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Estimating a continuous Moho surface for the California Unified Velocity Model

Carl H. Tape, Andreas Plesch, John H. Shaw, & Hersh Gilbert

Published 2012, SCEC Contribution #1534

The objective of this paper is to estimate a detailed Moho surface, from all available data, for onshore and offshore California; currently, no such map exists. Our motivation is to obtain a continuous, smooth surface that can be implemented within 3D structural models that are used for simulations of seismic-wave propagation, such as the California Community Velocity Model (CVM-H) of the Southern California Earthquake Center. We first document the available datasets for estimating the Moho surface in California and its adjacent regions; we refer to this surface as the California Moho Model version 1.0 (CMM-1.0). We then describe the least-squares estimation problem of using spherical wavelets to estimate a continuous surface from the discrete data points, and we also discuss the implementation of the surface within CVM-H. We also discuss relevant codes and plotting tools for utilizing the model, and the plans for future updates to the Moho surface model.

Tape, C. H., Plesch, A., Shaw, J. H., & Gilbert, H. (2012). Estimating a continuous Moho surface for the California Unified Velocity Model. Seismological Research Letters, 83(4), 728-735. doi: 10.1785/0220110118.