QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Enterprise, OR

USGS: 8 km NNE of Enterprise, Oregon

1:55 pm PDT, Apr 11, 2018 · · 3.1 km deep · released about 7.6 lb of TNT

Every earthquake near Enterprise Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Wallowa County 11 kmUnion County 64 kmAsotin County 76 kmAdams County 91 kmBaker County 95 kmNez Perce County 100 kmLewis County 103 kmColumbia County 103 kmGarfield County 107 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
1:55 pm PDT on 11 April 2018 ()
Where
9 km (5 mi) NNE of Enterprise, OR · earthquakes near Enterprise
Magnitude
M 1.6 (ml)
Depth
3.1 km below the surface
Felt
no reports yet
Nearest
Wallowa County, 11 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3095 days ago

A magnitude 1.6 earthquake was recorded 9 km (5 mi) NNE of Enterprise, OR, at 1:55 pm PDT on 11 April 2018 (20:55 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Joseph.

How big was it?

This earthquake released about 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 45.4945, -117.2258. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Wallowa County, OR 11 km (7 mi) NNE earthquakes near Wallowa County
Union County, OR 64 km (40 mi) WSW earthquakes near Union County
Asotin County, WA 76 km (47 mi) N earthquakes near Asotin County
Adams County, ID 91 km (57 mi) SE earthquakes near Adams County
Baker County, OR 95 km (59 mi) SSW earthquakes near Baker County
Nez Perce County, ID 100 km (62 mi) NNE earthquakes near Nez Perce County

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

Aftershocks so far

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

  1. 1.5 3 km SSE of Wallowa, Oregon
  2. 1.6 13 km SW of Lostine, Oregon
  3. 1.6 21 km ESE of Cove, Oregon
  4. 2.0 15 km WSW of Lostine, Oregon
  5. 1.6 14 km NE of Cove, Oregon
  6. 2.1 17 km WSW of Lostine, Oregon
  7. 2.0 15 km WSW of Lostine, Oregon
  8. 1.5 17 km WSW of Lostine, Oregon
  9. 1.8 16 km WSW of Lostine, Oregon
  10. 1.8 16 km WSW of Lostine, Oregon
  11. 2.2 15 km WSW of Lostine, Oregon
  12. 2.7 12 km WSW of Lostine, Oregon
  13. 1.7 12 km WSW of Lostine, Oregon
  14. 2.4 15 km WSW of Lostine, Oregon
  15. 2.2 18 km WSW of Lostine, 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.