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A magnitude 6.0 Mw (USGS/UC Berkeley) earthquake occurred
on 28 Sep 2004 at
10:15 PDT in the Parkfield area. The hypocenter was 11 km SSE of
Parkfield, at a depth of 8 km. Early analysis by USGS and UC Berkeley indicates
the event had a strike slip mechanism and most likely occurred on the San
Andreas fault. Further information is available at
www.cisn.org/special/evt.04.09.28/, which states that this event is the
anticipated Parkfield earthquake, rupturing roughly the same segment as the 1966
event.
There are many strong motion stations in the area because of the
Parkfield array of CSMIP as well as stations of the USGS.
However, there are relatively few modern digital stations with
communication capability. Many stations in the area are planned
for upgrade as resources allow however. As a result of the lack
of data, the early information may be significantly modified as
more data is recovered in the field. The
CISN Internet
Data Report (IDR) lists peak
accelerations and distances for the stations recovered by the CGS/CSMIP
and the USGS/NSMP programs of CISN.
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