76 km ESE of Sand Point, Alaska

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.7 would have released about 32 times as much.

1. Loma Prieta, California 1989 M 6.9 63× the energy of this one
2. Northridge, California 1994 M 6.7 32× the energy of this one
3. Mineral, Virginia 2011 M 5.8 1.4× the energy of this one
4. This earthquake M 5.7 about 5.4 kilotons of TNT
5. Around the size people start to feel M 3.0 this one released 11,000× 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 55.2036, -159.3181. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 1.8 68 km S of Ivanof Bay, Alaska 05:01 UTC
2. 2.2 93 km SSE of Perryville, Alaska 03:56 UTC
3. 2.0 109 km SE of Sand Point, Alaska 03:42 UTC
4. 2.1 92 km S of Perryville, Alaska 03:26 UTC
5. 2.5 105 km SE of Sand Point, Alaska 03:08 UTC
6. 1.7 59 km ESE of Sand Point, Alaska 02:56 UTC
7. 1.7 82 km S of Perryville, Alaska 02:30 UTC
8. 1.7 70 km S of Ivanof Bay, Alaska 02:07 UTC
9. 1.7 82 km S of Perryville, Alaska 02:01 UTC
10. 1.9 79 km S of Perryville, Alaska 01:57 UTC
11. 1.7 59 km ESE of Sand Point, Alaska 01:00 UTC
12. 3.8 82 km ESE of Sand Point, Alaska 00:35 UTC
13. 4.0 85 km ESE of Sand Point, Alaska 00:35 UTC
14. 1.7 66 km ESE of Sand Point, Alaska 00:30 UTC
15. 1.9 68 km ESE of Sand Point, Alaska 00:16 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 09:23 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 6.1 on 2020-07-22 — it released about 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.