Earthquake near Ridgeway, AK

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Ridgeway, 8 km away, the estimate is intensity I (not felt). 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: Kenai, Soldotna, Nikiski, Sterling, Funny River, Kalifornsky.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
3. Around the size people start to feel M 3.0 89× the energy of this one
4. This earthquake M 1.7 about 11 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 2019-01-09 — about 11,000 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

1. 6.8 24 km ENE of Sterling, Alaska · 37 km E of this epicentre Oct 3, 1954
2. 6.7 6 km WNW of Nikiski, Alaska · 22 km NW of this epicentre Jun 18, 1934
3. 6.4 19 km SSE of Tyonek, Alaska · 33 km N of this epicentre Jul 30, 1941
4. 6.0 31 km S of Funny River, Alaska · 47 km SSE of this epicentre Oct 24, 1937
5. 5.7 19 km NNW of Nikiski, Alaska · 33 km NNW 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 60.5995, -151.0621. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.1 10 km SSE of Funny River, Alaska 18:37 UTC
2. 1.8 11 km NNW of Sterling, Alaska 07:44 UTC
3. 2.4 13 km SSW of Tyonek, Alaska 02:16 UTC
4. 1.8 27 km SSE of Funny River, Alaska 02:35 UTC
5. 1.6 11 km WNW of Cohoe, Alaska 01:02 UTC
6. 1.7 23 km WSW of Tyonek, Alaska 04:52 UTC
7. 2.3 23 km SW of Tyonek, Alaska 01:20 UTC
8. 2.0 21 km SW of Tyonek, Alaska 22:44 UTC
9. 1.6 11 km SW of Tyonek, Alaska 11:42 UTC
10. 1.6 3 km NE of Salamatof, Alaska 21:16 UTC
11. 2.3 25 km NNW of Nikiski, Alaska 20:24 UTC
12. 1.5 19 km ESE of Kasilof, Alaska 20:29 UTC
13. 1.5 14 km W of Point Possession, Alaska 00:22 UTC
14. 1.5 10 km W of Point Possession, Alaska 11:09 UTC
15. 1.5 9 km ESE of Kalifornsky, Alaska 05:04 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 21:36 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.