QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6ml

10km W of Progreso, B.C., MX

Yes. A magnitude 3.6 earthquake was recorded 10km W of Progreso, B.C., MX, at 4:26 am PDT on 28 August 2020 (11:26 UTC), 15 km deep. 22 people have reported feeling it to USGS.

· 15 km deep · released about 4.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Imperial County 61 kmSan Diego County 114 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 3.6 (ml)
Depth
15 km below the surface
Felt
22 reports · strongest reported intensity III
Measured shaking
intensity V (ShakeMap)
Nearest
Imperial County, 61 km NNE
Nearest mapped fault
Yuha Basin faults, 15 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2103 days ago

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 71 km (44 mi) from the epicentre. 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: Calexico 22 km, intensity III · El Centro 28 km, intensity III · Imperial 33 km, intensity II · Holtville 40 km, intensity II · Brawley 48 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 4.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 38,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,200× the energy of this one
  4. This earthquake M 3.6 about 4.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 9.4× 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

The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-07-31 — about 3.7 times the energy of this one.

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 32.5673, -115.6892. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Imperial County, CA 61 km (38 mi) NNE earthquakes near Imperial County
San Diego County, CA 114 km (71 mi) WNW earthquakes near San Diego County

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

Aftershocks so far

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

  1. 3.5 12km N of Delta, B.C., MX
  2. 1.9 12km N of Delta, B.C., MX
  3. 1.8 15km NW of Ocotillo, CA
  4. 1.7 15km N of Ocotillo, CA
  5. 2.6 21km NNE of Ocotillo, CA
  6. 1.5 8km WNW of Holtville, CA
  7. 1.8 17km S of Progreso, B.C., MX
  8. 1.5 20km N of Ocotillo, CA
  9. 1.6 16km E of Ocotillo, CA
  10. 1.6 2km SSW of Brawley, CA
  11. 1.9 2km WSW of Brawley, CA
  12. 1.9 5km SSW of Brawley, CA
  13. 2.8 7km SW of Westmorland, CA
  14. 2.9 7 km WNW of Imperial, California
  15. 1.6 52km S of Ocotillo, CA

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.