64 km W of Tyonek, Alaska

A magnitude -0.2 earthquake was recorded 64 km W of Tyonek, Alaska at 00:00 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 0.017 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 0.8 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 900,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 640,000,000× the energy of this one
3. Around the size people start to feel M 3.0 57,000× the energy of this one
4. This earthquake M -0.2 about 0.017 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 5.2 on 2017-05-30 — about 110,000,000 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

1. 6.0 Southern Alaska · 36 km ENE of this epicentre Jun 13, 1933
2. 5.7 47 km NW of Beluga, Alaska · 45 km NE of this epicentre Jun 2, 1970
3. 5.7 60 km WNW of Tyonek, Alaska · 16 km NNE of this epicentre Nov 30, 1988
4. 5.3 57 km W of Tyonek, Alaska · 12 km SSE of this epicentre May 30, 2004
5. 5.1 45 km WNW of Nikiski, Alaska · 37 km SSE of this epicentre Apr 18, 1984

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 61.1452, -152.3223. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. -0.4 58 km WNW of Beluga, Alaska 00:39 UTC
2. 0.8 60 km W of Tyonek, Alaska 01:15 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.

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.