QuakeScout
Magnitude2.7

Reviewed by USGSAlaska2y ago

M2.7 earthquake 58 km SE of Unalaska, Alaska

Monday, May 27, 2024, 02:22:10 UTC · 53.483°N, 165.933°W

A magnitude 2.7 earthquake struck 58 km SE of Unalaska, Alaska on Monday, May 27, 2024, 02:22:10 UTC, at a depth of 35.0 km (shallow).

Magnitude
2.7
Minor · ml
Depth
35 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

169 kg of TNT

That is about 1/88,990 of the Hiroshima bomb. A magnitude 5.0 releases about 2,818 times more energy.

Tectonic setting

100 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

35 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 5 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M3.4 on June 18, 2024. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

M31h6h1d3d7d14d30dMainshock M2.7
Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.
  1. 3.378 km SSE of Akutan, Alaska2y ago · 47 km E of this epicenter
  2. 3.479 km SSE of Akutan, Alaska2y ago · 50 km E of this epicenter
  3. 2.781 km SSE of Akutan, Alaska2y ago · 44 km E of this epicenter
  4. 2.766 km SSE of Unalaska, Alaska2y ago · 20 km SW of this epicenter
  5. 2.567 km SSE of Akutan, Alaska2y ago · 48 km E of this epicenter

Regional history

Past M5+ earthquakes within 300 km

USGS lists 633 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

  1. 8.6The 1946 Unimak Island, Alaska EarthquakeApril 1, 1946 · 205 km E of this epicenter
  2. 7.881 km E of Nikolski, AlaskaJuly 2, 1965 · 126 km SW of this epicenter
  3. 7.139 km S of Akutan, AlaskaMarch 22, 1957 · 34 km N of this epicenter
  4. 7.135 km SW of Nikolski, AlaskaMarch 11, 1957 · 235 km W of this epicenter
  5. 7.0203 km SSE of Unalaska, AlaskaAugust 22, 1940 · 150 km S of this epicenter
  6. 6.980 km SW of Nikolski, AlaskaMarch 9, 1957 · 273 km SW of this epicenter
  7. 6.977 km SSW of Nikolski, AlaskaJanuary 23, 1935 · 267 km SW of this epicenter

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 12 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 168 recorded deaths. The most severe:

  1. 1946M8.6

    Unimak Island

    1 Apr 1946 · 205 km away · intensity VI

    168 deaths$26 million damagetsunami

  2. 1965M6.5

    Aleutian Islands: Fox Islands

    2 Jul 1965 · 119 km away

    Limited damage (under $1M)tsunami

  3. 1917M7.9

    Alaska Peninsula

    31 May 1917 · 253 km away · intensity V

  4. 1902M7.8

    Aleutian Islands: Fox Islands

    1 Jan 1902 · 160 km away

  5. 1907M7.8

    Aleutian Islands

    2 Sep 1907 · 273 km away

  6. 1916M7.5

    Aleutian Islands: Fox Islands

    18 Apr 1916 · 270 km away

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

Nearby trackers

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