Journal of Structural Geology | 2019
Inverse modeling for possible rather than unique solutions
Abstract
Abstract Despite the implementation of several kinematic and mechanical models for fault-related folding, and the incorporation of structural uncertainty in geological models, structural modeling is still too deterministic. The current focus is on forward modeling of a unique fit. We show the application of trishear inverse modeling, global optimization and Markov chain Monte Carlo (MCMC) methods, to a clay model of basement-involved compressional faulting, from which we know both total and incremental deformation. Global optimization and MCMC methods provide a range of possible models rather than a unique fit. Total inversions give an average of the model s deformation, while incremental inversions are more physically related to the model s evolution. Global optimization identifies the full range of possible models, while MCMC characterizes expected parameter values and their uncertainties. Structural inversions without sound geology are meaningless. A robust stratigraphy, geomorphic markers, mesoscopic structures, analogue and mechanical modeling can all greatly improve the inversions.