QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Salmon, ID

USGS: 14 km NW of Salmon, Idaho

7:22 pm MDT, Mar 28, 2018 · · 6.0 km deep · released about 12 lb of TNT

Every earthquake near Salmon Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lemhi County 39 kmBeaverhead County 91 kmRavalli County 91 kmCuster County 111 kmDeer Lodge 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
7:22 pm MDT on 28 March 2018 ()
Where
15 km (9 mi) NW of Salmon, ID · earthquakes near Salmon
Magnitude
M 1.7 (ml)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
Lemhi County, 39 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3110 days ago

A magnitude 1.7 earthquake was recorded 15 km (9 mi) NW of Salmon, ID, at 7:22 pm MDT on 28 March 2018 (01:22 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 45.2565, -114.0450. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lemhi County, ID 39 km (24 mi) SSE earthquakes near Lemhi County
Beaverhead County, MT 91 km (57 mi) E earthquakes near Beaverhead County
Ravalli County, MT 91 km (57 mi) N earthquakes near Ravalli County
Custer County, ID 111 km (69 mi) S earthquakes near Custer County
Deer Lodge County, MT 117 km (72 mi) NE earthquakes near Deer Lodge County
Idaho County, ID 129 km (80 mi) WNW earthquakes near Idaho County

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

Aftershocks so far

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

  1. 1.7 32 km WSW of Salmon, Idaho
  2. 1.5 32 km WSW of Salmon, Idaho
  3. 1.6 48 km NNW of Challis, Idaho
  4. 1.5 6 km ESE of Salmon, Idaho
  5. 1.6 4 km NNE of Salmon, Idaho
  6. 1.8 45 km SW of Salmon, Idaho
  7. 2.8 25 km NNW of Salmon, Idaho
  8. 1.5 Idaho-Montana border region
  9. 1.6 51 km WSW of Salmon, Idaho
  10. 1.9 18 km S of Salmon, Idaho
  11. 1.8 45 km WSW of Salmon, Idaho
  12. 2.6 46 km WSW of Salmon, Idaho
  13. 1.5 48 km WSW of Salmon, Idaho
  14. 2.0 12 km NNE of Salmon, Idaho
  15. 1.8 14 km S of Salmon, Idaho

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.