An Investigation on the Estimation of Surface Wave Characteristics Based on the Spatial Differentiation of Translational Component and Direct Observation of Rotational Velocity

Abstract

By utilizing the six-component information, which includes translational components and rotational components in microtremor observation, various benefits such as the direct calculation of not only Rayleigh wave velocity but also Love wave velocity can be achieved. In this study, two types of microtremor array observations were conducted. Firstly, to assess the performance of the portable rotational velocity sensor, we compared the observed data with those obtained through spatial differentiation of translational data. Subsequently, a method for determining the phase velocity of surface waves using the ratio of translational acceleration to rotational velocity was applied. The validity, prerequisites, and utility of this method were examined through comparisons with conventional SPAC methods and extended SPAC methods.