Reviewed by USGSAlaska4y ago
M2.5 earthquake 57 km ESE of King Salmon, Alaska
Tuesday, August 2, 2022, 20:49:54 UTC · 58.410°N, 155.826°W
A magnitude 2.5 earthquake struck 57 km ESE of King Salmon, Alaska on Tuesday, August 2, 2022, 20:49:54 UTC, at a depth of 158.6 km (intermediate).
- Magnitude
- 2.5
- Minor · ml
- Depth
- 159 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 earthquake
In context
How big was it, and why here?
Energy released
85 kg of TNT
That is about 1/177,558 of the Hiroshima bomb. A magnitude 5.0 releases about 5,623 times more energy.
Tectonic setting
334 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
159 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 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 349 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.147 km ESE of Pedro Bay, AlaskaJanuary 24, 2016 · 196 km NE of this epicenter
- 7.14 km ENE of Karluk, AlaskaNovember 7, 1912 · 124 km SE of this epicenter
- 7.0113 km ESE of Chignik, AlaskaMay 4, 1923 · 291 km S of this epicenter
- 7.026 km SSE of Karluk, AlaskaDecember 6, 1999 · 147 km SE of this epicenter
- 6.9112 km E of Chignik, AlaskaOctober 11, 2021 · 240 km S of this epicenter
- 6.9143 km ESE of Chignik, AlaskaFebruary 13, 1951 · 291 km S of this epicenter
- 6.9171 km SW of Akhiok, AlaskaFebruary 6, 1964 · 299 km S 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. The most severe:
- 1900M8.3
Kodiak Island
9 Oct 1900 · 202 km away · intensity VIII
Limited damage (under $1M)
- 1788M8.0
Unga Island
21 Jul 1788 · 230 km away · intensity VII
Limited damage (under $1M)tsunami
- 2016M7.1
Kenai
24 Jan 2016 · 196 km away · intensity VII
Limited damage (under $1M)
- 1970M6.0
Andreanof Islands
11 Mar 1970 · 152 km away · intensity V
Limited damage (under $1M)tsunami
- 1792
Kodiak Island
1792 · 276 km away · intensity VII
Limited damage (under $1M)tsunami
- 1906M7.6
Aleutian Islands
23 Dec 1906 · 208 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.