QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mwr

275 km WNW of Bandon, Oregon

· 5.5 km deep · released about 15 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 4.0 (mwr)
Depth
5.5 km below the surface
Felt
1 report · strongest reported intensity I
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 783 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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 43.6600, -127.7253. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 5.3 off the coast of Oregon
  2. 3.9 off the coast of Oregon
  3. 2.8 237 km W of Bandon, Oregon
  4. 3.8 265 km WNW of Barview, Oregon
  5. 4.0 241 km W of Bandon, Oregon
  6. 3.6 260 km WNW of Bandon, Oregon
  7. 3.6 261 km WNW of Bandon, Oregon
  8. 3.1 296 km W of Bandon, Oregon
  9. 3.0 265 km WNW of Bandon, Oregon
  10. 3.3 293 km WNW of Bandon, Oregon
  11. 3.1 274 km W of Bandon, Oregon
  12. 3.5 255 km WNW of Barview, Oregon
  13. 2.9 258 km WNW of Bandon, Oregon
  14. 3.0 266 km WNW of Bandon, Oregon
  15. 2.8 283 km W of Bandon, Oregon

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 6.3 on 2019-08-29 — it released about 2,800 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.