49 km W of Tatitlek, Alaska

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 9 km (6 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 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 5.3 on 2017-11-27 — about 16,000 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

1. 9.2 The 1964 Prince William Sound, Alaska Earthquake · 15 km ENE of this epicentre Mar 28, 1964
2. 6.7 Prince William Sound, Alaska · 36 km SE of this epicentre Jan 31, 1912
3. 6.6 57 km ENE of Whittier, Alaska · 21 km NNW of this epicentre Feb 23, 1925
4. 6.6 37 km WNW of Tatitlek, Alaska · 25 km NE of this epicentre Jul 12, 1983
5. 6.4 Prince William Sound, Alaska · 49 km SSE of this epicentre Feb 15, 1916

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 60.8620, -147.5940. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.7 25 km WNW of Tatitlek, Alaska 02:55 UTC
2. 2.0 52 km E of Whittier, Alaska 12:54 UTC
3. 0.9 64 km S of Glacier View, Alaska 10:30 UTC
4. 1.0 66 km WNW of Tatitlek, Alaska 04:24 UTC
5. 1.4 30 km WSW of Tatitlek, Alaska 20:01 UTC
6. 1.5 50 km WNW of Tatitlek, Alaska 16:14 UTC
7. 2.0 44 km WNW of Valdez, Alaska 20:31 UTC
8. 1.5 47 km WNW of Tatitlek, Alaska 13:17 UTC
9. 1.6 63 km S of Glacier View, Alaska 04:55 UTC
10. 1.8 46 km NW of Tatitlek, Alaska 04:23 UTC
11. 1.6 42 km WSW of Tatitlek, Alaska 05:55 UTC
12. 1.3 44 km E of Whittier, Alaska 04:17 UTC
13. 1.2 61 km S of Glacier View, Alaska 07:06 UTC
14. 1.3 64 km NW of Tatitlek, Alaska 19:18 UTC
15. 1.2 48 km NW of Tatitlek, Alaska 19:03 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 04:19 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

Revisions

USGS refines a solution as more stations report. Every change we have seen is listed here.

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.