1868 Hayward earthquake
The 1868 Hayward earthquake occurred in the San Francisco Bay Area, California, United States on October 21. With an estimated moment magnitude of 6.3–6.7 and a maximum Mercalli intensity of IX (Violent), it was the most recent large earthquake to occur on the Hayward Fault Zone. It caused significant damage and a number of deaths throughout the region, and was known as the "Great San Francisco earthquake" prior to the 1906 San Francisco earthquake and fire.
Damage to the Alameda County courthouse with inset showing building before the earthquake | |
Santa Rosa Santa Cruz | |
| UTC time | 1868-10-21 15:53 |
|---|---|
| USGS-ANSS | ComCat |
| Local date | October 21, 1868 |
| Local time | 07:53 |
| Magnitude | 6.3–6.7 Mw |
| Epicenter | 37.7°N 122.1°W |
| Fault | Hayward Fault Zone |
| Type | Strike-slip |
| Areas affected | San Francisco Bay Area California United States |
| Total damage | $350,000 / Moderate |
| Max. intensity | MMI IX (Violent) |
| Casualties | 30 |
Damaged building in Hayward (top) and at the Hayward stud mill
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