QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

15km SSE of Primo Tapia, B.C., MX

Yes. A magnitude 2.1 earthquake was recorded 15km SSE of Primo Tapia, B.C., MX, 85 km (53 mi) SSE of San Diego, CA, at 7:02 pm PDT on 25 September 2020 (02:02 UTC), 18 km deep.

85 km (53 mi) SSE of San Diego, CA

· 18 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 104 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
18 km below the surface
Felt
no reports yet
Nearest
San Diego County, 104 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2236 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 38 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 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 32.0895, -116.8617. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Diego County, CA 104 km (65 mi) N earthquakes near San Diego County

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

Aftershocks so far

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

  1. 2.4 35km NE of Ensenada, B.C., MX
  2. 2.0 19km WNW of El Sauzal, B.C., MX
  3. 1.7 19km W of El Sauzal, B.C., MX
  4. 2.1 32km NE of Ensenada, B.C., MX
  5. 2.7 24km NE of Ensenada, B.C., MX
  6. 2.5 24km WSW of Rosarito, B.C., MX
  7. 1.9 23km SW of Rosarito, B.C., MX
  8. 1.8 20km W of El Sauzal, B.C., MX
  9. 2.5 22km W of El Sauzal, B.C., MX
  10. 2.0 19km NW of El Sauzal, B.C., MX
  11. 2.0 23km W of El Sauzal, B.C., MX
  12. 4.5 20km W of El Sauzal, B.C., MX
  13. 1.7 33km NE of Ensenada, B.C., MX
  14. 1.9 36km NNE of El Sauzal, B.C., MX
  15. 1.7 24km W of Rosarito, 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.