Wavefield imaging o?ers a robust approach for source evaluation in microseismic monitoring. The coexistence of P- and S- wavemodes at the source location after time-reversal leads to an imaging condition from which the source position and radiation pattern can be identified. We propose a new imaging condition that is based on energy conservation and is directly related to the source mechanism. Unlike the correlation between decomposed P- and S- wavefields typically used in passive elastic imaging, our imaging condition compares wavemodes present in the displacement field without costly wave-mode decomposition, and produces a strong and focused correlation at the source location. Numerical experiments demonstrate the advantages of the proposed imaging condition (compared to PS correlation), its sensitivity with respect to velocity inaccuracy and sparse acquisition, and its quality and efficacy in estimating the source location.
Presentation Date: Tuesday, October 18, 2016
Start Time: 1:25:00 PM
Presentation Type: ORAL