57 km SE of Adak, 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 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 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 6.3 on 2019-11-24 — about 11,000,000 times the energy of this one.

Before 2016, the USGS record lists 137 earthquakes of M5 or more within 50 km; the five largest:

1. 8.6 1957 Atka, Alaska Earthquake · 26 km E of this epicentre Mar 9, 1957
2. 6.9 100 km ESE of Adak, Alaska · 49 km E of this epicentre Oct 13, 1926
3. 6.7 76 km SSE of Adak, Alaska · 34 km SSW of this epicentre Dec 10, 1905
4. 6.7 52 km ESE of Adak, Alaska · 14 km NNE of this epicentre Nov 4, 1977
5. 6.5 56 km E of Adak, Alaska · 40 km NNE of this epicentre Jul 17, 1914

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 51.5329, -176.0009. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.5 59 km SSE of Adak, Alaska 14:02 UTC
2. 1.5 33 km SSE of Adak, Alaska 11:22 UTC
3. 3.2 42 km SSE of Adak, Alaska 15:57 UTC
4. 1.6 35 km SSE of Adak, Alaska 08:26 UTC
5. 2.2 79 km SE of Adak, Alaska 06:23 UTC
6. 2.6 Andreanof Islands, Aleutian Islands, Alaska 23:14 UTC
7. 1.7 60 km SE of Adak, Alaska 02:17 UTC
8. 3.6 63 km SE of Adak, Alaska 18:34 UTC
9. 2.0 42 km SSE of Adak, Alaska 23:05 UTC
10. 3.5 57 km ESE of Adak, Alaska 02:48 UTC
11. 1.6 24 km SE of Adak, Alaska 13:29 UTC
12. 2.6 59 km SSE of Adak, Alaska 23:33 UTC
13. 1.6 60 km SE of Adak, Alaska 16:27 UTC
14. 1.8 62 km E of Adak, Alaska 03:18 UTC
15. 1.8 62 km SSE of Adak, Alaska 09:28 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 05:54 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.