= Peter M. Shearer
{c}
<Peter M. Shearer> coauthored a method for inferring <focal mechanisms> from <P wave> first-motion polarities. It varies source location and the <velocity model>, collecting acceptable mechanisms rather than treating every ray direction as exact.<A New Method for Determining First-Motion Focal Mechanisms by Jeanne L. Hardebeck and Peter M. Shearer>[Abstract: location, velocity-model and polarity uncertainty]{ref}
The spread of acceptable solutions measures stability of the inference and helps distinguish real fault-orientation variation from measurement uncertainty.
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