Earthquake near Eagle River, AK

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 6 km (4 mi) from the epicentre. In Eagle River, 7 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.

Earthquakes near other towns within 30 km: Elmendorf Air Force Base, Anchorage, Knik-Fairview.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
3. Around the size people start to feel M 3.0 11× the energy of this one
4. This earthquake M 2.3 about 85 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.

For this area

The largest earthquake within 50 km since 2016 was M 7.1 on 2018-11-30 — about 16,000,000 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

1. 5.6 11 km NW of Big Lake, Alaska · 48 km NW of this epicentre Oct 7, 1966
2. 5.5 2 km ENE of Eagle River, Alaska · 6 km NNW of this epicentre May 11, 1965
3. 5.5 26 km SSW of Anchorage, Alaska · 46 km SW of this epicentre May 24, 1995
4. 5.3 3 km NNE of Houston, Alaska · 46 km NNW of this epicentre Sep 1, 1966
5. 5.3 8 km NW of Knik-Fairview, Alaska · 34 km NNW of this epicentre May 6, 1997

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 61.2770, -149.4738. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.6 5 km NE of Sunrise, Alaska 08:28 UTC
2. 1.6 8 km N of Meadow Lakes, Alaska 15:09 UTC
3. 2.9 5 km E of Big Lake, Alaska 19:45 UTC
4. 1.5 9 km NNW of Big Lake, Alaska 07:47 UTC
5. 3.4 15 km ESE of Eagle River, Alaska 05:35 UTC
6. 1.8 14 km ESE of Eagle River, Alaska 23:57 UTC
7. 2.7 Southern Alaska 01:48 UTC
8. 1.7 3 km ESE of Big Lake, Alaska 08:36 UTC
9. 2.5 7 km NW of Hope, Alaska 11:43 UTC
10. 1.8 4 km SSE of Big Lake, Alaska 19:43 UTC
11. 1.5 20 km ESE of Elmendorf Air Force Base, Alaska 06:34 UTC
12. 1.6 3 km E of Big Lake, Alaska 16:33 UTC
13. 4.5 3 km SSW of Eagle River, Alaska 14:47 UTC
14. 2.9 5 km NNW of Houston, Alaska 07:54 UTC
15. 2.0 4 km NW of Houston, Alaska 06:59 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 11:04 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

• The official USGS event page — the source of record for every value above
• Did you feel it? Report it to USGS — reports go to USGS, not to us
• ShakeMap for this event, when USGS has produced one

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