QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

32 km SW of Trapper Creek, Alaska

· 6.4 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Matanuska-Susitna Borough 61 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 1.8 (ml)
Depth
6.4 km below the surface
Felt
no reports yet
Nearest
Matanuska-Susitna Borough, 61 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 26 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 62.0910, -150.6200. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Matanuska-Susitna Borough, AK 61 km (38 mi) WSW of here earthquakes near Matanuska-Susitna Borough
Anchorage Municipality, AK 124 km (77 mi) NW of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 1.5 34 km ESE of Skwentna, Alaska
  2. 2.0 31 km SE of Skwentna, Alaska
  3. 2.2 33 km SE of Skwentna, Alaska
  4. 2.4 34 km ESE of Skwentna, Alaska
  5. 1.6 20 km SE of Skwentna, Alaska
  6. 2.0 13 km WNW of Willow, Alaska
  7. 3.2 27 km ESE of Skwentna, Alaska
  8. 1.5 6 km SSW of Trapper Creek, Alaska
  9. 1.7 17 km SSW of Petersville, Alaska
  10. 2.1 29 km NNW of Susitna, Alaska
  11. 1.7 25 km E of Skwentna, Alaska
  12. 1.6 10 km SSE of Petersville, Alaska
  13. 2.0 26 km ESE of Skwentna, Alaska
  14. 1.7 16 km NW of Susitna, Alaska
  15. 1.7 30 km SSW of Petersville, 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 130,000 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.