ADMM-based full-waveform inversion for microseismic imaging

Full waveform inversion (FWI) is beginning to be used characterize weak seismic events at different scales, an example of which microseismic event (MSE) characterization. However, FWI with unknown sources a severely underdetermined optimization problem, and hence requires strong prior information about the and/or velocity model. The frequency-domain wavefield reconstruction method (WRI) has shown promising results mitigate nonlinearity objective function that generated by cycle-skipping. WRI relies on data-assimilated wavefields, approach true wavefields near receivers, helpful feature when source added as additional variable. We present adaptation recently proposed version based alternating direction multipliers (ADMM) first finds location MSEs then reconstructs signatures jointly. Finally, subsurface model updated focus their location. does not require knowledge number MSEs. stabilized sparsifying regularizations separately tailored subproblems. tested Marmousi using one MSE two clusters initial models, accurate rough one, well noise. In all cases, accurately locates recovers signatures.