An aftershock was measured at magnitude-5.1 within hours of the bigger quake.
According to the United States Geological Survey, there were 22,289 earthquakes worldwide in 2011, of which about only 20 measured above a magnitude-7.0.
In 2011, there were 5,237 reported earthquakes in the United States. Only one was above a magnitude-7.0. This year, we are up to 694.
In Belmont and in California, things have been quiet over the last week, with only a few small shakers.
The strongest, a magnitude-2.8 centered in Tres Pinos, Calif. and the weakest, four magnitude-1.0 miniquakes centered in Berkeley, Orinda, Chualar and Tres Pinos, Calif.
Here's a list of the most recent 23 quakes and their locations.
Check out the video we produced during the
The city of Menlo Park has an emergency notification system which can be used by city staff to send personalized voice and data messages to residents and businesses within Menlo Park. The system has the capability of sending thousands of messages in minutes using a single announcement.
You can sign up to be a part of the system here.
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