QuakeIndex

Earthquake · reviewed by a seismologist

M 5.8mw

7 km NNW of Anchorage, Alaska

· 41 km deep · released about 7.6 kilotons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 38 kmMatanuska-Susitna Borough 112 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 5.8 (mw)
Depth
41 km below the surface
Felt
122 reports · strongest reported intensity VIII
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Nearest
Anchorage Municipality, 38 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1137 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 122 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.8 would have released about 32 times as much.

  1. Ridgecrest, California 2019 M 7.1 89× the energy of this one
  2. Loma Prieta, California 1989 M 6.9 45× the energy of this one
  3. Northridge, California 1994 M 6.7 22× the energy of this one
  4. This earthquake M 5.8 about 7.6 kilotons of TNT
  5. Magna, Utah 2020 M 5.7 this one released 1.4× more
  6. Around the size people start to feel M 3.0 this one released 16,000× 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 61.2822, -149.9571. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 38 km (24 mi) WNW of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 112 km (70 mi) SSW of here earthquakes near Matanuska-Susitna Borough

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. 3.0 2 km NE of Big Lake, Alaska
  2. 2.8 3 km WNW of Point MacKenzie, Alaska
  3. 2.2 2 km E of Big Lake, Alaska
  4. 2.5 8 km NNW of Anchorage, Alaska
  5. 2.3 7 km SSE of Big Lake, Alaska
  6. 2.3 10 km NW of Point MacKenzie, Alaska
  7. 2.4 6 km WSW of Knik, Alaska
  8. 2.5 8 km N of Point MacKenzie, Alaska
  9. 3.6 6 km NW of Point MacKenzie, Alaska
  10. 3.6 7 km WSW of Knik, Alaska
  11. 3.0 7 km NW of Point MacKenzie, Alaska
  12. 3.2 2 km SSE of Big Lake, Alaska
  13. 3.2 8 km NW of Point MacKenzie, Alaska
  14. 2.5 3 km NNW of Point MacKenzie, Alaska
  15. 3.0 6 km NW of Point MacKenzie, 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 7.1 on 2018-11-30 — it released about 89 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.