Reviewed by USGSAlaska2y ago
M2.7 earthquake 179 km SE of Unalaska, Alaska
Thursday, August 1, 2024, 10:43:12 UTC · 52.574°N, 164.941°W
A magnitude 2.7 earthquake struck 179 km SE of Unalaska, Alaska on Thursday, August 1, 2024, 10:43:12 UTC, at a depth of 10.0 km (shallow).
- Magnitude
- 2.7
- 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
169 kg of TNT
That is about 1/88,990 of the Hiroshima bomb. A magnitude 5.0 releases about 2,818 times more energy.
Tectonic setting
18 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 535 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 · 174 km NE of this epicenter
- 7.881 km E of Nikolski, AlaskaJuly 2, 1965 · 189 km W of this epicenter
- 7.139 km S of Akutan, AlaskaMarch 22, 1957 · 145 km N of this epicenter
- 7.135 km SW of Nikolski, AlaskaMarch 11, 1957 · 287 km W of this epicenter
- 7.0203 km SSE of Unalaska, AlaskaAugust 22, 1940 · 60 km SW of this epicenter
- 6.980 km E of Nikolski, AlaskaMarch 24, 1980 · 189 km W of this epicenter
- 6.967 km SW of Unalaska, AlaskaFebruary 27, 1987 · 186 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 8 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 · 174 km away · intensity VI
168 deaths$26 million damagetsunami
- 1965M6.5
Aleutian Islands: Fox Islands
2 Jul 1965 · 183 km away
Limited damage (under $1M)tsunami
- 1902M7.8
Aleutian Islands: Fox Islands
1 Jan 1902 · 174 km away
- 1957M7.5
Aleutian Islands: Fox Islands
22 Mar 1957 · 270 km away · intensity V
- 1962M6.5
Aleutian Islands: Fox Islands
21 Dec 1962 · 244 km away
tsunami
- 1820
East Aleutian Islands
1 Mar 1820 · 217 km away
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.