October 4, 1865 Tsunami: San Francisco, CA, United States
A tsunami of unknown cause began at San Francisco, CA, United States on October 4, 1865. Its effects were recorded at 1 place.
Where the waves reached
The source (white) and every runup with a place, colored by the water height recorded there. A ring is a runup NCEI marks doubtful.
- Under 1 m
- 1 to 3 m
- 3 to 10 m
- 10 to 30 m
- 30 m and more
- Height not recorded
The tsunami
- Date
- October 4, 1865
- Source
- San Francisco, CA, United States
- Cause
- Unknown
- Runups recorded
- 1
- Waters
- Ocean
- How certain
- Erroneous entry
- Source location
- 37.000° N, 122.000° W
The toll
The record gives no deaths, injuries or damage for this tsunami.
What the record says
NCEI’s account, from the sources it cites.
Alternate date for October 8, 1865 event.
Every runup
Nearest the source first. Heights are above sea level at the time; a tide gauge reads half the wave’s full height.
| Where | Country | Km from source | Water height, m | Inland, m | Measured by | First wave, UTC | Deaths |
|---|---|---|---|---|---|---|---|
| Santa Cruz, CA, CA doubtful | United States | 4 | Eyewitness observation of water height |
More
Every tsunami in 1865The 1800sTsunamis of United StatesThis day in weather historyAlerts in force
Sources
Tsunami events and runups from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. NCEI tsunami event 939.