) basin boundary fault zones as sources of earthquakes near Charleston, S. C. Behrendt, J C; Yuan. A Proe Third US National Conference on Earthquake
Engineering, Charleston, 24-28 August 1986 171, P43-54.Publ El Cerrito. Earthquake Engbwering Research Institute Several thousand kilometers of multifold seismic reflection data of the Charleston, South Carolina, USA, area have been analysed. Results of the analysis support a long held theory' that the seismicity of this area is associated with strike slip displacements on reactivated Triassic (?) basin boundary' fault zones. A high sensitivity aeromagnetic survey provides further evidence to support this hypothesis. 875019 Overview and summary of results for the project: seismic hazard characterization for the eastern United States Savy, J B: Bernreuter, D L: Mensing, R W Proe Th&d US National Conference on Earthquake
Engineering, Charleston, 24-28 August 1986 V1, P93-103.Puhl El Cerrito Earthquake Engineering Research hlstitute Seismic hazard depends on local seismicity and attenuation of ground motion between earthquake source and site. Limited seismic hazard data exist for the eastern United States. A method developed at the Laurence Livermore National Laboratory to assess seismic hazards is presented. It is based,
as are some other models, on: (1) identi!",ing sou:-ce ,'ones: {2) describing the seismicit.~ of source zones: {3) identif.ving an appropriate ground motion model: and ¢41 estimating the hazard by a probabilistic model. The method distinguishes between uncertainties in natural e~ents and uncertainties due to lack of site data or opinions used to formulate the model. The uncertaint.,, is presented in terms o( percentile curves for peak ground acceleration and for 5°0 d,m:ping spectral ,,alt,cs. Comparisons are made with alternative hazard prediction methods. 875020 Source scaling relations of large eastern North American earthquakes and implications for ground motions Somerville, P
Proc Third US National Conference on Earthquake Engineering, Charleston, 24-28 August 1986 l"l. P177124.Publ El Cerrito. F.arthquake En,~,im.~','mg Reg'a,ch Institute Ground motion simulations require a source model to specify' the level of high frequenc? radiation in relation to the seismic moment of the source. Some characteristics for earthquakes in eastern North America are compared ~ith those for other regions and found to be consistent ~vitb, constant stress drop scaling, but inconsistent with non-coqstant scaling models. Further evidence is provided to suggest that aspects of strong ground motion amplitudes may' not be significantly' different for eastern and western North America. Differences ma.v, though, arise because of difl'crences in crustal structure, scattering, anelasticity, and local site efl'ec',s. 875021 Nonstationary stochastic models for earthquakes Safak. E; Boore, D NI
Proc Third L'S National Conference on Earthquake Engineering, Charleston, 24-28 August 1986 11. P137148.Publ El Ccrrito. Earthquake Engweering Research Institute A stochastic seismological model for ground motion, based on the physical properties of the source ar'.d the medium, is introduced, and its advantages over present empirical models demonstrated. It is shown that the commonly used uniformlymodulated filtered white noise stochastic proce_,s for ground motion simulation introduces errors ~hich result in overestimation of structural response for systems v, hose fundamental period is greater than source duratior', of the earthquake. The filtered shot-noise process is then proposed to remo',e these errors. Finally', numerical examples are presented. 875022 Time-dependent seismic hazard estimates from the New Madrid fault zone Kiremidjian. A S: Suzuki, S Proc Third US National Conference on Earthquake
Engineering. Charleston, 24-28 August 1986 1"1. PI49160.Publ El Cerrito: 1-arthquake Engim,erin,.¢ Research Institute Seismic hazard due to earthquake acti',lt,, on the New Madrid fault zone for the cities of Memphis and St. Louis, USA, has been estimated using a time depcnden, stochastic model. This "model assumes that the time to the next event is defined by the size of the last event, but the size of the next event is random. Parameters of the model are based on limtted data, and the effect of uncertainty' of these parameters is studied. Results are compared with hazard estimates based on independence assumptions of earthquake events, and the difference between the predictions is discussed.
i, 1987 Pergamon Journals Ltd. Reproduction not permitted