Earthquake near Winslow, AZ

USGS: 32 km WSW of LeChee, Arizona

54 km (34 mi) ESE of Flagstaff, AZ

9:24 pm MST, Dec 18, 2021 · 2021-12-19 04:24 UTC · 5.0 km deep · released about 950 lb of TNT

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Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.

When: 9:24 pm MST on 18 December 2021 (2021-12-19 04:24 UTC)
Where: 37 km (23 mi) WSW of Winslow, AZ · earthquakes near Winslow
Magnitude: M 3.0 (ml)
Depth: 5.0 km below the surface
Felt: 7 reports · strongest reported intensity IV
Nearest: Navajo County, 85 km NE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1676 days ago · we first saw it 1676 days ago

A magnitude 3.0 earthquake was recorded 37 km (23 mi) WSW of Winslow, AZ, at 9:24 pm MST on 18 December 2021 (04:24 UTC). 7 people have reported feeling it to USGS. This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

Northridge, California 1994 M 6.7 350,000× the energy of this one
Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
Magna, Utah 2020 M 5.7 11,000× the energy of this one
This earthquake M 3.0 about 950 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

5.1 40 km SSW of Winslow West, Arizona · 29 km SSE of this epicentre Mar 2, 2005

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

Map loads when it scrolls into view

Epicentre 34.9530, -111.0938. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction from the epicentre
Navajo County, AZ	85 km (53 mi)	NE	earthquakes near Navajo County
Coconino County, AZ	115 km (72 mi)	NNW	earthquakes near Coconino County

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.

2.7 5 km W of LeChee, Arizona 04:24 UTC
2.7 10 km ESE of Flagstaff, Arizona 04:09 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:13 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.