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Magnitude 6.0 - CENTRAL CALIFORNIA
Preliminary Earthquake Report |
This earthquake is the anticipated Parkfield earthquake,
Mw 6.0 on the San Andreas fault.
It ruptured roughly the same segment of the fault that broke in 1966.
The earthquake occurred at 10:15 AM PDT on September 28, 2004.
Its hypocenter was located at 35 degrees, 49 minutes north, 120 degrees 22 minutes west, at a depth of 8 km or 5 miles.
From this point, about 7 miles SW of the town of Parkfield,
it ruptured primarily northwest along the San Andreas fault.
Strong shaking during this event lasted for about 10 seconds.
This earthquake is the seventh in a series of repeating earthquakes on this stretch of the fault.
The previous events were in 1857, 1881, 1901, 1922, 1934, and 1966.
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Location Maps: Topo map centered at earthquake Did you feel it? ShakeMap shaking intensity maps Berkeley moment tensor solution Historical Moment Tensor Solutions Theoretical P-Wave Travel Times Earthquake Information for CALIFORNIA The Parkfield Earthquake Experiment |
News Links
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For more information, go to http://quake.wr.usgs.gov/ || Contacts
The official magnitude for this earthquake is indicated at the top of this page. This was the best available estimate of the earthquake's size, at the time that this page was created. Other magnitudes associated with web pages linked from here are those determined at various times following the earthquake with different types of seismic data. Although, given the data used, they are legitimate estimates of magnitude, they are not considered the official magnitude.
The
USGS Earthquake Hazards Program (EHP) of the U.S. Geological Survey (USGS)
is part of the National Earthquake Hazards Reduction Program (NEHRP)
led by the Federal
Emergency Management Agency (FEMA).
U.S.
Geological Survey, a bureau of the U.S. Department
of the Interior |