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Moderate mag. 3.9 earthquake - Wyoming, 17 mi northeast of West Yellowstone, Gallatin County, Montana, USA, on Sunday, Sep 18, 2022 at 6:55 am (GMT -6) -

Moderate mag. 3.9 earthquake - Wyoming, 17 mi northeast of West Yellowstone, Gallatin County, Montana, USA, on Sunday, Sep 18, 2022 at 6:55 am (GMT -6) Moderate mag. 3.9 earthquake - Wyoming, 17 mi northeast of West Yellowstone, Gallatin County, Montana, USA, on Sunday, Sep 18, 2022 at 6:55 am (GMT -6)

Moderate magnitude 3.9 earthquake at 10 km depth

18 Sep 13:01 UTC: First to report: USGS after 6 minutes.
18 Sep 13:22: Magnitude recalculated from 3.6 to 3.9. Hypocenter depth recalculated from 10.5 to 10.3 km (from 6.5 to 6.4 mi).

Earthquake details

Date & timeSep 18, 2022 12:55:19 UTC -
Local time at epicenterSunday, Sep 18, 2022 at 6:55 am (GMT -6)
Depth10.3 km
Epicenter latitude / longitude44.7885°N / 110.8105°W (Park, Wyoming, United States)
Antipode44.789°S / 69.19°E
Shaking intensityWeak shaking
Felt5 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoYellowstone (41 km / 25 mi)
Nearby towns and cities23 km (14 mi) SSW of Mammoth (pop: 263) | Show on map | Quakes nearby
27 km (17 mi) ENE of West Yellowstone (Montana) (pop: 1,340) | Show on map | Quakes nearby
70 km (44 mi) SE of Big Sky (Montana) (pop: 2,310) | Show on map | Quakes nearby
99 km (62 mi) S of Livingston (Park County, Montana) (pop: 7,300) | Show on map | Quakes nearby
101 km (63 mi) S of Bozeman (Montana) (pop: 43,400) | Show on map | Quakes nearby
132 km (82 mi) NE of Rexburg (Madison County, Idaho) (pop: 27,700) | Show on map | Quakes nearby
177 km (110 mi) NNE of Idaho Falls (pop: 59,200) | Show on map | Quakes nearby
191 km (119 mi) SE of Butte (Montana) (pop: 34,200) | Show on map | Quakes nearby
Weather at epicenter at time of quakeFew Clouds -5.1°C (23 F), humidity: 95%, wind: 2 m/s (3 kts) from ESE
Estimated seismic energy released4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
3.910.3 kmWyomingUSGS
3.910.3 kmYellowstone Region, WyomingRaspberryShake
3.910 kmYellowstone Region, WyomingIRIS
4.210 kmYellowstone Region, WyomingGFZ


Seismic station: Flagg Ranch, Wyoming, USA (FLWY/IW network) | Distance from quake: 79 km / 49 mi | Show on map | Station Info
Seismic station Flagg Ranch, Wyoming, USA: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (5)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
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Send your own user report!
West Yellowstone Montana / Light shaking (MMI IV) / complex rolling (tilting in multiple directions) / 2-5 s : It felt like a rolling or ripple type motion with two distinct ripples to it within a span of 2-3 seconds. Slight building creaking sound at the same time. | 5 users found this interesting.  
Madison campground / Weak shaking (MMI III) / 2-5 s : Thought an animal was shaking our motor home, jumped up and looked out all the windows and nothing was there | 2 users found this interesting.  
Yellowstone National t (16.2 km SSW of epicenter) [Map] / Light shaking (MMI IV) / vibration and rolling
West Yellowstone, MT / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / 10-15 s : It felt like a sideways rolling action, and repeated twice. A gentle, rocking movement.  
Island Park idaho / Very weak shaking (MMI II) / single lateral shake / 2-5 s (reported through our app)

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