QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

22 km ENE of Point Possession, Alaska

· 43 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 58 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
43 km below the surface
Felt
6 reports · strongest reported intensity III
Nearest
Anchorage Municipality, 58 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 702 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 6 people have reported feeling it to USGS.

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 61.0065, -150.3096. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 58 km (36 mi) WSW of here earthquakes near Anchorage Municipality
Kenai Peninsula Borough, AK 131 km (81 mi) NE of here earthquakes near Kenai Peninsula Borough

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

Aftershocks so far

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

  1. 2.1 17 km SSW of Susitna, Alaska
  2. 2.0 25 km ENE of Beluga, Alaska
  3. 2.1 6 km NNW of Point MacKenzie, Alaska
  4. 1.6 25 km SSW of Susitna, Alaska
  5. 1.5 17 km NNE of Point Possession, Alaska
  6. 1.9 8 km NW of Point MacKenzie, Alaska
  7. 1.6 27 km SSW of Anchorage, Alaska
  8. 1.6 29 km NE of Sterling, Alaska
  9. 1.5 30 km ENE of Beluga, Alaska
  10. 1.7 7 km NW of Point MacKenzie, Alaska
  11. 1.6 25 km ENE of Point Possession, Alaska
  12. 2.1 21 km NNE of Sterling, Alaska
  13. 1.6 17 km SW of Susitna, Alaska
  14. 2.4 5 km WNW of Point MacKenzie, Alaska
  15. 1.6 5 km E of Anchorage, 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 7.1 on 2018-11-30 — it released about 89,000,000 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.