QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

146 km W of Pistol River, Oregon

Yes. A magnitude 2.8 earthquake was recorded 146 km W of Pistol River, Oregon at 04:30 UTC on 2023-10-03, 10 km deep. 1 person has reported feeling it to USGS.

· 10 km deep · released about 480 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 2.8 (ml)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity II
Nearest mapped fault
Blanco transform fault, 19 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1065 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 25 km (16 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 lb of TNT

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 5.9 on 2021-06-04 — 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 42.0477, -126.1451. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.7 145 km WSW of Pistol River, Oregon
  2. 2.9 189 km WSW of Pistol River, Oregon
  3. 3.5 155 km W of Pistol River, Oregon
  4. 2.1 134 km WSW of Pistol River, Oregon
  5. 2.9 147 km WSW of Pistol River, Oregon
  6. 2.7 138 km WSW of Port Orford, Oregon
  7. 3.0 146 km WSW of Port Orford, Oregon
  8. 2.6 159 km WSW of Port Orford, Oregon
  9. 2.5 185 km W of Gold Beach, Oregon
  10. 2.7 164 km WSW of Port Orford, Oregon
  11. 4.6 150 km WSW of Port Orford, Oregon
  12. 2.7 138 km WSW of Port Orford, Oregon
  13. 2.6 179 km W of Gold Beach, Oregon
  14. 2.6 139 km WSW of Port Orford, Oregon
  15. 4.9 152 km WSW of Port Orford, 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.