This found on Isaiah List:
Event # date UTC Depth Mag
9107934 CI 99/10/10 10:33:59 31.48N 116.43W 6.0 3.9ML D 82 mi. SSE of San Ysidro, CA

Its a bit far south and just under my 4.0, but in the right time frame... Its not showing on the map.

I am no longer expecting anything over 4.0 in southern cal.

Canie