QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

45km ENE of Maneadero, B.C., MX

Yes. A magnitude 3.1 earthquake was recorded 45km ENE of Maneadero, B.C., MX, at 8:18 pm PST on 31 December 2017 (04:18 UTC), 12 km deep. 3 people have reported feeling it to USGS.

· 12 km deep · released about 1,300 lb 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 3.1 (ml)
Depth
12 km below the surface
Felt
3 reports · strongest reported intensity III
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1558 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 39 km (24 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 260,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,200× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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.

Where

Epicentre 31.8492, -116.1185. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.1 72km ENE of Maneadero, B.C., MX
  2. 3.3 72km ENE of Maneadero, B.C., MX
  3. 2.8 69km WSW of Alberto Oviedo Mota, B.C., MX
  4. 2.2 70km WSW of Alberto Oviedo Mota, B.C., MX
  5. 2.6 52km SSW of Progreso, B.C., MX
  6. 2.0 41km ENE of Ensenada, B.C., MX
  7. 1.9 34km NE of Ensenada, B.C., MX
  8. 1.7 70km WSW of Alberto Oviedo Mota, B.C., MX
  9. 2.8 72km WSW of Alberto Oviedo Mota, B.C., MX
  10. 1.8 35km ENE of Ensenada, B.C., MX
  11. 3.0 70km ENE of Maneadero, B.C., MX
  12. 4.0 71km ENE of Maneadero, B.C., MX
  13. 2.2 31km ENE of Ensenada, B.C., MX
  14. 3.0 34km ENE of Ensenada, B.C., MX
  15. 3.0 33km 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.