214 km SSE of Sand Point, Alaska

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 480 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 350× the energy of this one
2. Mineral, Virginia 2011 M 5.8 16× the energy of this one
3. Magna, Utah 2020 M 5.7 11× the energy of this one
4. This earthquake M 5.0 about 480 tons of TNT
5. Around the size people start to feel M 3.0 this one released 1,000× 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 53.4722, -159.6363. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.4 171 km SSE of Sand Point, Alaska 19:46 UTC
2. 3.2 210 km SSE of Sand Point, Alaska 18:16 UTC
3. 2.6 175 km SSE of Sand Point, Alaska 16:48 UTC
4. 2.4 184 km SSE of Sand Point, Alaska 00:59 UTC
5. 2.8 196 km SSE of Sand Point, Alaska 01:03 UTC
6. 3.1 215 km S of Sand Point, Alaska 03:04 UTC
7. 3.4 215 km S of Sand Point, Alaska 10:35 UTC
8. 2.0 193 km S of Sand Point, Alaska 07:41 UTC
9. 2.1 192 km S of Sand Point, Alaska 20:03 UTC
10. 2.1 178 km S of Sand Point, Alaska 15:56 UTC
11. 3.3 191 km S of Sand Point, Alaska 08:07 UTC
12. 2.7 203 km S of Sand Point, Alaska 16:37 UTC
13. 2.9 210 km S of Sand Point, Alaska 16:06 UTC
14. 4.2 200 km S of Sand Point, Alaska 15:59 UTC
15. 2.1 187 km S of Sand Point, Alaska 10:36 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:28 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 5.3 on 2020-12-16 — it released about 2.8 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.