Idaho earthquakes

M3.6 earthquake 8 km NNW of Georgetown, Idaho

A magnitude 3.6 earthquake struck 8 km NNW of Georgetown, Idaho on Sun, Oct 15, 2017, 7:35 PM MDT (01:35 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M4.0 15 km NNW of Georgetown, Idaho. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 3.6 (mwr), minor
Local time: Sun, Oct 15, 2017, 7:35 PM MDT
UTC: 2017-10-16 01:35:34 UTC
Depth: 9.1 km (5.6 mi), shallow
Epicenter: 42.553° N, 111.417° W
Region: Idaho
Felt reports: 6
Strongest shaking: III, weak shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: III, weak shaking
Peak ground acceleration: 109.0% of gravity
Peak ground velocity: 0.4 cm/s
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

6 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Normal
Moment magnitude: 3.6 Mwr
Nodal plane 1: Strike 179°, dip 28°, rake -116°
Nodal plane 2: Strike 27°, dip 65°, rake -77°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 0.7 km horizontally, 3.5 km in depth
Magnitude uncertainty: ±0.04
Depth from: From location
Station coverage gap: 43°
Stations used: 45

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 97 in the 60 days after this one and at least 200 in the 30 days before it.

After

The first 60 of 97.

Before

Earthquakes today Idaho earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us1000asm5 (also filed as uu60253292, uu60253282). Read Sun, Sep 27, 2026, 3:00 PM UTC.