QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

32 km WSW of Susitna, Alaska

· 63 km deep · released about 43 lb of TNT

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10 km30 km60 km120 km N Anchorage Municipality 102 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 2.1 (ml)
Depth
63 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 102 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 279 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 61.4620, -151.1030. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 102 km (63 mi) WNW of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 123 km (76 mi) SW 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

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

  1. 1.8 16 km WNW of Susitna, Alaska
  2. 1.9 26 km NNW of Susitna, Alaska
  3. 1.8 20 km WNW of Susitna, Alaska
  4. 1.5 34 km SSE of Skwentna, Alaska
  5. 2.2 23 km SSW of Susitna, Alaska
  6. 2.2 14 km NNW of Susitna, Alaska
  7. 1.8 49 km NNW of Beluga, Alaska
  8. 1.7 14 km NW of Beluga, Alaska
  9. 1.9 24 km WNW of Susitna, Alaska
  10. 1.7 48 km NNW of Beluga, Alaska
  11. 1.9 10 km NNW of Susitna, Alaska
  12. 2.0 11 km NNW of Susitna, Alaska
  13. 2.3 25 km WNW of Susitna, Alaska
  14. 2.3 22 km WNW of Tyonek, Alaska
  15. 1.7 39 km NNW of Beluga, 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 5.2 on 2019-09-17 — it released about 45,000 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.