49 km NNW of Gustavus, Alaska

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 12 km (7 mi) from the epicentre. 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
3. Around the size people start to feel M 3.0 63× the energy of this one
4. This earthquake M 1.8 about 15 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 5.3 on 2023-10-28 — about 180,000 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

1. 6.1 77 km SW of Covenant Life, Alaska · 45 km WNW of this epicentre Mar 9, 1952
2. 5.9 41 km SSW of Covenant Life, Alaska · 37 km NNW of this epicentre Sep 15, 1985
3. 5.2 63 km SW of Covenant Life, Alaska · 37 km NW of this epicentre Jun 4, 2014
4. 5.0 66 km NNW of Elfin Cove, Alaska · 27 km W of this epicentre Jun 7, 2009

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 58.7892, -136.1901. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.0 35 km SW of Covenant Life, Alaska 06:49 UTC
2. 3.1 48 km SSW of Covenant Life, Alaska 16:14 UTC
3. 2.8 48 km SSW of Covenant Life, Alaska 15:02 UTC
4. 3.0 32 km SSW of Covenant Life, Alaska 12:23 UTC
5. 2.3 50 km NNW of Elfin Cove, Alaska 21:59 UTC
6. 2.9 40 km WSW of Haines, Alaska 10:30 UTC
7. 2.9 73 km SSW of Covenant Life, Alaska 23:18 UTC
8. 1.8 59 km SSW of Covenant Life, Alaska 13:36 UTC
9. 1.8 52 km NNW of Elfin Cove, Alaska 03:40 UTC
10. 1.7 73 km NW of Gustavus, Alaska 13:50 UTC
11. 1.5 59 km SW of Covenant Life, Alaska 12:09 UTC
12. 2.8 40 km SW of Covenant Life, Alaska 03:42 UTC
13. 1.6 44 km SSW of Covenant Life, Alaska 07:01 UTC
14. 1.8 39 km NW of Elfin Cove, Alaska 01:23 UTC
15. 1.7 35 km SSW of Covenant Life, Alaska 12:33 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 19:18 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.