QuakeIndex

Earthquake · automatic estimate, may change

M 2.2ml

15 km ESE of Girdwood, Alaska

· 20 km deep · released about 60 lb of TNT

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10 km30 km60 km120 km N Anchorage Municipality 37 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 2.2 (ml)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 37 km NNW
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 330 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 60.8939, -148.9079. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 37 km (23 mi) SSE of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 1.8 6 km WNW of Girdwood, Alaska
  2. 1.7 19 km NNE of Moose Pass, Alaska
  3. 2.0 20 km SSE of Sunrise, Alaska
  4. 2.4 20 km SW of Whittier, Alaska
  5. 1.8 13 km WNW of Whittier, Alaska
  6. 2.2 27 km SSE of Whittier, Alaska
  7. 1.7 22 km SSE of Whittier, Alaska
  8. 2.0 20 km E of Eagle River, Alaska
  9. 1.6 7 km WSW of Whittier, Alaska
  10. 2.2 9 km ESE of Whittier, Alaska
  11. 2.1 22 km NE of Moose Pass, Alaska
  12. 1.6 37 km NNE of Whittier, Alaska
  13. 1.8 18 km N of Moose Pass, Alaska
  14. 1.8 15 km ENE of Girdwood, Alaska
  15. 2.2 7 km SE of Sunrise, 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 4.2 on 2020-06-18 — it released about 1,000 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.