181 km SSE of Unalaska, 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 52.4295, -165.2806. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.6 194 km SSE of Unalaska, Alaska 05:35 UTC
2. 2.6 176 km SE of Unalaska, Alaska 03:34 UTC
3. 2.6 168 km SE of Unalaska, Alaska 02:58 UTC
4. 2.7 189 km SSE of Unalaska, Alaska 06:55 UTC
5. 2.6 189 km SSE of Unalaska, Alaska 23:18 UTC
6. 2.8 172 km SSE of Unalaska, Alaska 15:08 UTC
7. 2.7 182 km SSE of Unalaska, Alaska 19:43 UTC
8. 2.8 189 km SSE of Unalaska, Alaska 11:42 UTC
9. 3.5 175 km SE of Unalaska, Alaska 14:10 UTC
10. 2.6 189 km SSE of Unalaska, Alaska 07:16 UTC
11. 2.4 184 km SSE of Unalaska, Alaska 08:45 UTC
12. 2.5 164 km SSE of Akutan, Alaska 08:11 UTC
13. 2.9 207 km SSE of Unalaska, Alaska 13:34 UTC
14. 2.0 151 km SSE of Unalaska, Alaska 05:37 UTC
15. 2.4 200 km SSE of Unalaska, Alaska 08:34 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:55 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 5.2 on 2019-08-03 — it released about 63,000 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.