QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

2km ESE of Delta, B.C., MX

Yes. A magnitude 2.1 earthquake was recorded 2km ESE of Delta, B.C., MX, 64 km (40 mi) WSW of Yuma, AZ, at 8:22 pm MST on 4 July 2017 (03:22 UTC), 20 km deep. 1 person has reported feeling it to USGS.

64 km (40 mi) WSW of Yuma, AZ

· 20 km deep · released about 37 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Imperial County 79 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
Magnitude
M 2.1 (ml)
Depth
20 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Imperial County, 79 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3416 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. 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.

How big was it?

This earthquake released about 37 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 410,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 290,000× the energy of this one
  3. Around the size people start to feel M 3.0 26× the energy of this one
  4. This earthquake M 2.1 about 37 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.

Where

Epicentre 32.3458, -115.1750. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Imperial County, CA 79 km (49 mi) NNW earthquakes near Imperial County
Yuma County, AZ 128 km (79 mi) ENE earthquakes near Yuma County

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

Aftershocks so far

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

  1. 2.1 6km NNW of Delta, B.C., MX
  2. 2.7 8km NW of Delta, B.C., MX
  3. 2.1 10km WNW of Alberto Oviedo Mota, B.C., MX
  4. 1.5 4km E of Puebla, B.C., MX
  5. 2.3 5km WNW of Delta, B.C., MX
  6. 2.3 13km SW of Estacion Coahuila, B.C., MX
  7. 3.1 5km W of Alberto Oviedo Mota, B.C., MX
  8. 3.0 19km W of Delta, B.C., MX
  9. 2.7 19km W of Delta, B.C., MX
  10. 2.2 7km N of Delta, B.C., MX
  11. 1.9 3km NW of Delta, B.C., MX
  12. 2.2 18km W of Delta, B.C., MX
  13. 1.7 7km ENE of Calexico, CA
  14. 2.1 6km SW of Delta, B.C., MX
  15. 2.7 12km SSE of Alberto Oviedo Mota, B.C., MX

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.