QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

17 km SSW of Knik River, Alaska

· 27 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 21 kmMatanuska-Susitna Borough 107 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
27 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 21 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1151 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 61.3237, -149.0575. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 21 km (13 mi) NE of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 107 km (67 mi) SSE 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

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

  1. 1.6 3 km N of Buffalo Soapstone, Alaska
  2. 1.5 1 km N of Eagle River, Alaska
  3. 1.6 3 km NNE of Girdwood, Alaska
  4. 1.6 6 km ESE of Knik River, Alaska
  5. 1.6 34 km NE of Girdwood, Alaska
  6. 1.5 9 km WSW of Fishhook, Alaska
  7. 1.6 16 km ESE of Elmendorf Air Force Base, Alaska
  8. 2.3 4 km NE of Meadow Lakes, Alaska
  9. 2.1 5 km NE of Meadow Lakes, Alaska
  10. 2.0 2 km SE of Elmendorf Air Force Base, Alaska
  11. 1.7 Southern Alaska
  12. 1.8 22 km NNE of Girdwood, Alaska
  13. 1.5 13 km SSW of Chickaloon, Alaska
  14. 1.5 13 km ENE of Eagle River, Alaska
  15. 1.9 2 km NNW of Eagle River, 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 4.0 on 2016-08-30 — it released about 1,400 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.