There are many earthquake catalogs covering California, but none includes everything one would like to have for constructing and testing hypotheses of earthquake occurrence. Perhaps it is most obvious that focal mechanism estimates are needed in many phases of earthquake forecasting and evaluation. They are needed for estimating the stress increments from past earthquakes, for identifying those earthquakes that have been encouraged by known previous earthquakes, and for testing models that forecast focal mechanisms as well as location and magnitude. Focal mechanisms are available for recent, instrumentally recorded earthquakes, but they are not yet uniformly available for all relevant quakes,...

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