219 km SE of Nikolski, Alaska

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
3. Around the size people start to feel M 3.0 11× the energy of this one
4. This earthquake M 2.3 about 85 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 51.6106, -166.4782. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.4 204 km SE of Nikolski, Alaska 00:41 UTC
2. 2.5 224 km SE of Nikolski, Alaska 16:33 UTC
3. 2.6 196 km SE of Nikolski, Alaska 07:04 UTC
4. 2.6 231 km SE of Nikolski, Alaska 14:44 UTC
5. 2.5 187 km SE of Nikolski, Alaska 20:58 UTC
6. 2.8 199 km SE of Nikolski, Alaska 02:44 UTC
7. 2.6 203 km ESE of Nikolski, Alaska 07:44 UTC
8. 4.2 213 km S of Unalaska, Alaska 11:55 UTC
9. 2.7 198 km SE of Nikolski, Alaska 11:13 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:11 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.