M3.5 Earthquake near Kansas — August 9, 2021
2021-08-09 19:29:31 UTC (2021-08-09) · approx. 12:29 PM UTC-7 local
Felt by 17 people across nearby locations. Maximum shaking intensity MMI 4.6 (moderate).
On August 9, 2021 at 19:29 UTC, a magnitude 3.5 shallow crustal earthquake struck near Kansas, at a depth of 5.0 km and coordinates 39.7204°, -98.3878°. The earthquake was reported felt by 17 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 4.6 (moderate).
Physical scale: An earthquake of magnitude 3.5 releases seismic energy equivalent to roughly 2.7 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 157 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 17 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
Earthquake Details
-98.3878°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.5 earthquake near Kansas?
The magnitude 3.5 earthquake that struck near Kansas on August 9, 2021 at 19:29 UTC had a depth of 5.0 km. It was felt by 17 people with maximum shaking intensity of MMI 4.6 (moderate). For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 39.7204°, -98.3878°, which is near Kansas.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.5 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us6000f3nc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 9, 2021). M3.5 Earthquake near Kansas — August 9, 2021. Retrieved December 8, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f3nc/