A strong earthquake of magnitude 6.0 (Mw) struck the Central Coast of California at 10:15:24 AM PST (17:15:24 UTC) on Tuesday, September 28, 2004. The epicenter (Figure 1) was 11 km (7 mile) SSE of Parkfield, at a depth of approximately 8 km (5 mile). The main shock was followed by a strong aftershock of magnitude 5.0 roughly four minutes later. As expected, numerous smaller aftershocks continue to strike to epicentral region. At the time of this report, no injuries have been reported and the damage is light, mostly limited to nonstructural damage. This preliminary report presents basic information on the epicenter location, intensity of shaking, and performance of structures in the epicentral region.


Civil and Environmental Engineering

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URL: https://digitalcommons.calpoly.edu/cenv_fac/78