QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

Earthquake near Manhattan, MT

No earthquake was likely felt in Manhattan in the 24 hours to 2:58 pm MST (21:58 UTC). The last one was M 2.1, 9 km (6 mi) NNW, at 9:42 pm MDT on 2 September 2025, estimated intensity II (weak) in town. Every earthquake near Manhattan

This page: a magnitude 3.3 earthquake was recorded 4 km (2 mi) west of Manhattan, MT, at 7:40 pm MDT on 4 August 2019 (01:40 UTC), 5.0 km deep. 28 people have reported feeling it to USGS.

USGS: 3 km W of Manhattan, Montana

32 km (20 mi) NW of Bozeman, MT

7:40 pm MDT, Aug 4, 2019 · · 5.0 km deep · released about 1.3 tons of TNT

Every earthquake near Manhattan Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 41 kmBroadwater County 53 kmJefferson County 60 kmMadison County 72 kmPark County 79 kmMeagher County 88 kmSilver Bow County 99 kmSweet Grass County 111 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
7:40 pm MDT on 4 August 2019 ()
Where
4 km (2 mi) west of Manhattan, MT · earthquakes near Manhattan
Montana today
every earthquake in Montana in the last 24 hours
Magnitude
M 3.3 (ml)
Depth
5.0 km below the surface
Felt
28 reports · strongest reported intensity IV
Nearest
Gallatin County, 41 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2580 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 52 km (32 mi) from the epicentre. In Manhattan, 4 km away, the estimate is intensity III (weak). 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.

Likely felt in: Manhattan 4 km, intensity III · Three Forks 14 km, intensity III · Belgrade 18 km, intensity III · Bozeman 33 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× more

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 4.0 on 2019-07-14 — about 11 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.6 The 1925 Clarkston Valley, Montana Earthquake · 27 km NNW of this epicentre
  2. 6.4 Clarkston Valley, Montana (Aftershock) · 27 km NNW of this epicentre
  3. 5.5 Clarkston Valley, Montana (Aftershock) · 27 km NNW of this epicentre
  4. 5.5 Clarkston Valley, Montana (Aftershock) · 27 km NNW of this epicentre
  5. 5.5 Clarkston Valley, Montana (Aftershock) · 27 km NNW of this epicentre

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 45.8579, -111.3810. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Gallatin County, MT 41 km (26 mi) SSE earthquakes near Gallatin County
Broadwater County, MT 53 km (33 mi) N earthquakes near Broadwater County
Jefferson County, MT 60 km (37 mi) WNW earthquakes near Jefferson County
Madison County, MT 72 km (45 mi) SW earthquakes near Madison County
Park County, MT 79 km (49 mi) ESE earthquakes near Park County
Meagher County, MT 88 km (55 mi) NNE earthquakes near Meagher County

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

Aftershocks so far

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

  1. 1.7 3 km WNW of Manhattan, Montana
  2. 1.5 4 km NW of Logan, Montana
  3. 1.5 2 km WNW of Manhattan, Montana
  4. 1.8 1 km W of Manhattan, Montana
  5. 1.7 0 km ESE of Manhattan, Montana
  6. 2.2 9 km SSE of Harrison, Montana
  7. 2.1 3 km WSW of Manhattan, Montana
  8. 2.0 2 km WNW of Manhattan, Montana
  9. 1.8 2 km WNW of Manhattan, Montana
  10. 1.9 9 km SSE of Harrison, Montana
  11. 2.0 9 km SSE of Harrison, Montana
  12. 2.0 18 km SW of Amsterdam, Montana
  13. 1.7 3 km WNW of Manhattan, Montana
  14. 2.2 2 km WSW of Manhattan, Montana
  15. 1.5 2 km WNW of Manhattan, 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.

On USGS

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