Reviewed by USGSAlaska4y ago
M3.0 earthquake 136 km SSE of Sand Point, Alaska
Saturday, June 18, 2022, 19:39:57 UTC · 54.188°N, 159.750°W
A magnitude 3.0 earthquake struck 136 km SSE of Sand Point, Alaska on Saturday, June 18, 2022, 19:39:57 UTC, at a depth of 10.0 km (shallow).
- Magnitude
- 3.0
- Minor · ml
- Depth
- 10 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
477 kg of TNT
That is about 1/31,575 of the Hiroshima bomb. A magnitude 5.0 releases about 1,000 times more energy.
Tectonic setting
42 km
from the nearest mapped plate boundary, between the North American and Pacific plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
10 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 12 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.2 on June 25, 2022. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 2.8104 km SSE of Sand Point, Alaska4y ago · 36 km N of this epicenter
- 2.9124 km SSE of Sand Point, Alaska4y ago · 12 km N of this epicenter
- 2.7115 km SSE of Sand Point, Alaska4y ago · 25 km N of this epicenter
- 3.1109 km SSE of Sand Point, Alaska4y ago · 30 km N of this epicenter
- 2.7118 km SSE of Sand Point, Alaska4y ago · 21 km N of this epicenter
- 2.898 km SSE of Sand Point, Alaska4y ago · 46 km N of this epicenter
- 2.8110 km SSE of Sand Point, Alaska4y ago · 29 km N of this epicenter
- 3.2144 km SSE of Sand Point, Alaska4y ago · 8 km SE of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 373 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 · 217 km W of this epicenter
- 8.21938 Semidi Islands, Alaska EarthquakeNovember 10, 1938 · 149 km NE of this epicenter
- 8.22021 Chignik, Alaska EarthquakeJuly 29, 2021 · 177 km NE of this epicenter
- 7.82020 Perryville, Alaska EarthquakeJuly 22, 2020 · 123 km NE of this epicenter
- 7.62020 Sand Point, Alaska EarthquakeOctober 19, 2020 · 47 km N of this epicenter
- 7.454 km SE of Sand Point, AlaskaMay 31, 1917 · 90 km N of this epicenter
- 7.190 km SE of King Cove, AlaskaMay 14, 1948 · 102 km NW of this epicenter
- 7.0113 km ESE of Chignik, AlaskaMay 4, 1923 · 264 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 9 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 168 recorded deaths. The most severe:
- 1946M8.6
Unimak Island
1 Apr 1946 · 217 km away · intensity VI
168 deaths$26 million damagetsunami
- 2020M7.8
Alaska
22 Jul 2020 · 123 km away · intensity VII
Limited damage (under $1M)tsunami
- 1938M8.2
Alaska
10 Nov 1938 · 169 km away · intensity VI
tsunami
- 2021M8.2
Alaska Peninsula
29 Jul 2021 · 176 km away · intensity VIII
tsunami
- 1788M8.0
Alaska Peninsula
6 Aug 1788 · 121 km away
tsunami
- 2020M7.6
Alaska
19 Oct 2020 · 47 km away · intensity IX
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.