QuakeIndex

Earthquake · reviewed by a seismologist

M 4.6mb

Earthquake near Anchor Point, AK

No earthquake was likely felt in Anchor Point in the 24 hours to 3:58 pm AKST (00:58 UTC). The last one was M 4.3, 69 km (43 mi) NE, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Anchor Point

This page: a magnitude 4.6 earthquake was recorded 42 km (26 mi) west-northwest of Anchor Point, AK, at 8:00 am AKST on 28 February 2022 (17:00 UTC), 100 km deep. 4 people have reported feeling it to USGS.

USGS: 41 km W of Happy Valley, Alaska

8:00 am AKST, Feb 28, 2022 · · 100 km deep · released about 120 tons of TNT

Every earthquake near Anchor Point Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kenai Peninsula Borough 43 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
8:00 am AKST on 28 February 2022 ()
Where
42 km (26 mi) west-northwest of Anchor Point, AK · earthquakes near Anchor Point
Magnitude
M 4.6 (mb)
Depth
100 km below the surface
Felt
4 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Kenai Peninsula Borough, 43 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1651 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 111 km (69 mi) from the epicentre. In Anchor Point, 42 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Anchor Point 42 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 120 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 1,400× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 63× the energy of this one
  3. Magna, Utah 2020 M 5.7 45× the energy of this one
  4. This earthquake M 4.6 about 120 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 250× more

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.

For this area

The largest earthquake within 50 km since 2016 was M 5.6 on 2017-03-02 — about 32 times the energy of this one.

Before 2016, the USGS record lists 22 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 75 km WNW of Ninilchik, Alaska · 43 km NW of this epicentre
  2. 6.4 52 km ENE of Pedro Bay, Alaska · 42 km WSW of this epicentre
  3. 6.2 16 km WNW of Happy Valley, Alaska · 26 km E of this epicentre
  4. 6.2 70 km E of Port Alsworth, Alaska · 37 km WNW of this epicentre
  5. 6.1 73 km WNW of Ninilchik, Alaska · 48 km NNW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 59.9857, -152.4677. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 43 km (27 mi) N 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. 1.7 65 km WNW of Happy Valley, Alaska
  2. 1.6 38 km WSW of Anchor Point, Alaska
  3. 1.9 58 km W of Anchor Point, Alaska
  4. 1.5 56 km W of Happy Valley, Alaska
  5. 2.2 55 km WNW of Ninilchik, Alaska
  6. 1.5 66 km WNW of Anchor Point, Alaska
  7. 1.5 64 km W of Happy Valley, Alaska
  8. 1.9 28 km WNW of Ninilchik, Alaska
  9. 2.2 45 km WNW of Happy Valley, Alaska
  10. 1.7 61 km E of Pedro Bay, Alaska
  11. 2.2 Southern Alaska
  12. 1.7 33 km NW of Ninilchik, Alaska
  13. 1.7 46 km WNW of Ninilchik, Alaska
  14. 1.6 53 km W of Happy Valley, Alaska
  15. 1.5 64 km ENE of Pedro Bay, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.