Reviewed by USGSAlaska4y ago
M3.0 earthquake 162 km ESE of Chignik, Alaska
Saturday, April 16, 2022, 21:39:12 UTC · 55.571°N, 156.136°W
A magnitude 3.0 earthquake struck 162 km ESE of Chignik, Alaska on Saturday, April 16, 2022, 21:39:12 UTC, at a depth of 2.7 km (shallow).
- Magnitude
- 3.0
- Minor · ml
- Depth
- 3 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
103 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
3 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 6 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M2.9 on April 23, 2022. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 2.7140 km SE of Chignik, Alaska4y ago · 40 km W of this epicenter
- 2.6150 km SE of Chignik, Alaska4y ago · 42 km SW of this epicenter
- 2.5163 km SSW of Akhiok, Alaska4y ago · 38 km NE of this epicenter
- 2.6154 km SSW of Akhiok, Alaska4y ago · 48 km NE of this epicenter
- 2.9155 km SSW of Akhiok, Alaska4y ago · 49 km E of this epicenter
- 2.6184 km SSW of Akhiok, Alaska4y ago · 33 km E of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 364 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.21938 Semidi Islands, Alaska EarthquakeNovember 10, 1938 · 136 km W of this epicenter
- 8.22021 Chignik, Alaska EarthquakeJuly 29, 2021 · 113 km W of this epicenter
- 7.82020 Perryville, Alaska EarthquakeJuly 22, 2020 · 165 km W of this epicenter
- 7.62020 Sand Point, Alaska EarthquakeOctober 19, 2020 · 247 km SW of this epicenter
- 7.454 km SE of Sand Point, AlaskaMay 31, 1917 · 246 km W of this epicenter
- 7.14 km ENE of Karluk, AlaskaNovember 7, 1912 · 249 km NE of this epicenter
- 7.0113 km ESE of Chignik, AlaskaMay 4, 1923 · 50 km NW of this epicenter
- 7.026 km SSE of Karluk, AlaskaDecember 6, 1999 · 226 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 11 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1900M8.3
Kodiak Island
9 Oct 1900 · 235 km away · intensity VIII
Limited damage (under $1M)
- 1788M8.0
Unga Island
21 Jul 1788 · 250 km away · intensity VII
Limited damage (under $1M)tsunami
- 2020M7.8
Alaska
22 Jul 2020 · 165 km away · intensity VII
Limited damage (under $1M)tsunami
- 1970M6.0
Andreanof Islands
11 Mar 1970 · 255 km away · intensity V
Limited damage (under $1M)tsunami
- 1938M8.2
Alaska
10 Nov 1938 · 141 km away · intensity VI
tsunami
- 2021M8.2
Alaska Peninsula
29 Jul 2021 · 111 km away · intensity VIII
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.