QuakeIndex

Earthquake · reviewed by a seismologist

M 4.9ml

7 km N of Anchorage, Alaska

· 46 km deep · released about 340 tons of TNT

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10 km30 km60 km120 km N Anchorage Municipality 36 kmMatanuska-Susitna Borough 111 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 4.9 (ml)
Depth
46 km below the surface
Felt
no reports yet
Measured shaking
intensity IV (ShakeMap)
Nearest
Anchorage Municipality, 36 km ESE
Status
Reviewed by a seismologist

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

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 340 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 500× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 22× the energy of this one
  3. Magna, Utah 2020 M 5.7 16× the energy of this one
  4. This earthquake M 4.9 about 340 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 710× 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 61.2833, -149.9082. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 36 km (22 mi) WNW of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 111 km (69 mi) S 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 4 km SSE of Big Lake, Alaska
  2. 3.0 2 km NE of Big Lake, Alaska
  3. 2.8 3 km WNW of Point MacKenzie, Alaska
  4. 2.2 2 km E of Big Lake, Alaska
  5. 2.5 8 km NNW of Anchorage, Alaska
  6. 2.3 7 km SSE of Big Lake, Alaska
  7. 2.3 10 km NW of Point MacKenzie, Alaska
  8. 2.4 6 km WSW of Knik, Alaska
  9. 2.5 8 km N of Point MacKenzie, Alaska
  10. 3.6 6 km NW of Point MacKenzie, Alaska
  11. 3.6 7 km WSW of Knik, Alaska
  12. 3.0 7 km NW of Point MacKenzie, Alaska
  13. 3.2 2 km SSE of Big Lake, Alaska
  14. 3.2 8 km NW of Point MacKenzie, Alaska
  15. 2.5 3 km NNW 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 2,000 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.