Magnitude Mw6.4 in the region of the triple junction, at northern end of the San Andreas fault, . Mechanism is strike slip; rupture may have occurred on any of the ~N-S or ~E-W fault plane as it's a tectonically complicated area.

Mechanism Geoscope IPGP:

USGS got very similar mechanism, but puts hypocenter deeper (around 20km). This perhaps means that the rupture happened in the Gorda tectonic plate beneath the upper N American plate. The small Gorda plate is plunging under N America along the zone.

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