QuakeIndex

Earthquake · reviewed by a seismologist

M 5.3ml

20 km NE of Nabesna, Alaska

· 8.9 km deep · released about 1.3 kilotons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Copper River Census Area 81 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 5.3 (ml)
Depth
8.9 km below the surface
Felt
25 reports · strongest reported intensity V
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Copper River Census Area, 81 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1150 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 25 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.3 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5.6× the energy of this one
  3. Magna, Utah 2020 M 5.7 4× the energy of this one
  4. This earthquake M 5.3 about 1.3 kilotons of TNT
  5. Around the size people start to feel M 3.0 this one released 2,800× 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 62.5120, -142.7477. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Copper River Census Area, AK 81 km (50 mi) NE of here earthquakes near Copper River Census Area

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

Aftershocks so far

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

  1. 1.5 19 km E of Nabesna, Alaska
  2. 2.0 41 km N of Nabesna, Alaska
  3. 1.5 16 km NNE of Nabesna, Alaska
  4. 1.7 20 km E of Nabesna, Alaska
  5. 1.7 18 km E of Nabesna, Alaska
  6. 1.7 28 km NNW of Nabesna, Alaska
  7. 1.5 6 km ENE of Nabesna, Alaska
  8. 1.6 15 km ENE of Nabesna, Alaska
  9. 1.7 27 km ENE of Nabesna, Alaska
  10. 1.5 26 km WSW of Northway, Alaska
  11. 2.3 Central Alaska
  12. 2.2 22 km SSW of Nabesna, Alaska
  13. 1.5 22 km NE of Nabesna, Alaska
  14. 2.0 17 km NE of Nabesna, Alaska
  15. 1.7 35 km N of Nabesna, 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.