QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7mw

117 km W of Petrolia, CA

· 10 km deep · released about 6.1 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 3.7 (mw)
Depth
10 km below the surface
Felt
5 reports · strongest reported intensity III
Measured shaking
intensity I (ShakeMap)
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1023 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 6.1 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 28,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 870× the energy of this one
  4. This earthquake M 3.7 about 6.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 13× 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 40.3660, -125.6612. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.8 76 km WNW of Petrolia, CA
  2. 2.4 76 km WNW of Petrolia, CA
  3. 2.9 123 km WNW of Petrolia, CA
  4. 2.9 93 km WNW of Petrolia, CA
  5. 3.4 80 km WNW of Petrolia, CA
  6. 3.9 127 km WNW of Petrolia, CA
  7. 4.2 118 km WNW of Petrolia, CA
  8. 2.7 72 km WNW of Petrolia, CA
  9. 3.7 108 km WNW of Petrolia, CA
  10. 2.6 75 km WNW of Petrolia, CA
  11. 2.9 165 km W of Ferndale, California
  12. 2.8 87 km WNW of Petrolia, CA
  13. 2.4 84 km WNW of Petrolia, CA
  14. 2.3 160 km W of Ferndale, California
  15. 2.6 94 km WNW of Petrolia, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 6.6 on 2016-12-08 — it released about 19,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.