146 km S of False Pass, Alaska

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
3. Around the size people start to feel M 3.0 2.8× the energy of this one
4. This earthquake M 2.7 about 340 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.

Where

Epicentre 53.5453, -163.1819. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.2 151 km S of False Pass, Alaska 15:29 UTC
2. 2.3 134 km S of False Pass, Alaska 10:58 UTC
3. 2.9 156 km S of False Pass, Alaska 00:17 UTC
4. 2.7 150 km SSE of False Pass, Alaska 13:39 UTC
5. 2.8 138 km S of False Pass, Alaska 11:54 UTC
6. 2.6 154 km S of False Pass, Alaska 02:36 UTC
7. 2.9 144 km SSE of False Pass, Alaska 11:14 UTC
8. 3.4 157 km S of False Pass, Alaska 08:23 UTC
9. 3.2 153 km S of False Pass, Alaska 18:01 UTC
10. 4.9 135 km S of False Pass, Alaska 08:36 UTC
11. 2.6 Unimak Island region, Alaska 05:08 UTC
12. 3.4 131 km S of False Pass, Alaska 01:53 UTC
13. 2.5 126 km S of False Pass, Alaska 00:17 UTC
14. 3.3 150 km S of False Pass, Alaska 23:59 UTC
15. 2.5 150 km S of False Pass, Alaska 23:52 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 10:44 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 5.9 on 2016-10-27 — it released about 63,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.