Sequence of Earthquakes near Berkeley, CA
|Information from the CISN Northern California Management Center
USGS & UC Berkeley
|Date & Time (Local):
||2 mi ESE of Berkeley, CA
CISN Earthquake Reports
Beginning in late December, 2006, a sequence of earthquakes occurred near Berkeley.
On December 20, at 07:12 PM (PST) a mild earthquake occured 2 miles ESE of Berkeley, CA.
The moment magnitude of this earthquake was 3.6. It was followed by another Mw 3.6 quake
on December 22 at 10:49 PM (PST) and a Mw 3.4 quake on December 23 at 09:21 AM (PST).
The last earthquake with magnitude greater than 3 in this sequence occurred on February 23
with a moment magnitude of 3.3. This sequence of earthquakes was located along the Hayward
Fault zone approximately 1 mile SE of the Berkeley campus. This is a relatively active
pocket of seismicity near Berkeley's border with Piedmont.
The map below shows earthquakes along and near the Hayward Fault from 2000 to July 2007. Black
dots indicate background seismicity. Other recent clusters along and near the Hayward Fault
are marked in color, with the earthquakes from December 2006 in yellow.
Bob Uhrhammer & Peggy Hellweg
- Ground Motions
The CISN Northern California Management Center produces
for events of M3.5 and higher. ShakeMaps are based on the observed ground motions
from seismic instruments combined with predicted motions in areas without sensors.
The CISN Engineering Data Center produces reports showing details of
ground motions for events of interest. They have issued an
Data Report for the 12/20 quake showing records from various sites of interest:
These earthquake were widely felt in the East Bay. People with Internet access
can report their observations of shaking and damage through the
Did You Feel It?
Web site. Unlike the ShakeMaps - which
are based on data from seismic instruments - these maps are
based on human observations. You can contribute to these data by
filling out the form for the event.
- Current Activity
These links will take you to seismograms showing current earthquake activity.
- Related Links
- The Hayward Fault
Information on the Hayward fault, including maps, tours, seismicity, and current
- Earthquake Probabilities for the San Francisco Bay Area
Results from the USGS-led working group indicate that the San Francisco Bay
Area has a 62% probability of experiencing an M6.7 or higher earthquake
from 2003 to 2032.
- Earthquake Scenario ShakeMaps
The USGS has computed ShakeMaps for several scenario earthquakes on the
These maps illustrate the ground motions predicted for such events.