Earthquake · reviewed by a seismologist
M 3.5ml
Earthquake near Douglas, AZ
No earthquake was likely felt in Douglas in the 24 hours to 2:52 pm MST (21:52 UTC). The last one was M 4.0, 42 km (26 mi) ESE, at 2:57 am MST on 16 August 2026, estimated intensity III (weak) in town. Every earthquake near Douglas
This page: a magnitude 3.5 earthquake was recorded 49 km (31 mi) east-northeast of Douglas, AZ, at 6:06 pm MST on 21 April 2020 (01:06 UTC), 21 km deep. 7 people have reported feeling it to USGS.
USGS: 28 km SSW of Rodeo, New Mexico
- When
- 6:06 pm MST on 21 April 2020 ()
- Where
- 49 km (31 mi) east-northeast of Douglas, AZ · earthquakes near Douglas
- Magnitude
- M 3.5 (ml)
- Depth
- 21 km below the surface
- Felt
- 7 reports · strongest reported intensity III
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Hidalgo County, 48 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2314 days ago
Earthquake alerts for Douglas, AZ
Get a notification in this browser when USGS records an earthquake near Douglas, AZ. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 60 km (37 mi) from the epicentre. In Douglas, 49 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Likely felt in: Douglas 49 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 63,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
- Magna, Utah 2020 M 5.7 2,000× the energy of this one
- This earthquake M 3.5 about 2.7 tons of TNT
- Around the size people start to feel M 3.0 this one released 5.6× 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.
Where
Epicentre 31.5852, -109.1083. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Hidalgo County, NM | 48 km (30 mi) | NE | earthquakes near Hidalgo County |
| Cochise County, AZ | 69 km (43 mi) | WNW | earthquakes near Cochise County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
9 earthquakes have been recorded within 50 km since this one.
- 4.0 41 km ESE of Agua Prieta, Mexico
- 2.6 34 km SSW of Playas, New Mexico
- 2.9 33 km SSW of Playas, New Mexico
- 3.3 21 km SSW of Playas, New Mexico
- 3.3 37 km SSW of Playas, New Mexico
- 3.6 24 km SSE of Animas, New Mexico
- 2.5 33 km SSW of Playas, New Mexico
- 3.1 31 km SSW of Playas, New Mexico
- 3.0 25 km SSW of Rodeo, New Mexico
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
- 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.