136 km ESE 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 52.4224, -167.0269. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 4.3 121 km S of Unalaska, Alaska 07:04 UTC
2. 3.6 126 km S of Unalaska, Alaska 07:00 UTC
3. 2.3 159 km ESE of Nikolski, Alaska 13:14 UTC
4. 2.5 146 km ESE of Nikolski, Alaska 00:12 UTC
5. 2.4 140 km SE of Nikolski, Alaska 15:35 UTC
6. 3.9 135 km ESE of Nikolski, Alaska 23:14 UTC
7. 3.8 141 km ESE of Nikolski, Alaska 22:14 UTC
8. 3.0 141 km ESE of Nikolski, Alaska 10:42 UTC
9. 2.0 134 km ESE of Nikolski, Alaska 17:57 UTC
10. 2.0 142 km ESE of Nikolski, Alaska 15:57 UTC
11. 2.3 139 km ESE of Nikolski, Alaska 04:38 UTC
12. 3.6 135 km ESE of Nikolski, Alaska 23:38 UTC
13. 2.8 135 km ESE of Nikolski, Alaska 23:21 UTC
14. 2.6 134 km ESE of Nikolski, Alaska 16:52 UTC
15. 2.1 115 km ESE of Nikolski, Alaska 14:22 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 17:17 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 2017-05-24 — it released about 63 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.