May 11, 1870 Tsunami: Puerto Angel, Mexico
A tsunami caused by a magnitude 7.9 earthquake began at Puerto Angel, Mexico on May 11, 1870 at 23:30 UTC. Its effects were recorded at 1 place. It killed 24 people, counting the earthquake or eruption that caused it.
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
Travel times
How long the first wave took to reach each part of the ocean, one line for each hour up to 24, estimated from the source and the depth of the sea.
The travel times are computed in your browser, which needs JavaScript.
- 1 to 4 hours
- 5 to 6 hours
- 7 to 14 hours
- 15 hours and more
Computed in your browser the way NOAA’s own travel time maps are: the wave travels at the square root of gravity times the depth, over NOAA’s ETOPO1 depths averaged to a 10 arc-minute grid. Checked against NOAA NCEI’s maps for 21 tsunamis over the first 24 hours, these lines fall within 10 minutes of NCEI’s at half the points compared and within 52 minutes at 9 in 10. They give when the first wave could arrive, not how high it is; bays, harbors and island chains finer than the grid can see it later. Not for use in a warning: see tsunami.gov.
The tsunami
- Date
- May 11, 1870, 23:30 UTC
- Source
- Puerto Angel, Mexico
- Cause
- Earthquake
- Earthquake
- Magnitude 7.9
- Runups recorded
- 1
- Waters
- Ocean
- How certain
- Probable tsunami
- Source location
- 15.400° N, 96.300° W
The toll
- Deaths
- 24 with the earthquake or eruption that caused it
- Injuries
- 20 with the earthquake or eruption that caused it
- Damage
- Severe (about $5 to $25 million) with the earthquake or eruption that caused it
- Houses destroyed
- Many (101 to 1,000) with the earthquake or eruption that caused it
Where the literature gives no number, NCEI records a description on a scale of 1 to 4, printed here in its words. Damage is in millions of US dollars of the year of the event, not adjusted for inflation.
What the record says
NCEI’s account, from the sources it cites.
May 11,1870, 15.8 N, 96.7 W, tsunami event validity 3. An earthquake of magnitude Ms=7.9 occurred at 23:30 local time in Oaxaca. The earthquake was oscillatory from South to North and was accompanied with a strong underground noise... At Puerto Angel it was reported that "the sea water and the sand of the beach were boiling". (reference #369)
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 |
|---|---|---|---|---|---|---|---|
| Puerto Angel | Mexico | 35 | Eyewitness observation of water height | day 12, 04:30 |
More
Every tsunami in 1870The 1800sTsunamis of MexicoThe earthquakeThis 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 2330.