M3.6 Earthquake 43 km S of Ten Sleep, Wyoming — July 4, 2021
2021-07-04 21:17:42 UTC (2021-07-04) · approx. 2:17 PM UTC-7 local
On July 4, 2021 at 21:17 UTC, a magnitude 3.6 shallow crustal earthquake struck 43 km S of Ten Sleep, Wyoming, at a depth of 16.6 km and coordinates 43.6458°, -107.3763°. The earthquake was reported felt by 3 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 3.8 (light). The nearest populated place is Worland (population 5,487).
Physical scale: An earthquake of magnitude 3.6 releases seismic energy equivalent to roughly 3.8 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 184 m — a useful intuition for the size of the slip patch on the fault.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 3 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 3 | weak | 267,549 |
| MMI 4 | light | 44 |
Earthquake Details
-107.3763°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.6 earthquake near Ten Sleep, Wyoming?
The magnitude 3.6 earthquake that struck 43 km S of Ten Sleep, Wyoming on July 4, 2021 at 21:17 UTC had a depth of 16.6 km. It was felt by 3 people with maximum shaking intensity of MMI 3.8 (light). For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.6 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.6 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000eiql). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 4, 2021). M3.6 Earthquake 43 km S of Ten Sleep, Wyoming — July 4, 2021. Retrieved September 10, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000eiql/