Reviewed by USGS16d ago
M4.4 earthquake southern East Pacific Rise
Thursday, September 10, 2026, 17:54:22 UTC · 34.804°S, 108.987°W
A magnitude 4.4 earthquake struck southern East Pacific Rise on Thursday, September 10, 2026, 17:54:22 UTC, at a depth of 10.0 km (shallow).
- Magnitude
- 4.4
- Light · mb
- Depth
- 10 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 earthquakeDashed circle: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
60 tons of TNT
That is about 1/251 of the Hiroshima bomb. A magnitude 5.0 releases about 8 times more energy.
Tectonic setting
5 km
from the nearest mapped plate boundary, between the Antarctic and Nazca plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
10 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 50 km
USGS lists 1 M2.5+ earthquake within 50 km since this event; the largest was M5.4 on September 10, 2026. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 163 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.0southern East Pacific RiseMarch 20, 1920 · 196 km SW of this epicenter
- 6.7southern East Pacific RiseMay 19, 2021 · 197 km N of this epicenter
- 6.5southern East Pacific RiseJune 10, 1997 · 136 km SE of this epicenter
- 6.3southern East Pacific RiseMarch 7, 1940 · 225 km NW of this epicenter
- 6.3southern East Pacific RiseFebruary 23, 2024 · 166 km W of this epicenter
- 6.3southern East Pacific RiseOctober 1, 1988 · 273 km E of this epicenter
- 6.2southern East Pacific RiseAugust 28, 1952 · 260 km E of this epicenter
- 6.2southern East Pacific RiseJuly 14, 1929 · 79 km NW of this epicenter