QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

30 km ESE of Island Park, Idaho

· 2.6 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 41 kmTeton County 57 kmTeton County 67 kmMadison County 81 kmClark County 108 kmPark County 113 kmBonneville County 117 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 1.8 (ml)
Depth
2.6 km below the surface
Felt
no reports yet
Nearest
Fremont County, 41 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2617 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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.

Where

Epicentre 44.3470, -111.0048. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 41 km (25 mi) ENE of here earthquakes near Fremont County
Teton County, WY 57 km (35 mi) NW of here earthquakes near Teton County
Teton County, ID 67 km (42 mi) NNE of here earthquakes near Teton County
Madison County, ID 81 km (50 mi) NE of here earthquakes near Madison County
Clark County, ID 108 km (67 mi) E of here earthquakes near Clark County
Park County, WY 113 km (70 mi) W of here earthquakes near Park County

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

Aftershocks so far

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

  1. 1.8 25 km SSW of Mammoth, Wyoming
  2. 1.8 24 km SSW of Mammoth, Wyoming
  3. 2.1 24 km SSW of Mammoth, Wyoming
  4. 1.7 24 km SSW of Mammoth, Wyoming
  5. 2.2 24 km SSW of Mammoth, Wyoming
  6. 1.6 24 km SSW of Mammoth, Wyoming
  7. 1.7 24 km SSW of Mammoth, Wyoming
  8. 2.6 24 km SSW of Mammoth, Wyoming
  9. 1.8 24 km SSW of Mammoth, Wyoming
  10. 1.6 24 km SSW of Mammoth, Wyoming
  11. 2.0 24 km SSW of Mammoth, Wyoming
  12. 1.5 24 km SSW of Mammoth, Wyoming
  13. 2.4 24 km SSW of Mammoth, Wyoming
  14. 1.6 7 km ESE of West Yellowstone, Montana
  15. 2.1 43 km SSE of West Yellowstone, Montana

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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2017-06-16 — it released about 7,400 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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