130 km SE of Akutan, 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 12 km (7 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 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
2. Magna, Utah 2020 M 5.7 350,000× the energy of this one
3. Around the size people start to feel M 3.0 32× the energy of this one
4. This earthquake M 2.0 about 30 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 2017-05-24 — about 45,000 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

1. 6.2 136 km SE of Akutan, Alaska · 49 km NE of this epicentre Apr 1, 1946
2. 6.2 156 km SE of Akutan, Alaska · 41 km E of this epicentre Nov 12, 1946
3. 5.4 112 km SE of Akutan, Alaska · 31 km NNE of this epicentre Apr 4, 1993
4. 5.4 149 km SE of Akutan, Alaska · 22 km ESE of this epicentre Dec 1, 1998
5. 5.2 121 km SE of Akutan, Alaska · 25 km NNE of this epicentre Dec 28, 2005

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 53.1736, -164.6434. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.6 Unimak Island region, Alaska 19:51 UTC
2. 2.0 102 km SE of Akutan, Alaska 18:26 UTC
3. 2.0 107 km SE of Akutan, Alaska 00:51 UTC
4. 2.0 148 km SE of Akutan, Alaska 00:45 UTC
5. 2.8 95 km SE of Akutan, Alaska 16:25 UTC
6. 2.7 129 km SE of Akutan, Alaska 05:43 UTC
7. 2.6 122 km SE of Akutan, Alaska 21:48 UTC
8. 2.7 98 km SE of Akutan, Alaska 10:46 UTC
9. 2.7 94 km SE of Akutan, Alaska 10:35 UTC
10. 2.8 111 km SE of Akutan, Alaska 01:25 UTC
11. 2.7 111 km SE of Akutan, Alaska 21:43 UTC
12. 3.7 106 km SE of Akutan, Alaska 16:21 UTC
13. 3.3 135 km SSE of Akutan, Alaska 23:19 UTC
14. 2.8 146 km SE of Akutan, Alaska 07:42 UTC
15. 2.8 93 km SE of Akutan, Alaska 22:28 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:43 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.