105 km WNW of Nikolski, Alaska

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 170 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.7 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 1,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 45× the energy of this one
3. Magna, Utah 2020 M 5.7 32× the energy of this one
4. This earthquake M 4.7 about 170 tons of TNT
5. Around the size people start to feel M 3.0 this one released 350× more

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 53.1544, -170.3891. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.9 71 km WSW of Nikolski, Alaska 20:37 UTC
2. 2.2 96 km WSW of Nikolski, Alaska 23:59 UTC
3. 3.6 130 km WNW of Nikolski, Alaska 05:20 UTC
4. 3.1 85 km WNW of Nikolski, Alaska 20:54 UTC
5. 4.0 107 km W of Nikolski, Alaska 06:30 UTC
6. 2.7 114 km WNW of Nikolski, Alaska 04:23 UTC
7. 2.9 98 km WNW of Nikolski, Alaska 09:04 UTC
8. 3.2 Fox Islands, Aleutian Islands, Alaska 18:24 UTC
9. 3.1 131 km WNW of Nikolski, Alaska 04:17 UTC
10. 3.8 122 km NW of Nikolski, Alaska 18:32 UTC
11. 2.9 131 km W of Nikolski, Alaska 13:14 UTC
12. 3.2 108 km WNW of Nikolski, Alaska 22:09 UTC
13. 3.2 110 km WNW of Nikolski, Alaska 19:39 UTC
14. 3.0 Fox Islands, Aleutian Islands, Alaska 16:19 UTC
15. 2.4 103 km WNW of Nikolski, Alaska 06:59 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 16:04 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 5.2 on 2017-01-09 — it released about 5.6 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.