I subscribe to the USGS sites alerts.  I've been getting 15 to 20 emails a day for tremors of 3.0 and greater.  If they were closer to the coast I'd be concerned if I still lived in So. Cal.  Here is an example of the email I've been getting.

                     == PRELIMINARY EARTHQUAKE REPORT ==



Region:                            BAJA CALIFORNIA, MEXICO
Geographic coordinates:            31.866N, 115.067W
Magnitude:                        4.8 Ml
Depth:                            6 km
Universal Time (UTC):             15 Apr 2010  10:20:21
Time near the Epicenter:          15 Apr 2010  03:20:21
Local standard time in your area: 15 Apr 2010  10:20:21

Location with respect to nearby cities:
  47 km (29 miles) S (175 degrees) of Guadalupe Victoria, Baja California, Mexico
  72 km (45 miles) SSW (202 degrees) of San Luis Río Colorado, Sonora, Mexico
  76 km (47 miles) SSW (202 degrees) of San Luis, AZ
 198 km (123 miles) ESE (111 degrees) of Tijuana, Baja California, Mexico



-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf Of joseph dolliver
Sent: Thursday, April 15, 2010 2:08 PM
To: [log in to unmask]
Subject: [HP3000-L] OT: do you think southern cal/ Mexcio are ready to break apart


follow the link

http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/10/245_30.php

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