101 km SE of Halibut Cove, Alaska

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 5,600× the energy of this one
2. Mineral, Virginia 2011 M 5.8 250× the energy of this one
3. Magna, Utah 2020 M 5.7 180× the energy of this one
4. This earthquake M 4.2 about 30 tons of TNT
5. Around the size people start to feel M 3.0 this one released 63× 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 58.8928, -150.1031. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.2 105 km SSE of Halibut Cove, Alaska 22:40 UTC
2. 2.4 99 km SE of Halibut Cove, Alaska 07:05 UTC
3. 3.0 118 km SE of Halibut Cove, Alaska 16:18 UTC
4. 2.3 63 km SE of Halibut Cove, Alaska 19:48 UTC
5. 2.3 58 km SE of Halibut Cove, Alaska 19:18 UTC
6. 2.1 81 km SE of Halibut Cove, Alaska 22:27 UTC
7. 2.4 75 km SE of Halibut Cove, Alaska 08:47 UTC
8. 2.3 74 km SSE of Halibut Cove, Alaska 23:13 UTC
9. 3.2 60 km SSE of Halibut Cove, Alaska 01:51 UTC
10. 1.9 55 km SE of Halibut Cove, Alaska 17:04 UTC
11. 3.4 121 km SE of Port Graham, Alaska 22:57 UTC
12. 2.0 74 km ESE of Halibut Cove, Alaska 18:50 UTC
13. 2.2 106 km SE of Halibut Cove, Alaska 17:54 UTC
14. 2.0 73 km SE of Halibut Cove, Alaska 14:35 UTC
15. 1.9 59 km SE of Halibut Cove, Alaska 04:16 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:59 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 4.2 on 2018-09-14.

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.