QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0ml

27 km ENE of Knik River, Alaska

· 22 km deep · released about 30 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 61 kmMatanuska-Susitna Borough 100 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 2.0 (ml)
Depth
22 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Anchorage Municipality, 61 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 493 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 350,000× the energy of this one
  3. Around the size people start to feel M 3.0 32× the energy of this one
  4. This earthquake M 2.0 about 30 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 61.5295, -148.4144. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 61 km (38 mi) NE of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 100 km (62 mi) SE of here earthquakes near Matanuska-Susitna Borough
Chugach Census Area, AK 166 km (103 mi) NW of here earthquakes near Chugach Census Area

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

Aftershocks so far

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

  1. 2.2 13 km NNE of Sutton-Alpine, Alaska
  2. 1.5 31 km SSE of Chickaloon, Alaska
  3. 1.6 30 km SSE of Chickaloon, Alaska
  4. 1.8 9 km ENE of Knik River, Alaska
  5. 1.8 35 km SSE of Chickaloon, Alaska
  6. 1.6 8 km SSW of Chickaloon, Alaska
  7. 1.5 19 km ESE of Chickaloon, Alaska
  8. 1.6 23 km SE of Chickaloon, Alaska
  9. 2.1 33 km SE of Chickaloon, Alaska
  10. 1.7 11 km E of Knik River, Alaska
  11. 1.8 20 km ESE of Chickaloon, Alaska
  12. 2.2 25 km SSE of Knik River, Alaska
  13. 2.8 11 km N of Sutton-Alpine, Alaska
  14. 1.8 30 km SSW of Glacier View, Alaska
  15. 1.5 28 km SSE 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 7,900 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.