Earthquake near Susitna North, 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 5 km (3 mi) from the epicentre. In Susitna North, 18 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.

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 4.6 on 2020-11-26 — about 45,000 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

1. 5.9 23 km NE of Willow, Alaska · 38 km SSW of this epicentre Jan 1, 1975
2. 5.8 37 km ENE of Susitna North, Alaska · 19 km ENE of this epicentre Jul 3, 1929
3. 5.8 14 km NNE of Fishhook, Alaska · 48 km SSE of this epicentre Aug 14, 1984
4. 5.4 25 km NNW of Willow, Alaska · 43 km SW of this epicentre May 10, 1962
5. 5.1 21 km SSE of Susitna North, Alaska · 29 km SSW 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 62.2378, -149.5407. 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 43 km ENE of Susitna North, Alaska 17:50 UTC
2. 1.9 43 km ENE of Susitna North, Alaska 17:50 UTC
3. 1.9 12 km ESE of Susitna North, Alaska 16:52 UTC
4. 1.9 53 km E of Chase, Alaska 16:10 UTC
5. 1.9 44 km ENE of Susitna North, Alaska 22:31 UTC
6. 1.6 43 km ENE of Susitna North, Alaska 11:33 UTC
7. 2.1 43 km ENE of Susitna North, Alaska 09:45 UTC
8. 1.6 43 km ENE of Susitna North, Alaska 07:12 UTC
9. 1.7 42 km ENE of Susitna North, Alaska 06:30 UTC
10. 1.5 43 km ENE of Susitna North, Alaska 03:18 UTC
11. 1.6 42 km ENE of Susitna North, Alaska 23:57 UTC
12. 3.3 43 km ENE of Susitna North, Alaska 04:00 UTC
13. 1.5 12 km NNE of Willow, Alaska 18:03 UTC
14. 2.1 46 km E of Chase, Alaska 22:09 UTC
15. 1.5 24 km E of Susitna North, Alaska 18:30 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:13 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.