Reviewed by USGSChile101y ago
M5.7 earthquake 106 km WSW of San Antonio, Chile
Monday, October 25, 1926, 15:38:55 UTC · 33.804°S, 72.729°W
A magnitude 5.7 earthquake struck 106 km WSW of San Antonio, Chile on Monday, October 25, 1926, 15:38:55 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M5.8 on September 6, 1926.
- Magnitude
- 5.7
- Moderate · mw
- Depth
- 15 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- —
- No ShakeMap
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquake
In context
How big was it, and why here?
Energy released
6 kilotons of TNT
That is about 1/2 of the Hiroshima bomb. It released about 13 times the energy of a magnitude 5.0.
Tectonic setting
19 km
from the nearest mapped plate boundary, between the Nazca and South American plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
15 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 75 km
USGS has not published any M2.5+ earthquake within 75 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 9 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.2The 1906 Valparaiso, Chile EarthquakeAugust 17, 1906 · 199 km NE of this epicenter
- 7.7103 km NW of Constitución, ChileJanuary 30, 1914 · 119 km SW of this epicenter
- 6.7210 km WNW of Valparaíso, ChileDecember 11, 1904 · 189 km NW of this epicenter
- 6.599 km SE of Rengo, ChileJanuary 30, 1914 · 282 km SE of this epicenter
- 6.358 km WNW of La Ligua, ChileOctober 2, 1906 · 202 km NE of this epicenter
- 6.3210 km WNW of Constitución, ChileSeptember 6, 1926 · 195 km SW of this epicenter
- 6.1187 km NW of Constitución, ChileMay 21, 1922 · 106 km W of this epicenter
- 6.022 km S of Constitución, ChileAugust 11, 1925 · 195 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 20 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 4,079 recorded deaths. The most severe:
- 1906M8.2
South Central
17 Aug 1906 · 112 km away · intensity XI
4,000 deaths$100 million damagetsunami
- 1822M8.5
Valparaiso, Quillota, Concon, Aconcagua
20 Nov 1822 · 112 km away · intensity XI
72 deathsExtreme damage ($25M+)tsunami
- 1730M9.1
Valparaiso
8 Jul 1730 · 185 km away · intensity XI
5 deathsSevere damage ($5–24M)tsunami
- 1880M7.7
Illapel
15 Aug 1880 · 283 km away · intensity X
2 deathsSevere damage ($5–24M)tsunami
- 1871M7.5
Central
25 Mar 1871 · 135 km away
Severe damage ($5–24M)tsunami
- 1851M7.1
Valparaiso
2 Apr 1851 · 133 km away · intensity VIII
Severe damage ($5–24M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.