Earthquake near Nikiski, AK

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 8 km (5 mi) from the epicentre. In Nikiski, 15 km away, the estimate is intensity II (weak). 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.

Earthquakes near other towns within 30 km: Ridgeway, Kenai, Sterling, Soldotna, Funny River.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
3. Around the size people start to feel M 3.0 180× the energy of this one
4. This earthquake M 1.5 about 5.4 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.4 on 2017-11-17 — about 22,000 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

1. 6.8 Southern Alaska · 43 km N of this epicentre Apr 27, 1933
2. 6.8 24 km ENE of Sterling, Alaska · 35 km E of this epicentre Oct 3, 1954
3. 6.7 6 km WNW of Nikiski, Alaska · 21 km W of this epicentre Jun 18, 1934
4. 6.4 19 km SSE of Tyonek, Alaska · 21 km N of this epicentre Jul 30, 1941
5. 5.7 19 km NNW of Nikiski, Alaska · 25 km NW of this epicentre Oct 23, 1936

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 60.7084, -151.0151. 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. 1.9 24 km SW of Tyonek, Alaska 02:21 UTC
2. 1.6 6 km ENE of Nikiski, Alaska 11:39 UTC
3. 1.6 16 km NE of Point Possession, Alaska 14:43 UTC
4. 1.7 3 km NNW of Point Possession, Alaska 11:52 UTC
5. 1.6 14 km W of Tyonek, Alaska 21:01 UTC
6. 1.6 21 km SSW of Point Possession, Alaska 09:13 UTC
7. 1.8 4 km ENE of Nikiski, Alaska 05:03 UTC
8. 1.5 20 km NNE of Point Possession, Alaska 10:13 UTC
9. 1.5 17 km N of Sterling, Alaska 12:53 UTC
10. 2.8 8 km NE of Ridgeway, Alaska 14:24 UTC
11. 1.6 21 km SW of Point Possession, Alaska 07:12 UTC
12. 1.7 Southern Alaska 12:57 UTC
13. 2.3 10 km W of Nikiski, Alaska 01:23 UTC
14. 1.5 2 km S of Cohoe, Alaska 23:39 UTC
15. 1.6 17 km E of Beluga, Alaska 22:37 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:28 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.