QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

Earthquake near Flagstaff, AZ

USGS: 10 km ESE of Flagstaff, Arizona

7 km (5 mi) ESE of Flagstaff, AZ

2:31 pm MST, Nov 4, 2018 · · 5.0 km deep · released about 1,300 lb of TNT

Every earthquake near Flagstaff Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Coconino County 76 kmYavapai County 112 kmNavajo County 113 km
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
2:31 pm MST on 4 November 2018 ()
Where
10 km (6 mi) ESE of Flagstaff, AZ · earthquakes near Flagstaff
Magnitude
M 3.1 (ml)
Depth
5.0 km below the surface
Felt
228 reports · strongest reported intensity III
Nearest
Coconino County, 76 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2811 days ago

A magnitude 3.1 earthquake was recorded 10 km (6 mi) ESE of Flagstaff, AZ, at 2:31 pm MST on 4 November 2018 (21:31 UTC). 228 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.

Earthquakes near other towns within 30 km: Mountainaire, Kachina Village.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× more

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 3 earthquakes of M5 or more within 50 km:

  1. 6.2 Near Flagstaff, Arizona · 15 km WNW of this epicentre
  2. 6.2 Near Flagstaff, Arizona · 18 km WNW of this epicentre
  3. 5.0 36 km NNE of Flagstaff, Arizona · 37 km N of this epicentre

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 35.1715, -111.5410. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Coconino County, AZ 76 km (47 mi) NNW earthquakes near Coconino County
Yavapai County, AZ 112 km (70 mi) WSW earthquakes near Yavapai County
Navajo County, AZ 113 km (70 mi) ENE earthquakes near Navajo County

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

Aftershocks so far

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

  1. 2.6 20 km NE of Parks, Arizona
  2. 2.7 10 km ESE of Flagstaff, Arizona
  3. 3.0 32 km WSW of LeChee, Arizona
  4. 2.5 35 km WSW of LeChee, Arizona
  5. 3.3 4 km ESE of Flagstaff, Arizona
  6. 2.8 34 km WSW of Winslow West, Arizona
  7. 3.3 13 km E of Flagstaff, Arizona

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

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.