75 km SW of Sand Point, Alaska

This was a strong earthquake. Damage is likely near the epicentre and it is felt over a wide area.

At this magnitude and depth, people at rest would likely notice it out to about 364 km (226 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 21 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 7.1 would have released about 32 times as much.

1. Ridgecrest, California 2019 M 7.1 32× the energy of this one
2. Loma Prieta, California 1989 M 6.9 16× the energy of this one
3. Northridge, California 1994 M 6.7 7.9× the energy of this one
4. This earthquake M 6.1 about 21 kilotons of TNT
5. Mineral, Virginia 2011 M 5.8 this one released 2.8× more
6. Magna, Utah 2020 M 5.7 this one released 4× 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.

For this area

The largest earthquake within 50 km (31 mi) since our catalogue begins in 2016. The previous largest was M 6.0 on 2018-12-31.

Before 2016, the USGS record lists 51 earthquakes of M5 or more within 50 km; the five largest:

1. 7.1 90 km SE of King Cove, Alaska · 22 km S of this epicentre May 14, 1948
2. 7.0 71 km SE of King Cove, Alaska · 36 km SW of this epicentre May 30, 1991
3. 6.8 73 km SW of Sand Point, Alaska · 4 km NNW of this epicentre Jul 2, 1922
4. 6.7 68 km SSE of King Cove, Alaska · 48 km SW of this epicentre Apr 29, 1937
5. 6.6 72 km SE of King Cove, Alaska · 33 km SW of this epicentre Jan 28, 1963

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 54.7905, -161.2041. Map © OpenStreetMap contributors.

Nearby places

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

1. 1.7 82 km SSW of Sand Point, Alaska 07:47 UTC
2. 1.7 59 km SSW of Sand Point, Alaska 07:22 UTC
3. 2.2 62 km S of Sand Point, Alaska 06:46 UTC
4. 1.8 61 km SSW of Sand Point, Alaska 06:36 UTC
5. 1.8 62 km SSW of Sand Point, Alaska 06:30 UTC
6. 1.9 57 km SSW of Sand Point, Alaska 03:40 UTC
7. 1.8 80 km SSW of Sand Point, Alaska 03:29 UTC
8. 1.8 81 km SSW of Sand Point, Alaska 03:19 UTC
9. 1.6 80 km SSW of Sand Point, Alaska 03:00 UTC
10. 3.3 102 km SSW of Sand Point, Alaska 02:16 UTC
11. 1.6 80 km SSW of Sand Point, Alaska 01:28 UTC
12. 2.3 81 km SSW of Sand Point, Alaska 01:12 UTC
13. 2.8 80 km SSW of Sand Point, Alaska 21:59 UTC
14. 1.6 66 km SSW of Sand Point, Alaska 18:28 UTC
15. 1.6 81 km SSW of Sand Point, Alaska 18:10 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:53 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

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.