Identification of Seismic Ground Motions in a Near-Surface 2D Domain Subject to Unknown SH Incident Waves
Publication: Geo-Congress 2022
ABSTRACT
A new inversion approach for estimating the shear wave motions in an interior domain surrounded by the domain reduction method (DRM) layer from sparsely measured seismic motion data is presented in this paper. We consider a 2D domain truncated by wave-absorbing boundary conditions (WABC), and the DRM is utilized to inject incident waves into the domain. We attempt to identify an effective seismic force at the DRM layer and reconstruct the ground motions in an interior domain. A gradient-based minimization method minimizes a misfit between measured motions induced by targeted effective forces and their estimated counterparts. The numerical results show that targeted ground motions in an interior domain can be reconstructed. To accurately reconstruct the wave responses, a minimum sensor spacing is required, and it clearly depends on the dominant frequency of incident waves.
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Geo-Congress 2022
Pages: 599 - 607
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Published online: Mar 17, 2022
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