82 km SSW of False Pass, 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
3. Around the size people start to feel M 3.0 63× the energy of this one
4. This earthquake M 1.8 about 15 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 54.1470, -163.7811. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.3 118 km ESE of Akutan, Alaska 16:55 UTC
2. 3.3 130 km SSW of False Pass, Alaska 16:54 UTC
3. 2.2 99 km S of False Pass, Alaska 00:43 UTC
4. 2.8 85 km SSW of False Pass, Alaska 05:44 UTC
5. 2.1 111 km ESE of Akutan, Alaska 10:06 UTC
6. 2.3 102 km SSW of False Pass, Alaska 07:23 UTC
7. 2.1 103 km S of False Pass, Alaska 05:05 UTC
8. 2.1 87 km S of False Pass, Alaska 00:33 UTC
9. 2.2 82 km S of False Pass, Alaska 22:52 UTC
10. 2.2 92 km SSW of False Pass, Alaska 16:32 UTC
11. 3.4 118 km S of False Pass, Alaska 16:01 UTC
12. 2.2 111 km SSW of False Pass, Alaska 07:54 UTC
13. 1.9 93 km SSW of False Pass, Alaska 03:12 UTC
14. 2.2 112 km SSW of False Pass, Alaska 00:47 UTC
15. 1.9 112 km SSW of False Pass, Alaska 00:42 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 10:43 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.