Reviewed by USGSAlaska2y ago
M3.1 earthquake 61 km SSW of King Cove, Alaska
Saturday, May 11, 2024, 04:47:36 UTC · 54.524°N, 162.542°W
A magnitude 3.1 earthquake struck 61 km SSW of King Cove, Alaska on Saturday, May 11, 2024, 04:47:36 UTC, at a depth of 85.4 km (intermediate).
- Magnitude
- 3.1
- Minor · ml
- Depth
- 85 km
- Intermediate
- 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
674 kg of TNT
That is about 1/22,353 of the Hiroshima bomb. A magnitude 5.0 releases about 708 times more energy.
Tectonic setting
125 km
from the nearest mapped plate boundary, between the North American and Pacific plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: intermediate
85 km
Intermediate-depth earthquakes usually break inside a plate that is sinking into the mantle. Shaking spreads over a wide area but is gentler at the epicenter than a shallow quake of the same size.
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 3 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.1 on May 21, 2024. 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 394 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 · 116 km S of this epicenter
- 8.21938 Semidi Islands, Alaska EarthquakeNovember 10, 1938 · 288 km E of this epicenter
- 7.82020 Perryville, Alaska EarthquakeJuly 22, 2020 · 260 km E of this epicenter
- 7.62020 Sand Point, Alaska EarthquakeOctober 19, 2020 · 188 km E of this epicenter
- 7.454 km SE of Sand Point, AlaskaMay 31, 1917 · 178 km E of this epicenter
- 7.22023 Sand Point, Alaska EarthquakeJuly 16, 2023 · 116 km E of this epicenter
- 7.190 km SE of King Cove, AlaskaMay 14, 1948 · 89 km E of this epicenter
- 7.139 km S of Akutan, AlaskaMarch 22, 1957 · 226 km W of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 11 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 169 recorded deaths. The most severe:
- 1946M8.6
Unimak Island
1 Apr 1946 · 116 km away · intensity VI
168 deaths$26 million damagetsunami
- 2023M7.2
Alaska Peninsula
16 Jul 2023 · 115 km away · intensity VI
1 deathtsunami
- 2020M7.8
Alaska
22 Jul 2020 · 260 km away · intensity VII
Limited damage (under $1M)tsunami
- 1938M8.2
Alaska
10 Nov 1938 · 286 km away · intensity VI
tsunami
- 1788M8.0
Alaska Peninsula
6 Aug 1788 · 112 km away
tsunami
- 2020M7.6
Alaska
19 Oct 2020 · 188 km away · intensity IX
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.