QuakeIndex

Earthquake · reviewed by a seismologist

M 5.5mww

252 km W of Bandon, Oregon

Yes. A magnitude 5.5 earthquake was recorded 252 km W of Bandon, Oregon at 22:46 UTC on 2018-01-28, 10 km deep. 11 people have reported feeling it to USGS.

· 10 km deep · released about 2.7 kilotons 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 5.5 (mww)
Depth
10 km below the surface
Felt
11 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1655 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

At this magnitude and depth, people at rest would likely notice it out to about 261 km (162 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 2.7 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 63× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2.8× the energy of this one
  3. Magna, Utah 2020 M 5.7 2× the energy of this one
  4. This earthquake M 5.5 about 2.7 kilotons of TNT
  5. Around the size people start to feel M 3.0 this one released 5,600× 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

Tied for the largest within 50 km (31 mi) since 2016, with M 5.5 on 2016-11-28.

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 43.5517, -127.4685. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.1 240 km W of Bandon, Oregon
  2. 5.1 290 km W of Bandon, Oregon
  3. 2.9 241 km W of Bandon, Oregon
  4. 3.4 244 km W of Bandon, Oregon
  5. 5.7 212 km W of Bandon, Oregon
  6. 3.2 209 km W of Bandon, Oregon
  7. 3.3 219 km W of Bandon, Oregon
  8. 3.3 278 km WNW of Bandon, Oregon
  9. 3.9 279 km WNW of Bandon, Oregon
  10. 4.1 290 km WNW of Bandon, Oregon
  11. 2.7 282 km W of Bandon, Oregon
  12. 2.8 226 km WNW of Barview, Oregon
  13. 3.2 225 km W of Langlois, Oregon
  14. 3.0 230 km WNW of Bandon, Oregon
  15. 3.1 263 km WNW 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.

On USGS

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