Today's M6.3 Earthquake Offshore San Diego

john's picture

The earthquake occurred about 263 km SW of Avalon, California (red star) with few aftershocks.  It was a normal faulting (tensional) event, not the usual strike slip event we expect in California earthquakes.  It also occurred in what we consider to be a region at low probability for a M>6.5 event as shown by the image below.  While one can never say for certain that a given event is/is not a foreshock of a larger event, the fact that it occurred in a such a low probability region would argue against viewing this event as a direct precursor to a larger event.  

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