Seismic Input Motion Identification in a Heterogeneous Halfspace
- Creators
- Jeong, C.
- Seylabi, E. Esmaeilzadeh
Abstract
This paper presents a new time domain method for reconstructing unknown incident seismic input waves entering into a truncated heterogeneous soil domain from a soil surface response. The problem is cast into a partial differential equation (PDE)–constrained optimization problem where a misfit between a measured response at a sensor on the ground surface induced by a target signal and a computed wave solution induced by an estimate signal is minimized. Using this method allows for fast and accurate evaluation of the sensitivity of a misfit functional (i.e., gradient or Fréchet derivative) with respect to control parameters. Both forward and adjoint problems are solved by using the finite-element method (FEM). The numerical results prove that the presented method can identify a targeted incident seismic input signal into a truncated soil domain without providing the numerical optimizer with any hint about the target. In presence of noise in measurement, this inversion process recovers a target signal more accurately than the deconvolution does.
Additional Information
© 2018 American Society of Civil Engineers. Received: December 04, 2016; Accepted: February 21, 2018; Published online: June 11, 2018.Additional details
- Eprint ID
- 87765
- Resolver ID
- CaltechAUTHORS:20180711-141437179
- Created
-
2018-07-11Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field