Earthquakes

In a stretch of land 40 or 50 miles long north-south and maybe 10 miles wide, about 100 miles east of San Diego, there have been, in the last 13 hours and 30 minutes,

• 38 earthquakes 3.5 to 3.9
• 28 between 4.0 and 4.0
• a 5.0 and 5.3
• 7.2

The shaking from the 7.2 went on maybe 30 seconds, but nothing fell off the shelves where I am. One hopes this is releasing enough energy to put off the big one a while rather than putting more strain on the San Andreas to make it happen sooner.

Two good sites about earthquakes:

• http://www.cisn.org/ California Integrated Seismic Network. Pick northern or southern California for a list of all recent quakes 3.5 or bigger and links to a map of the earthquake area.
• http://earthquake.usgs.gov/earthquakes/step/ This is a map of California color-coded to the probability of an areas's experiencing a 6.0 or larger in the next 24 hours. Right now it looks like a sunrise over Calexico.