California Earthquke FYI.

[ls99]

4.7 Quake Reported in Anza

It happened along the San Jacinto fault between the San Andreas and the Elsinore faults

Source: 4.7 Quake Reported in Anza | NBC 7 San Diego


Edit add: there were 4 additional earthquakes in the 2.5 to 2.7 range since around noon EST.
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[Original Wally]

Are we sure it wasn't a meteor(ite) that tripped the instruments?

 

[ls99]

I am not sure of anything since I passed age 55.

Do check the USGS web site for reality.

edit add from USGS

MLocation
Click event below for detailsTime
UTCLatLonD
km2.519km ESE of Anza, California2013-03-11 20:15:3633.508°N116.476°W9.42.518km ESE of Anza, California2013-03-11 20:15:3233.519°N116.478°W10.22.820km ESE of Anza, California2013-03-11 19:50:0733.502°N116.467°W9.32.821km ESE of Anza, California2013-03-11 18:25:4633.490°N116.454°W9.3