28 km E of Perryville, 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 5 km (3 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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
3. Around the size people start to feel M 3.0 130× the energy of this one
4. This earthquake M 1.6 about 7.6 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 5.1 on 2016-08-27 — 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. 5.8 43 km SSE of Perryville, Alaska · 39 km SSW of this epicentre Nov 2, 1930
2. 5.8 46 km S of Chignik, Alaska · 23 km E of this epicentre Feb 21, 1972
3. 5.5 51 km SSE of Chignik, Alaska · 30 km E of this epicentre Feb 24, 1972
4. 5.1 34 km S of Chignik, Alaska · 21 km NE of this epicentre Sep 5, 1994

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 55.8643, -158.6983. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.7 24 km ESE of Perryville, Alaska 21:33 UTC
2. 2.5 27 km SE of Perryville, Alaska 08:59 UTC
3. 1.9 38 km SSE of Chignik, Alaska 07:59 UTC
4. 2.6 31 km SSE of Perryville, Alaska 06:24 UTC
5. 2.3 50 km ESE of Perryville, Alaska 20:27 UTC
6. 2.0 23 km E of Perryville, Alaska 17:50 UTC
7. 2.1 32 km SSE of Perryville, Alaska 08:18 UTC
8. 2.3 60 km SE of Perryville, Alaska 23:21 UTC
9. 2.5 3 km SSW of Perryville, Alaska 13:00 UTC
10. 2.0 27 km SSE of Perryville, Alaska 17:51 UTC
11. 2.1 10 km NNW of Perryville, Alaska 09:38 UTC
12. 1.9 16 km SE of Chignik, Alaska 21:44 UTC
13. 2.3 33 km E of Perryville, Alaska 15:27 UTC
14. 2.3 54 km SE of Perryville, Alaska 13:09 UTC
15. 1.7 37 km SSE of Perryville, Alaska 21:43 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:12 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.