209 km SSE of False Pass, 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 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 22,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
3. Magna, Utah 2020 M 5.7 710× the energy of this one
4. This earthquake M 3.8 about 7.6 tons of TNT
5. Around the size people start to feel M 3.0 this one released 16× 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 53.0909, -162.3137. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.6 206 km SSE of False Pass, Alaska 23:48 UTC
2. 2.2 228 km SSE of False Pass, Alaska 20:37 UTC
3. 2.6 244 km SSE of False Pass, Alaska 19:41 UTC
4. 2.5 240 km SSE of False Pass, Alaska 15:31 UTC
5. 2.6 231 km SSE of False Pass, Alaska 11:38 UTC
6. 2.6 207 km S of King Cove, Alaska 16:20 UTC
7. 2.8 249 km SSE of False Pass, Alaska 14:48 UTC
8. 2.2 248 km SSE of False Pass, Alaska 21:08 UTC
9. 2.2 229 km SSE of False Pass, Alaska 11:57 UTC
10. 3.9 237 km SSE of False Pass, Alaska 14:51 UTC
11. 2.8 178 km SSE of False Pass, Alaska 16:58 UTC
12. 2.8 195 km SSE of False Pass, Alaska 06:53 UTC
13. 2.8 224 km SSE of False Pass, Alaska 22:13 UTC
14. 3.0 240 km SSE of False Pass, Alaska 19:01 UTC
15. 3.0 184 km SSE of False Pass, Alaska 19:19 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:55 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.