QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

110 km SE of King Cove, Alaska

Yes. A magnitude 2.9 earthquake was recorded 110 km SE of King Cove, Alaska, at 1:25 pm AKDT on 29 May 2018 (21:25 UTC), 20 km deep.

· 20 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aleutians East Borough 118 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.9 (ml)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 118 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1187 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 24 km (15 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.9 on 2018-04-14 — about 1,000 times the energy of this one.

Before 2016, the USGS record lists 42 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.1 90 km SE of King Cove, Alaska · 38 km NNE of this epicentre
  2. 7.0 71 km SE of King Cove, Alaska · 39 km NNW of this epicentre
  3. 6.7 68 km SSE of King Cove, Alaska · 43 km NW of this epicentre
  4. 6.6 72 km SE of King Cove, Alaska · 39 km NNW of this epicentre
  5. 6.4 101 km SSW of Sand Point, Alaska · 29 km NNE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 54.2613, -161.3080. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aleutians East Borough, AK 118 km (73 mi) NNW earthquakes near Aleutians East Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

57 earthquakes have been recorded within 50 km since this one.

  1. 2.0 87 km SE of King Cove, Alaska
  2. 1.9 94 km SSW of Sand Point, Alaska
  3. 3.0 99 km SE of King Cove, Alaska
  4. 2.8 99 km SSE of King Cove, Alaska
  5. 2.3 111 km SSW of Sand Point, Alaska
  6. 2.1 90 km SE of King Cove, Alaska
  7. 2.1 101 km SSW of Sand Point, Alaska
  8. 1.7 74 km SE of King Cove, Alaska
  9. 2.3 119 km SSW of Sand Point, Alaska
  10. 2.2 98 km SSE of King Cove, Alaska
  11. 3.8 99 km S of Sand Point, Alaska
  12. 3.1 102 km SSW of Sand Point, Alaska
  13. 1.9 103 km SSW of Sand Point, Alaska
  14. 2.1 91 km SSW of Sand Point, Alaska
  15. 1.8 99 km S of Sand Point, Alaska

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.