QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

72km ENE of Maneadero, B.C., MX

Yes. A magnitude 3.1 earthquake was recorded 72km ENE of Maneadero, B.C., MX, at 8:40 pm PDT on 7 August 2018 (03:40 UTC), 6.1 km deep. 2 people have reported feeling it to USGS.

· 6.1 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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
6.1 km below the surface
Felt
2 reports · strongest reported intensity II
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2948 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 40 km (25 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 1,200 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 6.7 280,000× 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 8,800× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.3× 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 48 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 31.9002, -115.8408. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.2 69km WSW of Alberto Oviedo Mota, B.C., MX
  2. 2.1 70km ENE of Maneadero, B.C., MX
  3. 2.5 54km E of Maneadero, B.C., MX
  4. 2.6 71km WSW of Alberto Oviedo Mota, B.C., MX
  5. 2.3 64km SW of Alberto Oviedo Mota, B.C., MX
  6. 2.6 64km WSW of Alberto Oviedo Mota, B.C., MX
  7. 2.0 47km ENE of Ensenada, B.C., MX
  8. 1.9 52km SSW of Progreso, B.C., MX
  9. 2.3 51km SSW of Progreso, B.C., MX
  10. 2.7 70km WSW of Alberto Oviedo Mota, B.C., MX
  11. 1.8 34km ENE of Ensenada, B.C., MX
  12. 2.3 41km ENE of Maneadero, B.C., MX
  13. 2.3 70km WSW of Alberto Oviedo Mota, B.C., MX
  14. 2.9 70km WSW of Alberto Oviedo Mota, B.C., MX
  15. 2.5 71km WSW 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.