M2.9 earthquake 104 km ESE of Akutan, Alaska

Monday, March 28, 2022, 05:17:14 UTC · 53.955°N, 164.208°W

A magnitude 2.9 earthquake struck 104 km ESE of Akutan, Alaska on Monday, March 28, 2022, 05:17:14 UTC, at a depth of 89.4 km (intermediate).

Magnitude: 2.9; Minor · ml
Depth: 89 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

338 kg of TNT

That is about 1/44,601 of the Hiroshima bomb. A magnitude 5.0 releases about 1,413 times more energy.

Tectonic setting

105 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

89 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 12 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.7 on April 25, 2022. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 466 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

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 · 104 km away · intensity VI
168 deaths$26 million damagetsunami
1965M6.5
Aleutian Islands: Fox Islands
2 Jul 1965 · 244 km away
Limited damage (under $1M)tsunami
1788M8.0
Alaska Peninsula
6 Aug 1788 · 238 km away
tsunami
1902M7.8
Aleutian Islands: Fox Islands
1 Jan 1902 · 279 km away
1948M7.5
Alaska Peninsula
14 May 1948 · 217 km away
1957M7.5
Aleutian Islands: Fox Islands
22 Mar 1957 · 133 km away · intensity V

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

Nearby trackers