Reviewed by USGSAlaska5y ago
M2.6 earthquake 209 km SE of Akutan, Alaska
Friday, September 24, 2021, 18:29:39 UTC · 52.607°N, 163.935°W
A magnitude 2.6 earthquake struck 209 km SE of Akutan, Alaska on Friday, September 24, 2021, 18:29:39 UTC, at a depth of 10.0 km (shallow).
- Magnitude
- 2.6
- Minor · ml
- 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 earthquake
In context
How big was it, and why here?
Energy released
120 kg of TNT
That is about 1/125,702 of the Hiroshima bomb. A magnitude 5.0 releases about 3,981 times more energy.
Tectonic setting
39 km
from the nearest mapped plate boundary, between the North American and Pacific 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 has not published any M2.5+ earthquake within 50 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 435 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.6The 1946 Unimak Island, Alaska EarthquakeApril 1, 1946 · 123 km NE of this epicenter
- 7.881 km E of Nikolski, AlaskaJuly 2, 1965 · 254 km W of this epicenter
- 7.190 km SE of King Cove, AlaskaMay 14, 1948 · 287 km NE of this epicenter
- 7.139 km S of Akutan, AlaskaMarch 22, 1957 · 179 km NW of this epicenter
- 7.071 km SE of King Cove, AlaskaMay 30, 1991 · 267 km NE of this epicenter
- 7.0203 km SSE of Unalaska, AlaskaAugust 22, 1940 · 117 km SW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 7 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 168 recorded deaths. The most severe:
- 1946M8.6
Unimak Island
1 Apr 1946 · 123 km away · intensity VI
168 deaths$26 million damagetsunami
- 1965M6.5
Aleutian Islands: Fox Islands
2 Jul 1965 · 247 km away
Limited damage (under $1M)tsunami
- 1902M7.8
Aleutian Islands: Fox Islands
1 Jan 1902 · 242 km away
- 1948M7.5
Alaska Peninsula
14 May 1948 · 286 km away
- 1957M7.5
Aleutian Islands: Fox Islands
22 Mar 1957 · 279 km away · intensity V
- 1820
East Aleutian Islands
1 Mar 1820 · 218 km away
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.