QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4mwr

Earthquake near Clifton, AZ

USGS: 2 km WSW of Franklin, Arizona

10:01 am MST, Apr 27, 2019 · · 10 km deep · released about 1.9 tons of TNT

Every earthquake near Clifton Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Greenlee County 65 kmGrant County 68 kmGraham County 79 kmHidalgo County 91 kmCochise County 112 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
10:01 am MST on 27 April 2019 ()
Where
47 km (29 mi) SSE of Clifton, AZ · earthquakes near Clifton
Magnitude
M 3.4 (mwr)
Depth
10 km below the surface
Felt
16 reports · strongest reported intensity V
Measured shaking
intensity III (ShakeMap)
Nearest
Greenlee County, 65 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2638 days ago

A magnitude 3.4 earthquake was recorded 47 km (29 mi) SSE of Clifton, AZ, at 10:01 am MST on 27 April 2019 (17:01 UTC). 16 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 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 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 one earthquake of M5 or more within 50 km:

  1. 5.3 13 km SW of Franklin, Arizona · 11 km SW 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 32.6665, -109.0994. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Greenlee County, AZ 65 km (40 mi) NNW earthquakes near Greenlee County
Grant County, NM 68 km (42 mi) E earthquakes near Grant County
Graham County, AZ 79 km (49 mi) WNW earthquakes near Graham County
Hidalgo County, NM 91 km (57 mi) SSE earthquakes near Hidalgo County
Cochise County, AZ 112 km (69 mi) SW earthquakes near Cochise County

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

Aftershocks so far

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

  1. 2.8 0 km NE of Clifton, Arizona
  2. 2.6 8 km W of San Simon, Arizona
  3. 2.9 10 km S of Franklin, Arizona
  4. 2.5 1 km SSE of Franklin, Arizona
  5. 2.5 16 km WSW of Lordsburg, New Mexico
  6. 3.3 3 km WSW of Franklin, Arizona
  7. 2.8 4 km SSW of Duncan, Arizona
  8. 2.7 3 km NNE of Franklin, Arizona
  9. 3.0 11 km S of Virden, New Mexico
  10. 3.1 15 km S of Virden, New Mexico
  11. 2.8 Arizona
  12. 2.7 6 km WSW of Franklin, Arizona
  13. 2.8 9 km SE of York, Arizona
  14. 3.2 9 km SSW of Franklin, Arizona
  15. 2.6 9 km WSW of Franklin, 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.