Earthquake near Eagle River, AK

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 17 km (11 mi) from the epicentre. In Eagle River, 16 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: Eagle River 16 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
3. Around the size people start to feel M 3.0 5.6× the energy of this one
4. This earthquake M 2.5 about 170 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 4.5 on 2023-07-03 — about 1,000 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

1. 6.0 21 km N of Whittier, Alaska · 49 km SE of this epicentre Sep 14, 1932
2. 5.5 2 km ENE of Eagle River, Alaska · 14 km W of this epicentre May 11, 1965
3. 5.3 3 km NNE of Houston, Alaska · 47 km NW of this epicentre Sep 1, 1966
4. 5.3 8 km NW of Knik-Fairview, Alaska · 37 km NW of this epicentre May 6, 1997
5. 5.3 13 km ESE of Eagle River, Alaska · 4 km SW of this epicentre Jul 22, 1999

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 61.3124, -149.2595. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.4 5 km ENE of Houston, Alaska 17:28 UTC
2. 2.8 12 km SSE of Elmendorf Air Force Base, Alaska 18:13 UTC
3. 1.7 16 km ESE of Eagle River, Alaska 16:31 UTC
4. 3.2 4 km NNW of Meadow Lakes, Alaska 13:23 UTC
5. 2.1 4 km ESE of Knik, Alaska 14:26 UTC
6. 2.5 7 km NNE of Meadow Lakes, Alaska 02:26 UTC
7. 2.7 7 km NNE of Meadow Lakes, Alaska 02:26 UTC
8. 1.7 13 km SE of Knik-Fairview, Alaska 13:26 UTC
9. 2.3 8 km NNW of Tanaina, Alaska 22:25 UTC
10. 1.9 6 km NNE of Eagle River, Alaska 17:39 UTC
11. 3.2 7 km NNW of Meadow Lakes, Alaska 15:44 UTC
12. 2.3 7 km SW of Meadow Lakes, Alaska 08:53 UTC
13. 1.5 5 km NNW of Tanaina, Alaska 08:30 UTC
14. 1.9 4 km WSW of Girdwood, Alaska 02:13 UTC
15. 1.8 5 km SSW of Meadow Lakes, Alaska 21:23 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:58 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.