48 km SW of Nikolski, 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 7 km (4 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 5.5 on 2017-08-09 — about 710,000 times the energy of this one.

Before 2016, the USGS record lists 66 earthquakes of M5 or more within 50 km; the five largest:

1. 7.1 35 km SW of Nikolski, Alaska · 17 km E of this epicentre Mar 11, 1957
2. 6.9 77 km SSW of Nikolski, Alaska · 38 km S of this epicentre Jan 23, 1935
3. 6.9 80 km SW of Nikolski, Alaska · 37 km S of this epicentre Mar 9, 1957
4. 6.9 Fox Islands, Aleutian Islands, Alaska · 34 km S of this epicentre Jul 27, 2015
5. 6.8 46 km SSW of Nikolski, Alaska · 17 km SE of this epicentre Jul 22, 1933

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 52.6797, -169.4435. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.4 52 km WSW of Nikolski, Alaska 18:20 UTC
2. 2.4 55 km WSW of Nikolski, Alaska 17:15 UTC
3. 2.5 86 km SW of Nikolski, Alaska 10:52 UTC
4. 2.8 28 km SSW of Nikolski, Alaska 08:41 UTC
5. 3.4 82 km SW of Nikolski, Alaska 20:02 UTC
6. 3.6 80 km SSW of Nikolski, Alaska 05:51 UTC
7. 3.8 74 km SSW of Nikolski, Alaska 08:24 UTC
8. 2.2 60 km SSW of Nikolski, Alaska 01:51 UTC
9. 2.4 Fox Islands, Aleutian Islands, Alaska 19:58 UTC
10. 3.5 82 km SW of Nikolski, Alaska 12:00 UTC
11. 3.3 69 km SSW of Nikolski, Alaska 05:35 UTC
12. 2.4 57 km SSW of Nikolski, Alaska 01:21 UTC
13. 3.1 65 km SSW of Nikolski, Alaska 13:14 UTC
14. 2.2 44 km WSW of Nikolski, Alaska 23:23 UTC
15. 2.2 45 km WSW of Nikolski, Alaska 15:33 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:54 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.