Reviewed by USGSAlaska2y ago
M2.6 earthquake 78 km SSE of False Pass, Alaska
Wednesday, August 28, 2024, 12:25:33 UTC · 54.266°N, 162.737°W
A magnitude 2.6 earthquake struck 78 km SSE of False Pass, Alaska on Wednesday, August 28, 2024, 12:25:33 UTC, at a depth of 35.0 km (shallow).
- Magnitude
- 2.6
- Minor · ml
- Depth
- 35 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
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
101 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: shallow
35 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 5 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.1 on August 30, 2024. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 2.777 km S of King Cove, Alaska2y ago · 20 km NE of this epicenter
- 2.960 km S of King Cove, Alaska2y ago · 38 km NE of this epicenter
- 2.969 km S of King Cove, Alaska2y ago · 26 km NE of this epicenter
- 2.986 km S of False Pass, Alaska2y ago · 44 km SW of this epicenter
- 3.1103 km S of False Pass, Alaska2y ago · 50 km SW of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 408 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 · 86 km S of this epicenter
- 7.82020 Perryville, Alaska EarthquakeJuly 22, 2020 · 281 km E of this epicenter
- 7.62020 Sand Point, Alaska EarthquakeOctober 19, 2020 · 205 km E of this epicenter
- 7.454 km SE of Sand Point, AlaskaMay 31, 1917 · 201 km NE of this epicenter
- 7.22023 Sand Point, Alaska EarthquakeJuly 16, 2023 · 129 km E of this epicenter
- 7.190 km SE of King Cove, AlaskaMay 14, 1948 · 108 km E of this epicenter
- 7.139 km S of Akutan, AlaskaMarch 22, 1957 · 205 km W of this epicenter
- 7.071 km SE of King Cove, AlaskaMay 30, 1991 · 80 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 10 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 · 86 km away · intensity VI
168 deaths$26 million damagetsunami
- 2023M7.2
Alaska Peninsula
16 Jul 2023 · 130 km away · intensity VI
1 deathtsunami
- 2020M7.8
Alaska
22 Jul 2020 · 281 km away · intensity VII
Limited damage (under $1M)tsunami
- 1788M8.0
Alaska Peninsula
6 Aug 1788 · 138 km away
tsunami
- 2020M7.6
Alaska
19 Oct 2020 · 205 km away · intensity IX
tsunami
- 1948M7.5
Alaska Peninsula
14 May 1948 · 115 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.