 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[1] |
| Magnitude | 6.3–6.7 Mw[2] |
| Epicenter | 37°42′N 122°06′W / 37.7°N 122.1°W[3] |
| Fault | Hayward Fault Zone |
| Type | Strike-slip |
| Areas affected | San Francisco Bay Area California United States |
| Total damage | $350,000 / Moderate [4] |
| Max. intensity | MMI IX (Violent) [3] |
| Casualties | 30[3] |
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.
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