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Seismic response by variable damping finite elements
117~
Vibration
i5~,90m SOIL SURVEY, TECH.MONOGRAPH N3,1973,227P.
i143 BRUN~,T Y.sEJ RENSSELAER POLYTECH. TROY, NY. USA Surface-wave propagation under initial tension or compression. 3F, SR. 3EISMOL. SOC. AMER. BULL.V63, ~6, DEC. 1973, P1895-1899. Fne propagation of Rayleigh waves in a half-space and the propagation of Love waves in a welded layer and half-space are examined when initial tensile c~ concessive stresses are present. Using the perturbed and lir~arized equations of elasticity~ ~odified R a y l e ~ h anl Love equations are obtained. The solution of the equations shows a dramatic change in the phase speeds of the two wave types under initial tension or compression. Numerical ~esults are presented. Auth.
i14~ JOBERT, G UNIV. PARIS VI, F ~ravel-tlme equations and energy propagation for an elastic~ heterogeneous, isotroplc medium: correlation and approximate inversion. 1R. SEISMOL. SOC. AMER. BULL.V63, N6, DEC. 1973, P1~7-1972. ~xpressions identical to the fcrmttlas of a preceding paper, (G. Jobert, Seigmol. Soc. Am~r. Bull. V62, Pll07-1112~ 1972), are obtained when due allowance is m~de for the variation of quantities which were erroneously taken as constant. A method for the ~pprnx!mate inversion of the travel-tlme curves is presented for the case where the surfaces of equal weloclty are ~lanes with an infinitesimal dip. Auth. ~145 IfANAS6WICH~ ER UNTV. ALBERTA, EDMONIDN, CDN AJ2AfLA~, T UNIV. ALBERTA~ EDMONTON, CDN ~RON, F UNIV. ALBERTA, .hT)MC~TON~CDN l~qe importance of S-wave precursors in shear-wave studies. 3EIS4OL. SOC. ;~4~. BUI~. V63, N3,1973, P2116- 2166.
m46 IDRISS, I~4 SEED, ~ ~eimnlc response by variable damplr~ finite elements. 9F, 22R. J. GEOTECH •ENGNG. DIV. VI00, GTI, JAN. 1974, PI-13 • An analytical procedure for the evaluation of the selsmic response of soil deposits is presented. This procedure permits the use of straln-dependent modulus and damping values for each element in a ~inlte element representation of the deposit. Its ase in demonstrated for a 10Oft layer of sand and hhe results are compared with those from a onelime~sional wave propagation solution. i147 ~0RIZEK,RJ NORTHWESTERN UNIV.EVANSTON, ILL, USA ~CLEAN, FG ARMY WATERWAYS EXPT. STAT .VICKSBURG, USA O!GF~, ~ NORTHWESTERN UNIV. EVANSTON, ILL. USA ~ffect of particle characteristics on wave velocity. Technical note. IF, IT,7R. J. GEOTECH. E~3NG.DIV.VI00~ GTI, JAN. 1974, P89-94. An experimental programme directed towards establishing quantitative evaluation of the effects of particle size, shape and distribution on the compression wave velocity in a variety of different sands is described.
Classification and identification ii48 ~AGG,~ MACKAULAY INST. SOIL RES.ABERDEEN, GB CLAYDEN, B ROTHAMSTED EXP. STAT .HARPENDEN, GB The el.~sslfication of some British soils according to ~he co,~In~ehensive system of the United States. Textbook.
Geology Mechanism of faulting and folding See also a~stract: Iii0.
Tectonic processes 1149 BRUN~/~,EJ RENSSELAER IK]LYTECH.TROY, NY. USA Surface instability due to initial compressive stress. 6F, 5E. SEISMOL. S0C .AMER.BULL. V63, N6,DEC. 1973, P1885-1893. Utilizing a linearized theory of isbtropicl homogeneOus elasticity that includes the effects of initial stress, it is demonstrated that Raylelgh a1~ Love surface instabilities occur when the compresr,lve stress reaches appropriate critical values. It is suggested that these two instabilities may of far possible, although hi~aly idealizedj mechanisms fa:~ earthquake initiation and prehistoric land-mass formations such as mountain chains. Auth.
Environmental effects,weathering and soi'J formation See also abstract : 1121.
1150 DE PLOEY, J soil mechanic~1 approach of the erodibility of loess by solifluction. 30R. REV. GEOMORPH. DYNAMIQUE, V22, N2,19733 P61-70. i151 HIAGKOV, ~4 Method of detern~nlng the state of physical weath~irinz 4R. SOVIET A~fARCTIC EXPED. INFORM.BULL. Qll5. ~862,VSj
~7,SE~T.1973,r385-387. During field studies in 1970 and 1971 some reliei characteristics of the southern part of Victorls Land showed ir~lications of a sharp ch~u~ze (in time space) in the rate of rock weathering. The ;w st l~obable reason for this is a change in existing moisture conditions. This assumption h;~s been verified by l~boratory experiments.
Earthquake mechanisms and effects ;ee also abstr~ct : 1145. i152 FLINN, EA ~YNE GEOTECH.VIRGINIA, USA COHEN, TJ ~ ~OYNE GEOTECH.VIRGINIA, USA MCCOWAN, DW PENNSYLVANIA STATE UNIV.USA Detection and analysis of multiple seismic events 13F, 3T, llR. SEISMOL. SOC. AMER. BULL.V63, N6, DEC. 1973, P1921-1936 • Several methods of analysing short-period seismic records, with the purpose of detecting multiple events, are compared. The methods evaluated include ~rlsual analysis of the array-beam sUms, n~ultichannel matched filtering, autocorrelation analysis, and cepstral analysis.
