QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

47 km WSW of Yachats, Oregon

· 10 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lincoln County 78 kmBenton County 105 km
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
no reports yet
Nearest
Lincoln County, 78 km NE
Nearest mapped fault
Cascadia fold and fault belt, 21 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 3039 days ago

A magnitude 2.8 earthquake was recorded 47 km WSW of Yachats, Oregon at 08:48 UTC on 2018-03-09. This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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 44.2056, -124.6819. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lincoln County, OR 78 km (48 mi) NE earthquakes near Lincoln County
Benton County, OR 105 km (65 mi) ENE earthquakes near Benton County
Coos County, OR 123 km (76 mi) SSE earthquakes near Coos County
Polk County, OR 128 km (79 mi) NE earthquakes near Polk County
Yamhill County, OR 158 km (98 mi) NE earthquakes near Yamhill County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.9 62 km W of Yachats, Oregon
  2. 2.2 32 km W of Yachats, Oregon
  3. 2.5 40 km WNW of Yachats, Oregon
  4. 2.1 71 km W of Yachats, Oregon
  5. 2.5 71 km W of Yachats, Oregon
  6. 1.7 29 km WNW of Yachats, Oregon
  7. 1.7 37 km W of Yachats, Oregon
  8. 1.9 51 km W of Yachats, Oregon
  9. 2.2 71 km W of Yachats, Oregon
  10. 1.9 3 km NW of Yachats, Oregon
  11. 1.7 72 km W of Yachats, Oregon
  12. 1.7 71 km W of Dunes City, Oregon
  13. 1.9 23 km WNW of Yachats, Oregon
  14. 2.8 57 km W of Waldport, Oregon
  15. 2.7 27 km WNW of Yachats, 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.