M4.2 near Lafayette, CA
|Information from the CISN Northern California Management Center
USGS & UC Berkeley
|Date & Time (Local):
|Date & Time (UTC):
||1 mile NE of Lafayette, CA
CISN Earthquake Reports
On March 1, 2007 At 08:40 PM (PST) a 'light' earthquake occured 1 mile NE of Lafayette, CA. The local magnitude of this earthquake was 4.2
The map below shows earthquakes along and near the Hayward Fault from 2000 to the present.
The July 20, 2007 event
is indicated in green, and 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. The Lafayette event which occurred
on the evening of March 1, 2007 and its aftershocks are denoted in dark blue.
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 M4.2 showing records from the Walnut Creek hospital
(3.6 km away) as well as other sites of interest:
This earthquake was 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
- Bay Area and California Earthquake Probabilities (PDF)
Results from the USGS-led working group indicate that the San Francisco Bay
Area has a 63% 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.