193 km S of Sand Point, Alaska

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 3.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 45,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
4. This earthquake M 3.6 about 3.8 tons of TNT
5. Around the size people start to feel M 3.0 this one released 7.9× 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 53.6188, -160.0353. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.8 233 km S of Sand Point, Alaska 13:15 UTC
2. 2.7 228 km S of Sand Point, Alaska 13:03 UTC
3. 2.7 158 km SSE of Sand Point, Alaska 06:06 UTC
4. 2.3 206 km SSE of Sand Point, Alaska 16:21 UTC
5. 3.2 231 km S of Sand Point, Alaska 03:19 UTC
6. 2.2 148 km SSE of Sand Point, Alaska 13:59 UTC
7. 2.5 196 km SSE of Sand Point, Alaska 00:02 UTC
8. 2.3 206 km S of Sand Point, Alaska 21:31 UTC
9. 2.9 214 km SSE of Sand Point, Alaska 14:45 UTC
10. 2.6 218 km S of Sand Point, Alaska 04:57 UTC
11. 3.2 220 km S of Sand Point, Alaska 15:47 UTC
12. 2.8 223 km S of Sand Point, Alaska 02:19 UTC
13. 2.6 226 km S of Sand Point, Alaska 08:59 UTC
14. 2.4 226 km S of Sand Point, Alaska 11:12 UTC
15. 2.8 239 km S of Sand Point, Alaska 03:58 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 5.5 on 2020-07-05 — it released about 710 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.