122 km SE of Perryville, Alaska

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 240 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.8 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 710× the energy of this one
2. Mineral, Virginia 2011 M 5.8 32× the energy of this one
3. Magna, Utah 2020 M 5.7 22× the energy of this one
4. This earthquake M 4.8 about 240 tons of TNT
5. Around the size people start to feel M 3.0 this one released 500× 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 55.1034, -157.8305. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.2 106 km SSE of Perryville, Alaska 22:15 UTC
2. 5.0 127 km SE of Perryville, Alaska 21:48 UTC
3. 3.9 127 km SSE of Perryville, Alaska 11:47 UTC
4. 3.3 128 km SSE of Chignik, Alaska 12:46 UTC
5. 2.5 124 km SSE of Perryville, Alaska 10:01 UTC
6. 2.4 149 km SE of Perryville, Alaska 00:23 UTC
7. 2.8 163 km SE of Perryville, Alaska 06:03 UTC
8. 2.6 108 km SSE of Chignik, Alaska 16:43 UTC
9. 2.6 132 km SE of Perryville, Alaska 17:14 UTC
10. 2.0 128 km SSE of Perryville, Alaska 17:21 UTC
11. 2.6 76 km SE of Perryville, Alaska 01:56 UTC
12. 2.6 97 km SE of Perryville, Alaska 13:21 UTC
13. 2.3 90 km ESE of Perryville, Alaska 20:29 UTC
14. 2.4 80 km SE of Perryville, Alaska 03:37 UTC
15. 2.6 113 km SE of Perryville, Alaska 18:29 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:17 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 4.9 on 2017-02-27 — it released about 1.4 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.