Planar Seismic Wavefront Modeling for Estimating Rotational Ground Motions: Case of 2D P-SV Line Source
Publication: Journal of Engineering Mechanics
Volume 144, Issue 7
Abstract
At large hypocentral distances, it is convenient to approximate curved transient seismic wavefronts as planar to estimate rotational ground motions from the single-station recordings of translational ground motions. This paper investigates whether and when this approximation, referred to as the plane-wave approximation, can be considered to be adequate close to the source. A simplistic source model comprising a two-dimensional (2D) kinematic shear dislocation P-SV line source buried in a homogenous, elastic half-space is considered to model the finite fault. The plane-wave rotational motion is then synthesized from the exact translational motion corresponding to the assumed model and compared with the exact rotational motion. The comparison of the two sets of rotational amplitudes in the frequency domain suggests that the plane-wave approximation may lead to significant underestimation of the Fourier amplitudes when the incidence angles of the seismic waves are small or when the wavelengths are appreciably longer than the hypocentral distance. For short wavelengths and other incidence angles, the adequacy of the plane-wave approximation depends critically on the source dip angle.
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Published In
Journal of Engineering Mechanics
Volume 144 • Issue 7 • July 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Feb 9, 2017
Accepted: Nov 20, 2017
Published online: Apr 27, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 27, 2018
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