93 km NNW of Aleneva, 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 4 km (2 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 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 5.6 on 2017-08-31 — about 1,400,000 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

1. 6.0 61 km WSW of Nanwalek, Alaska · 44 km NE of this epicentre Dec 5, 1942
2. 5.8 63 km WSW of Nanwalek, Alaska · 41 km NE of this epicentre May 19, 2000
3. 5.6 62 km SE of Kokhanok, Alaska · 42 km WNW of this epicentre Mar 23, 1984
4. 5.5 73 km WSW of Nanwalek, Alaska · 31 km ENE of this epicentre Dec 30, 1938
5. 5.5 73 km SSE of Kokhanok, Alaska · 41 km W of this epicentre May 21, 1964

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 58.8507, -153.4627. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.5 52 km SE of Pope-Vannoy Landing, Alaska 14:35 UTC
2. 1.9 56 km SE of Pope-Vannoy Landing, Alaska 00:09 UTC
3. 2.9 67 km WSW of Nanwalek, Alaska 03:45 UTC
4. 2.0 84 km SE of Pope-Vannoy Landing, Alaska 02:37 UTC
5. 1.7 64 km SE of Pope-Vannoy Landing, Alaska 14:30 UTC
6. 1.8 59 km SE of Pope-Vannoy Landing, Alaska 00:48 UTC
7. 1.9 64 km SE of Pope-Vannoy Landing, Alaska 14:29 UTC
8. 1.9 93 km SW of Nanwalek, Alaska 15:53 UTC
9. 1.6 89 km SE of Kokhanok, Alaska 08:38 UTC
10. 1.7 58 km SE of Pope-Vannoy Landing, Alaska 00:34 UTC
11. 1.7 88 km SW of Nanwalek, Alaska 10:17 UTC
12. 2.2 74 km WSW of Nanwalek, Alaska 17:24 UTC
13. 2.0 54 km SE of Pope-Vannoy Landing, Alaska 12:21 UTC
14. 1.7 86 km NNW of Aleneva, Alaska 03:43 UTC
15. 3.3 73 km SE of Pope-Vannoy Landing, Alaska 11:59 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 19:13 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.