QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

236 km W of Bandon, Oregon

Yes. A magnitude 3.1 earthquake was recorded 236 km W of Bandon, Oregon at 19:37 UTC on 2023-08-15, 15 km deep. 2 people have reported feeling it to USGS.

· 15 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
15 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 1113 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 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× 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.

For this area

The largest earthquake within 50 km since 2016 was M 6.2 on 2018-08-22 — about 45,000 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 43.3288, -127.3009. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.0 239 km W of Bandon, Oregon
  2. 2.9 245 km W of Bandon, Oregon
  3. 2.8 227 km W of Bandon, Oregon
  4. 3.1 236 km WNW of Bandon, Oregon
  5. 3.0 254 km W of Bandon, Oregon
  6. 5.9 239 km W of Bandon, Oregon
  7. 2.8 269 km WNW of Bandon, Oregon
  8. 2.7 262 km W of Bandon, Oregon
  9. 2.7 204 km WNW of Bandon, Oregon
  10. 3.9 206 km W of Langlois, Oregon
  11. 2.5 223 km W of Langlois, Oregon
  12. 3.4 195 km W of Langlois, Oregon
  13. 4.2 194 km W of Langlois, Oregon
  14. 3.7 210 km W of Bandon, Oregon
  15. 2.6 202 km W of Langlois, 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.

On USGS

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