Two Small Tremors Gently Shake Altadena This Morning

Did You Feel the Earth Move -- Just a Little Bit?

According to the US Geological Survey website, two small earthquakes -- magnitude 2.2 and 2.1 -- occurred within two miles of west Altadena at 11:48 a.m. 

Consider it a subtle nudge to review one's emergency preparedness plan and supplies.

Liz H. July 07, 2012 at 12:15 AM
Tremor is correct, as is temblor.
Tim Blewett July 07, 2012 at 01:43 PM
Temblor is the earthquake event. A tremor is the shaking. The tremor is due to the temblor.
Tim Blewett July 07, 2012 at 01:53 PM
The faults are not directly related. There are literally dozens of faults in the area. Some are vertical faults resulting in horsts and grabens. The fault located directly behind Washington Jr. High (the name may be different now) is a vertical fault. I believe the Raymond Fault is also vertical. The San Andreas located on the north side of the San Gabriels is a lateral thrust fault. The west side has moved north about 30 miles in the last 30,000,000 years. This can be seen where the rocks in the Devil's Punch Bowl Formation are split. One portion is in the Devils Punch Bowl, and the other portion is in Cajon Pass.
lonnie fehr July 07, 2012 at 05:33 PM
so ,,whos ,,, fault was this ,,, lol
Tim Blewett July 07, 2012 at 06:54 PM
Draw a line from Pacoima Creek, Big Tajunga, Mill Creek, Upper Arroyo, West Fork of the San Gabriel River and East Fork of the San Gabriel. When I took Geology at PCC in 1960/62 I believe the thoughts were that the fault was inactive; however, faults and volcanoes have a habit of becoming active when you least want them to.


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