Earthquake near Sutton-Alpine, AK

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Sutton-Alpine, 4 km away, the estimate is intensity I (not felt). 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: Lazy Mountain, Farm Loop, Fishhook, Palmer, Butte, Gateway.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
3. Around the size people start to feel M 3.0 180× the energy of this one
4. This earthquake M 1.5 about 5.4 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 4.1 on 2016-08-02 — about 7,900 times the energy of this one.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

1. 5.9 23 km NE of Willow, Alaska · 48 km WNW of this epicentre Jan 1, 1975
2. 5.8 14 km NNE of Fishhook, Alaska · 16 km NW of this epicentre Aug 14, 1984
3. 5.3 3 km NNE of Houston, Alaska · 47 km WSW of this epicentre Sep 1, 1966
4. 5.3 8 km NW of Knik-Fairview, Alaska · 48 km WSW of this epicentre May 6, 1997
5. 5.1 21 km SSE of Susitna North, Alaska · 49 km WNW of this epicentre Dec 30, 1974

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 61.7481, -148.8993. Map © OpenStreetMap contributors.

Nearby places

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 3 km N of Buffalo Soapstone, Alaska 03:50 UTC
2. 1.7 13 km N of Fishhook, Alaska 12:45 UTC
3. 2.7 32 km NNW of Chickaloon, Alaska 05:49 UTC
4. 1.8 19 km NNE of Fishhook, Alaska 12:44 UTC
5. 1.6 34 km N of Sutton-Alpine, Alaska 08:28 UTC
6. 1.7 16 km NNW of Fishhook, Alaska 22:10 UTC
7. 1.6 31 km N of Sutton-Alpine, Alaska 19:16 UTC
8. 1.6 30 km ESE of Susitna North, Alaska 13:40 UTC
9. 1.5 17 km NNW of Fishhook, Alaska 03:44 UTC
10. 2.1 9 km SSE of Gateway, Alaska 05:01 UTC
11. 1.6 30 km ESE of Susitna North, Alaska 04:43 UTC
12. 2.2 36 km E of Susitna North, Alaska 08:06 UTC
13. 1.7 30 km N of Fishhook, Alaska 08:55 UTC
14. 1.5 16 km N of Chickaloon, Alaska 09:14 UTC
15. 2.4 14 km S of Knik River, Alaska 08:02 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:29 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.