Vibration
i5~,90m SOIL SURVEY, TECH.MONOGRAPH N3,1973,227P.
i143 BRUN~,T Y.sEJ RENSSELAER POLYTECH. TROY, NY. USA Surface-wave propagation under initial tension or compression. 3F, SR. 3EISMOL. SOC. AMER. BULL.V63, ~6, DEC. 1973, P1895-1899. Fne propagation of Rayleigh waves in a half-space and the propagation of Love waves in a welded layer and half-space are examined when initial tensile c~ concessive stresses are present. Using the perturbed and lir~arized equations of elasticity~ ~odified R a y l e ~ h anl Love equations are obtained. The solution of the equations shows a dramatic change in the phase speeds of the two wave types under initial tension or compression. Numerical ~esults are presented. Auth.
i14~ JOBERT, G UNIV. PARIS VI, F ~ravel-tlme equations and energy propagation for an elastic~ heterogeneous, isotroplc medium: correlation and approximate inversion. 1R. SEISMOL. SOC. AMER. BULL.V63, N6, DEC. 1973, P1~7-1972. ~xpressions identical to the fcrmttlas of a preceding paper, (G. Jobert, Seigmol. Soc. Am~r. Bull. V62, Pll07-1112~ 1972), are obtained when due allowance is m~de for the variation of quantities which were erroneously taken as constant. A method for the ~pprnx!mate inversion of the travel-tlme curves is presented for the case where the surfaces of equal weloclty are ~lanes with an infinitesimal dip. Auth. ~145 IfANAS6WICH~ ER UNTV. ALBERTA, EDMONIDN, CDN AJ2AfLA~, T UNIV. ALBERTA~ EDMONTON, CDN ~RON, F UNIV. ALBERTA, .hT)MC~TON~CDN l~qe importance of S-wave precursors in shear-wave studies. 3EIS4OL. SOC. ;~4~. BUI~. V63, N3,1973, P2116- 2166.
m46 IDRISS, I~4 SEED, ~ ~eimnlc response by variable damplr~ finite elements. 9F, 22R. J. GEOTECH •ENGNG. DIV. VI00, GTI, JAN. 1974, PI-13 • An analytical procedure for the evaluation of the selsmic response of soil deposits is presented. This procedure permits the use of straln-dependent modulus and damping values for each element in a ~inlte element representation of the deposit. Its ase in demonstrated for a 10Oft layer of sand and hhe results are compared with those from a onelime~sional wave propagation solution. i147 ~0RIZEK,RJ NORTHWESTERN UNIV.EVANSTON, ILL, USA ~CLEAN, FG ARMY WATERWAYS EXPT. STAT .VICKSBURG, USA O!GF~, ~ NORTHWESTERN UNIV. EVANSTON, ILL. USA ~ffect of particle characteristics on wave velocity. Technical note. IF, IT,7R. J. GEOTECH. E~3NG.DIV.VI00~ GTI, JAN. 1974, P89-94. An experimental programme directed towards establishing quantitative evaluation of the effects of particle size, shape and distribution on the compression wave velocity in a variety of different sands is described.
Classification and identification ii48 ~AGG,~ MACKAULAY INST. SOIL RES.ABERDEEN, GB CLAYDEN, B ROTHAMSTED EXP. STAT .HARPENDEN, GB The el.~sslfication of some British soils according to ~he co,~In~ehensive system of the United States. Textbook.
Geology Mechanism of faulting and folding See also a~stract: Iii0.
Tectonic processes 1149 BRUN~/~,EJ RENSSELAER IK]LYTECH.TROY, NY. USA Surface instability due to initial compressive stress. 6F, 5E. SEISMOL. S0C .AMER.BULL. V63, N6,DEC. 1973, P1885-1893. Utilizing a linearized theory of isbtropicl homogeneOus elasticity that includes the effects of initial stress, it is demonstrated that Raylelgh a1~ Love surface instabilities occur when the compresr,lve stress reaches appropriate critical values. It is suggested that these two instabilities may of far possible, although hi~aly idealizedj mechanisms fa:~ earthquake initiation and prehistoric land-mass formations such as mountain chains. Auth.
Environmental effects,weathering and soi'J formation See also abstract : 1121.
1150 DE PLOEY, J soil mechanic~1 approach of the erodibility of loess by solifluction. 30R. REV. GEOMORPH. DYNAMIQUE, V22, N2,19733 P61-70. i151 HIAGKOV, ~4 Method of detern~nlng the state of physical weath~irinz 4R. SOVIET A~fARCTIC EXPED. INFORM.BULL. Qll5. ~862,VSj
~7,SE~T.1973,r385-387. During field studies in 1970 and 1971 some reliei characteristics of the southern part of Victorls Land showed ir~lications of a sharp ch~u~ze (in time space) in the rate of rock weathering. The ;w st l~obable reason for this is a change in existing moisture conditions. This assumption h;~s been verified by l~boratory experiments.
Earthquake mechanisms and effects ;ee also abstr~ct : 1145. i152 FLINN, EA ~YNE GEOTECH.VIRGINIA, USA COHEN, TJ ~ ~OYNE GEOTECH.VIRGINIA, USA MCCOWAN, DW PENNSYLVANIA STATE UNIV.USA Detection and analysis of multiple seismic events 13F, 3T, llR. SEISMOL. SOC. AMER. BULL.V63, N6, DEC. 1973, P1921-1936 • Several methods of analysing short-period seismic records, with the purpose of detecting multiple events, are compared. The methods evaluated include ~rlsual analysis of the array-beam sUms, n~ultichannel matched filtering, autocorrelation analysis, and cepstral analysis.