225 km SE 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 43 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 4,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 180× the energy of this one
3. Magna, Utah 2020 M 5.7 130× the energy of this one
4. This earthquake M 4.3 about 43 tons of TNT
5. Around the size people start to feel M 3.0 this one released 89× 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 51.2800, -166.9771. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.4 192 km SE of Nikolski, Alaska 14:30 UTC
2. 2.6 231 km SE of Nikolski, Alaska 14:44 UTC
3. 2.6 192 km SE of Nikolski, Alaska 11:08 UTC
4. 2.3 190 km SSE of Nikolski, Alaska 09:41 UTC
5. 2.4 214 km SE of Nikolski, Alaska 01:37 UTC
6. 3.1 227 km SE of Nikolski, Alaska 08:02 UTC
7. 2.4 224 km SE of Nikolski, Alaska 19:33 UTC
8. 5.2 179 km SE of Nikolski, Alaska 01:48 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:40 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.