43 km SW of Skwentna, Alaska

A magnitude 1.9 earthquake was recorded 43 km SW of Skwentna, Alaska at 13:00 UTC on 2026-10-01. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
3. Around the size people start to feel M 3.0 45× the energy of this one
4. This earthquake M 1.9 about 21 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 4.5 on 2016-09-01 — about 7,900 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

1. 6.9 27 km SE of Skwentna, Alaska · 47 km ENE of this epicentre Nov 3, 1943
2. 6.2 22 km WSW of Skwentna, Alaska · 30 km N of this epicentre Sep 25, 2014
3. 5.8 46 km SW of Skwentna, Alaska · 4 km WSW of this epicentre Jun 24, 2015
4. 5.7 47 km NW of Beluga, Alaska · 28 km SSE of this epicentre Jun 2, 1970
5. 5.7 60 km WNW of Tyonek, Alaska · 47 km SSW of this epicentre Nov 30, 1988

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 61.6750, -151.8850. Map © OpenStreetMap contributors.

Aftershocks so far

1 earthquake has been recorded within 50 km since this one.

1. -0.4 58 km WNW of Beluga, Alaska 00:39 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:23 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

Revisions

USGS refines a solution as more stations report. Every change we have seen is listed here.

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.