80 km W of Adak, AK

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 8 km (5 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 6.8 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 2,200,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
3. Around the size people start to feel M 3.0 140× the energy of this one
4. This earthquake M 1.6 about 6.8 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 in our catalogue was M 6.2 on 2020-01-23 — about 8,800,000 times the energy of this one.

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 51.8550, -177.7923. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.8 87 km W of Adak, Alaska 17:01 UTC
2. 4.0 51 km WSW of Adak, Alaska 09:26 UTC
3. 1.7 88 km W of Adak, Alaska 17:59 UTC
4. 1.6 80 km W of Adak, Alaska 14:18 UTC
5. 1.8 89 km W of Adak, Alaska 07:58 UTC
6. 3.6 88 km W of Adak, Alaska 07:40 UTC
7. 1.6 107 km WSW of Adak, Alaska 04:55 UTC
8. 1.6 62 km SW of Adak, Alaska 13:47 UTC
9. 1.9 83 km W of Adak, Alaska 18:09 UTC
10. 1.7 80 km W of Adak, Alaska 08:42 UTC
11. 1.6 78 km W of Adak, Alaska 08:20 UTC
12. 1.7 77 km W of Adak, Alaska 23:58 UTC
13. 2.2 84 km W of Adak, Alaska 21:06 UTC
14. 1.6 Andreanof Islands, Aleutian Islands, Alaska 17:39 UTC
15. 1.7 89 km WSW of Adak, Alaska 08:35 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 05:59 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.