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United States · Montana

M3.6 Earthquake near Cascade County, Montana (United States)

UTC time: 2026-09-18 13:40:42 UTC Local time: —

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About this earthquake

A magnitude M3.6 earthquake was recorded near Cascade County, Montana (United States) on September 18, 2026 at 13:40 UTC. The hypocenter lay relatively close to the surface at around 28 km, increasing how strongly it was felt. Shaking of this size is frequently noticed but usually harmless.

The event was recorded by USGS. United States: over the past 24 hours, QuakeMap24 logged 151 earthquakes, the strongest at M4.7.

Details

ID
f25bad135f78a9ab4f25f6d1eda2fbfa34d2308c
Magnitude
M3.6
Depth
27.7 km
UTC time
2026-09-18 13:40:42 UTC
Local time
—
Country
United States
State
Montana
City
Cascade County
County
Cascade County
Source
usgs
Coordinates
47.55720, -111.32440
Temperature
10.2°C

Depth profile

Depth profile Depth: 27.7 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 27.7 km
Shallow
27.7 km
27.7 km — deeper than the regional average (15.2 km)
Regional average: 15.2 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Hell's Half Acre
    Distance: 460 km ·Shield ·Elevation: 1'632 m ·Last eruption: -3250 ·United States
  • Craters of the Moon
    Distance: 495 km ·Volcanic field ·Elevation: 2'005 m ·Last eruption: -130 ·United States

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Great Falls International AirportUnited States · GTF · KGTF
    9.1 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-18

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

United States

Context for this earthquake

18 Sep 2025 – 18 Sep 2026 · M ≥ 3.0 · 1,426 Catalogue entries

Of 1,425 other entries for this area and period, 431 have a higher stored magnitude. Different magnitude types and reports not yet merged limit the comparison.

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Historic earthquake map · United States

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Country statistics · United States

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View earthquake KPIs, strongest and latest events, and averages for this country.

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