Abstract

Microzonation, the estimation of (shear) wave velocity profiles of the upper few 100 m in dense 2D profiles, is one of the key methods for understanding the variation in seismic damage caused by ground‐shaking events and thus for mitigating the risk of damage in the future. In this article, we present a novel method for estimating the Love‐wave phase velocity dispersion using ambient noise recordings. We use the vertical component of rotational motions inherently present in ambient noise and the established relation to simultaneous recordings of transverse acceleration, in which the phase velocity of a plane SH (or Love)‐type wave acts as a proportionality factor. We demonstrate that the developed inversion technique shows comparable results to more classical, array‐based methods. Furthermore, we demonstrate that if portable weak‐motion rotational motion sensors are available and the installation of a seismic network or array is not possible, a single point, multicomponent approach for estimating the dominant direction of the incident wavefield and the local velocity structure will be feasible with similar performance compared to more classical techniques.

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