QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9mw

39km E of Maneadero, B.C., MX

Yes. A magnitude 3.9 earthquake was recorded 39km E of Maneadero, B.C., MX, at 6:48 pm PST on 10 December 2019 (02:48 UTC), 20 km deep. 61 people have reported feeling it to USGS.

· 20 km deep · released about 9.6 tons of TNT

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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 3.9 (mw)
Depth
20 km below the surface
Felt
61 reports · strongest reported intensity IV
Measured shaking
intensity VI (ShakeMap)
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 757 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 85 km (53 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.

How big was it?

This earthquake released about 9.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 18,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 790× the energy of this one
  3. Magna, Utah 2020 M 5.7 560× the energy of this one
  4. This earthquake M 3.9 about 9.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 20× 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 4.2 on 2018-07-25 — about 3 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 31.7035, -116.1560. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.5 86km ESE of Maneadero, B.C., MX
  2. 3.4 48 km ENE of San Vicente, Mexico
  3. 2.8 55 km ENE of San Vicente, Mexico
  4. 2.5 56 km ENE of San Vicente, Mexico
  5. 3.7 86km ESE of Maneadero, B.C., MX
  6. 2.3 59 km ENE of San Vicente, Mexico
  7. 2.3 85km ESE of Maneadero, B.C., MX
  8. 2.8 86km ESE of Maneadero, B.C., MX
  9. 4.5 47 km ENE of San Vicente, Mexico
  10. 3.0 57km E of Maneadero, B.C., MX
  11. 2.2 38km ESE of Maneadero, B.C., MX
  12. 1.6 42km ENE of Ensenada, B.C., MX
  13. 2.4 80 km SSW of Alberto Oviedo Mota, B.C., MX
  14. 2.5 80km SSW of Alberto Oviedo Mota, B.C., MX
  15. 1.9 57 km ENE of Ensenada, 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.