QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9mb

19 km E of King Cove, Alaska

· 98 km deep · released about 11 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aleutians East Borough 21 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 3.9 (mb)
Depth
98 km below the surface
Felt
1 report · strongest reported intensity I
Measured shaking
intensity III (ShakeMap)
Nearest
Aleutians East Borough, 21 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 865 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 710× the energy of this one
  3. Magna, Utah 2020 M 5.7 500× the energy of this one
  4. This earthquake M 3.9 about 11 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× more

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.

Where

Epicentre 55.0533, -162.0203. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 21 km (13 mi) S of here earthquakes near Aleutians East Borough

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

Aftershocks so far

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

  1. 1.7 4 km ESE of King Cove, Alaska
  2. 2.1 26 km ENE of Cold Bay, Alaska
  3. 3.7 20 km ESE of King Cove, Alaska
  4. 1.7 49 km SE of King Cove, Alaska
  5. 1.5 5 km NNW of King Cove, Alaska
  6. 2.0 51 km SSE of King Cove, Alaska
  7. 1.9 39 km ENE of King Cove, Alaska
  8. 1.6 36 km NNE of King Cove, Alaska
  9. 1.9 56 km ENE of King Cove, Alaska
  10. 4.2 59 km ESE of King Cove, Alaska
  11. 1.6 1 km ESE of King Cove, Alaska
  12. 1.5 3 km ESE of King Cove, Alaska
  13. 1.8 4 km ESE of King Cove, Alaska
  14. 1.8 41 km SE of King Cove, Alaska
  15. 1.9 32 km E of King Cove, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.7 on 2016-09-06 — it released about 16 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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