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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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