Reviewed by USGSAlaska4y ago
M2.8 earthquake 62 km W of Karluk, Alaska
Tuesday, April 12, 2022, 08:29:10 UTC · 57.563°N, 155.500°W
A magnitude 2.8 earthquake struck 62 km W of Karluk, Alaska on Tuesday, April 12, 2022, 08:29:10 UTC, at a depth of 85.6 km (intermediate).
- Magnitude
- 2.8
- Minor · ml
- Depth
- 86 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
239 kg of TNT
That is about 1/63,000 of the Hiroshima bomb. A magnitude 5.0 releases about 1,995 times more energy.
Tectonic setting
254 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
86 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 2 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M2.7 on May 10, 2022. 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 403 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.22021 Chignik, Alaska EarthquakeJuly 29, 2021 · 285 km SW of this epicenter
- 7.9Kodiak Island region, AlaskaOctober 9, 1900 · 270 km E of this epicenter
- 7.147 km ESE of Pedro Bay, AlaskaJanuary 24, 2016 · 261 km NE of this epicenter
- 7.14 km ENE of Karluk, AlaskaNovember 7, 1912 · 66 km E of this epicenter
- 7.0113 km ESE of Chignik, AlaskaMay 4, 1923 · 207 km SW of this epicenter
- 7.026 km SSE of Karluk, AlaskaDecember 6, 1999 · 73 km E of this epicenter
- 7.0164 km SE of Chignik, AlaskaSeptember 4, 1989 · 256 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 13 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1900M8.3
Kodiak Island
9 Oct 1900 · 132 km away · intensity VIII
Limited damage (under $1M)
- 1788M8.0
Unga Island
21 Jul 1788 · 163 km away · intensity VII
Limited damage (under $1M)tsunami
- 2016M7.1
Kenai
24 Jan 2016 · 261 km away · intensity VII
Limited damage (under $1M)
- 1970M6.0
Andreanof Islands
11 Mar 1970 · 96 km away · intensity V
Limited damage (under $1M)tsunami
- 1792
Kodiak Island
1792 · 219 km away · intensity VII
Limited damage (under $1M)tsunami
- 1938M8.2
Alaska
10 Nov 1938 · 291 km away · intensity VI
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.