M3.3 Earthquake 5 km E of Assaria, Kansas — August 4, 2025
2025-08-04 23:20:58 UTC (2025-08-04) · approx. 4:20 PM UTC-7 local
Felt by 22 people across nearby locations.
On August 4, 2025 at 23:20 UTC, a magnitude 3.3 shallow crustal earthquake struck 5 km E of Assaria, Kansas, at a depth of 9.9 km and coordinates 38.6742°, -97.5380°. This earthquake was detected by 40 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 175, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 3.3 releases seismic energy equivalent to roughly 1.3 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 114 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 22 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
-97.5380°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.3 earthquake near Assaria, Kansas?
The magnitude 3.3 earthquake that struck 5 km E of Assaria, Kansas on August 4, 2025 at 23:20 UTC had a depth of 9.9 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 38.6742°, -97.5380°, which is 5 km E of Assaria, Kansas.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.3 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us6000qy4b). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 4, 2025). M3.3 Earthquake 5 km E of Assaria, Kansas — August 4, 2025. Retrieved October 17, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000qy4b/