DETERMINATION OF 1-D SHEAR WAVE VELOCITIES USING THE REFRACTION MICROTREMOR METHOD

摘要: Current commonly used techniques of estimating shallow shear velocities for assessment earthquake site response are too costly use in most urban areas. They require large sources to be effective noisy settings, or specialized independent recorders laid out an extensive array. The refraction microtremor (ReMi) method (Louie, 2001) overcomes these problems by using standard Pwave recording equipment and ambient noise produce average one-dimensional shear-wave profiles down 100m depths. combination available equipment, simple with no source, a wavefield transformation data processing technique, interactive Rayleigh-wave dispersion modeling tool exploits the aspects microtremor, spectral analysis surface wave (SASW), multichannel (MASW) techniques. slownessfrequency is particularly allowing accurate picking phase-velocity curves despite presence waves propagating across linear array at high apparent velocities, higher-mode Rayleigh waves, body air incoherent noise. It has been very quickly cheaply determining 30-m wave-velocity (V30) thus NEHRP (National Earthquake Hazard Reduction Program) soil classification. In addition, it also liquefaction analysis, profile determination, mapping subsurface strength materials, finding buried cultural features, such as dumps piers. this paper we briefly discuss method, acquisition interpretation yield velocities.