102 km SSE of Perryville, 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 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
2. Magna, Utah 2020 M 5.7 350,000× the energy of this one
3. Around the size people start to feel M 3.0 32× the energy of this one
4. This earthquake M 2.0 about 30 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 55.0207, -158.7035. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.4 108 km SSE of Perryville, Alaska 23:00 UTC
2. 2.2 62 km SSE of Perryville, Alaska 06:21 UTC
3. 2.3 84 km SSE of Perryville, Alaska 15:45 UTC
4. 2.4 123 km SE of Sand Point, Alaska 06:48 UTC
5. 2.0 66 km SSE of Perryville, Alaska 00:38 UTC
6. 2.4 117 km SE of Sand Point, Alaska 00:01 UTC
7. 2.2 116 km ESE of Sand Point, Alaska 11:11 UTC
8. 2.2 107 km ESE of Sand Point, Alaska 04:11 UTC
9. 2.8 114 km SE of Sand Point, Alaska 03:16 UTC
10. 2.9 98 km ESE of Sand Point, Alaska 03:35 UTC
11. 2.3 114 km ESE of Sand Point, Alaska 02:43 UTC
12. 1.9 96 km SSE of Perryville, Alaska 05:01 UTC
13. 1.7 123 km SSE of Perryville, Alaska 05:09 UTC
14. 2.3 108 km ESE of Sand Point, Alaska 14:05 UTC
15. 2.3 97 km SSE of Perryville, Alaska 08:32 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:11 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 7.8 on 2020-07-22 — it released about 500,000,000 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.