42 km S of Ivanof Bay, 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 5.7 on 2020-07-22 — about 1,400,000 times the energy of this one.

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

1. 6.2 64 km SSE of Perryville, Alaska · 47 km ESE of this epicentre Jul 28, 1927
2. 6.0 54 km E of Sand Point, Alaska · 27 km SSW of this epicentre Oct 3, 1916
3. 5.8 43 km SSE of Perryville, Alaska · 30 km E of this epicentre Nov 2, 1930
4. 5.1 65 km E of Sand Point, Alaska · 32 km S of this epicentre Dec 26, 1976

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 55.5230, -159.4258. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.2 53 km E of Sand Point, Alaska 08:48 UTC
2. 1.8 52 km E of Sand Point, Alaska 14:33 UTC
3. 2.3 49 km E of Sand Point, Alaska 20:59 UTC
4. 2.4 66 km S of Perryville, Alaska 06:10 UTC
5. 2.4 61 km SSE of Ivanof Bay, Alaska 18:58 UTC
6. 2.4 21 km SE of Perryville, Alaska 04:58 UTC
7. 2.6 61 km S of Ivanof Bay, Alaska 01:08 UTC
8. 2.2 4 km ENE of Ivanof Bay, Alaska 09:03 UTC
9. 2.6 77 km ESE of Sand Point, Alaska 05:29 UTC
10. 2.2 58 km S of Ivanof Bay, Alaska 03:42 UTC
11. 1.9 38 km S of Ivanof Bay, Alaska 14:59 UTC
12. 2.4 33 km S of Perryville, Alaska 12:34 UTC
13. 2.0 45 km SSE of Ivanof Bay, Alaska 12:28 UTC
14. 2.3 36 km SW of Ivanof Bay, Alaska 08:40 UTC
15. 2.2 62 km ESE of Sand Point, Alaska 01:58 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:47 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.