QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

20 km E of Point Possession, Alaska

· 47 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Anchorage Municipality 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
47 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 61 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 947 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 60.9463, -150.3149. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 61 km (38 mi) WSW of here earthquakes near Anchorage Municipality
Kenai Peninsula Borough, AK 127 km (79 mi) ENE 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

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

  1. 1.7 10 km SW of Point Possession, Alaska
  2. 2.3 10 km SSW of Point MacKenzie, Alaska
  3. 1.5 12 km W of Point MacKenzie, Alaska
  4. 2.1 5 km WNW of Point MacKenzie, Alaska
  5. 1.7 12 km NW of Point Possession, Alaska
  6. 1.5 18 km SSW of Point Possession, Alaska
  7. 1.5 21 km SSW of Susitna, Alaska
  8. 1.6 18 km N of Point Possession, Alaska
  9. 2.1 10 km SW of Point MacKenzie, Alaska
  10. 2.5 14 km W of Point MacKenzie, Alaska
  11. 1.5 21 km ESE of Point Possession, Alaska
  12. 1.7 18 km WSW of Hope, Alaska
  13. 1.8 27 km SSW of Susitna, Alaska
  14. 1.7 24 km N of Cooper Landing, Alaska
  15. 1.6 7 km WSW of Point Possession, 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.