QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

36 km WNW of Valdez, Alaska

· 20 km deep · released about 950 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Chugach Census Area 97 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 3.0 (ml)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Chugach Census Area, 97 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1422 days ago

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

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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.

Where

Epicentre 61.2883, -146.9350. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Chugach Census Area, AK 97 km (60 mi) NNW of here earthquakes near Chugach 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. 2.1 29 km NW of Valdez, Alaska
  2. 1.5 42 km WNW of Tatitlek, Alaska
  3. 1.6 36 km SSE of Nelchina, Alaska
  4. 2.5 35 km WNW of Valdez, Alaska
  5. 1.6 25 km NW of Valdez, Alaska
  6. 2.3 29 km NW of Valdez, Alaska
  7. 2.4 29 km NW of Valdez, Alaska
  8. 1.6 42 km NNW of Valdez, Alaska
  9. 2.2 Southern Alaska
  10. 1.5 40 km NNW of Valdez, Alaska
  11. 1.5 42 km SSE of Nelchina, Alaska
  12. 2.0 46 km SSE of Nelchina, Alaska
  13. 1.5 Southern Alaska
  14. 1.5 15 km NNE of Tatitlek, Alaska
  15. 1.6 40 km NW of Valdez, 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 4.4 on 2022-07-09 — it released about 130 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.