Heh... USGS is now saying that the quake up in the Mojave was a "computer glitch"..
AP finally chimes in:
SAN DIEGO (AP) A 5.1-magnitude earthquake centered in Baja California shook downtown San Diego on Tuesday afternoon, but there were no immediate reports of damage or injury.
The temblor struck abut 3:28 p.m. and was centered about 60 miles west of Tijuana, Mexico, said Deborah Hedges, a spokeswoman for seismologists at the California Institute of Technology in Pasadena.
So the citizens feeling the shaking are sharing that glitch