Appears that the Brawley/El Centro area has awoken with a vengence giving hits to options #1 and #2 with 2 of the events being M4's as follows:

MAG DATE LOCAL-TIME LAT LON DEPTH LOCATION
y/m/d h:m:s deg deg km
4.3 2000/06/14 14:49:18 32.878N 115.499W 12.7 10 km ( 6 mi) SSE of Brawley, CA
4.2 2000/06/14 12:00:20 32.896N 115.502W 5.1 9 km ( 6 mi) SSE of Brawley, CA

These events haven't been reviewed by a seismologist, so I may be premature on my call.

Dennis