FMNEAR: Determination of Focal Mechanism and First Estimate of Rupture Directivity Using Near-Source Records and a Linear Distribution of Point Sources

The FMNEAR method is based on both the waveform inversion of near‐source seismic records and on a linear finite‐source model. The primary source parameters that are determined are the moment magnitude ( M null w ), the double‐couple focal mechanism (strike, dip, and rake), and the distribution of seismic moment along strike, which provides a first‐order estimate of rupture length and directivity. Source depth is also explored. An advantage of...