QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

20 km SE of Chickaloon, Alaska

· 23 km deep · released about 21 lb of TNT

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10 km30 km60 km120 km N Anchorage Municipality 82 kmMatanuska-Susitna Borough 95 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 1.9 (ml)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 82 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1143 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 61.6846, -148.1671. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 82 km (51 mi) NE of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 95 km (59 mi) SE 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

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

  1. 1.7 28 km N of Chickaloon, Alaska
  2. 1.9 20 km N of Glacier View, Alaska
  3. 1.6 30 km SE of Chickaloon, Alaska
  4. 2.3 34 km SW of Glacier View, Alaska
  5. 1.6 20 km N of Chickaloon, Alaska
  6. 2.0 48 km SSW of Glacier View, Alaska
  7. 1.8 28 km SSE of Chickaloon, Alaska
  8. 2.4 21 km SSW of Glacier View, Alaska
  9. 2.4 13 km ESE of Lazy Mountain, Alaska
  10. 2.1 25 km N of Chickaloon, Alaska
  11. 1.8 19 km ENE of Chickaloon, Alaska
  12. 1.5 16 km ESE of Lazy Mountain, Alaska
  13. 2.7 17 km S of Glacier View, Alaska
  14. 1.6 26 km SSE of Chickaloon, Alaska
  15. 2.0 12 km ESE of Chickaloon, 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 4.6 on 2018-01-27 — it released about 11,000 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.