Reviewed by USGSAlaska4y ago
M3.4 earthquake 56 km SSE of King Salmon, Alaska
Saturday, July 2, 2022, 13:22:28 UTC · 58.249°N, 156.186°W
A magnitude 3.4 earthquake struck 56 km SSE of King Salmon, Alaska on Saturday, July 2, 2022, 13:22:28 UTC, at a depth of 148.0 km (intermediate).
- Magnitude
- 3.4
- Minor · ml
- Depth
- 148 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
2 tons of TNT
That is about 1/7,931 of the Hiroshima bomb. A magnitude 5.0 releases about 251 times more energy.
Tectonic setting
335 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
148 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 M2.9 on July 14, 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 332 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 · 223 km NE of this epicenter
- 7.14 km ENE of Karluk, AlaskaNovember 7, 1912 · 129 km SE of this epicenter
- 7.0113 km ESE of Chignik, AlaskaMay 4, 1923 · 270 km S of this epicenter
- 7.026 km SSE of Karluk, AlaskaDecember 6, 1999 · 149 km SE of this epicenter
- 6.9112 km E of Chignik, AlaskaOctober 11, 2021 · 219 km S of this epicenter
- 6.9143 km ESE of Chignik, AlaskaFebruary 13, 1951 · 272 km S of this epicenter
- 6.9171 km SW of Akhiok, AlaskaFebruary 6, 1964 · 282 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 · 206 km away · intensity VIII
Limited damage (under $1M)
- 1788M8.0
Unga Island
21 Jul 1788 · 235 km away · intensity VII
Limited damage (under $1M)tsunami
- 2016M7.1
Kenai
24 Jan 2016 · 223 km away · intensity VII
Limited damage (under $1M)
- 1970M6.0
Andreanof Islands
11 Mar 1970 · 159 km away · intensity V
Limited damage (under $1M)tsunami
- 1792
Kodiak Island
1792 · 285 km away · intensity VII
Limited damage (under $1M)tsunami
- 1906M7.6
Aleutian Islands
23 Dec 1906 · 207 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.