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A METHOD FOR DYNAMIC CHARACTERISTICS ESTIMATION OF SUBSURFACE USING MICROTREMOR ON THE GROUND SURFACE
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1989
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Geotechnical EngineeringHorizontal ComponentsGround MotionEngineeringSurface Deformation MonitoringEnvironmental MonitoringAerospace EngineeringSubsidence MonitoringCivil EngineeringAccurate EstimationStructural Health MonitoringRemote SensingSurface ModelingBoring InvestigationInclinometerInstrumentationEarth ScienceSubsurface System
Dynamic characteristics estimation of surface layers is traditionally performed by boring, which is accurate but costly and time‑consuming, while microtremor methods are convenient but have not yet yielded satisfactory results. The study proposes a new microtremor‑based processing method to accurately estimate ground motion characteristics. The method utilizes both vertical and horizontal microtremor components. The spectrum ratio of horizontal to vertical microtremor components resembles the transfer function for horizontal surface layer motion, indicating accurate estimation.
As methods for dynamic characteristics estimation of surface layers, investigation with boring and a method which employs microtremor are well known so far. Boring investigation, one of the most accurate methods is costly and time consuming and is not available all the time. The method that employs microtremor is handy but has not produced satisfactory result to this day. This paper describes a new processing method that employs microtremor observation yet producing accurate estimation of characteristics of the ground motion. The method uses vertical component and horizontal components. As a result, the spectrum ratio of the horizontal components and vertical component of microtremor bears resemblance to transfer function for horizontal motion of surface layers.