2014 South Napa earthquake
The 2014 South Napa earthquake occurred in the North San Francisco Bay Area on August 24 at 03:20:44 Pacific Daylight Time. At 6.0 on the moment magnitude scale and with a maximum Mercalli intensity of VIII (Severe), the event was the largest in the San Francisco Bay Area since the 1989 Loma Prieta earthquake. The epicenter of the earthquake was located to the south of Napa and to the northwest of American Canyon on the West Napa Fault.
Damage to the Sam Kee Laundry Building | |
Napa | |
| UTC time | 2014-08-24 10:20:44 |
|---|---|
| ISC event | 610572079 |
| USGS-ANSS | ComCat |
| Local date | August 24, 2014 |
| Local time | 03:20:44 PDT (UTC-7) |
| Magnitude | 6.0 Mw |
| Depth | 7 mi (11 km) |
| Epicenter | 38.22°N 122.31°W |
| Fault | West Napa Fault |
| Type | Strike-slip |
| Areas affected | North Bay (San Francisco Bay Area) California, United States |
| Total damage | $362 million–$1 billion |
| Max. intensity | MMI VIII (Severe) |
| Peak acceleration | 0.61 g |
| Casualties | 1 killed about 200 injured |
Total damage in the southern Napa Valley and Vallejo areas was in the range of $362 million to $1 billion, with one person killed and 200 injured. Other aspects of the event included an experimental earthquake warning system that alerted seismologists several seconds before the damaging shear waves arrived, temporary changes in springs and wells, and the potential for postseismic fault creep.