M3.5 Earthquake 3 km NE of Eastborough, Kansas — March 14, 2021
2021-03-14 23:08:31 UTC (2021-03-14) · approx. 5:08 PM UTC-6 local
Felt by 1,765 people across a wide area. Maximum shaking intensity MMI 4.7 (moderate).
On March 14, 2021 at 23:08 UTC, a magnitude 3.5 shallow crustal earthquake struck 3 km NE of Eastborough, Kansas, at a depth of 5.0 km and coordinates 37.7131°, -97.2346°. The earthquake was reported felt by 1,765 peopleacross a wide area, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 4.7 (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.
What the Shaking Felt Like
At MMI 4.7 (moderate), people in the most strongly affected areas would have experienced: Mild shaking, similar to a passing truck. Hanging objects swing. Glasses and dishes may rattle. Not commonly felt outdoors.
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 1,765 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
-97.2346°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.5 earthquake near Eastborough, Kansas?
The magnitude 3.5 earthquake that struck 3 km NE of Eastborough, Kansas on March 14, 2021 at 23:08 UTC had a depth of 5.0 km. It was felt by 1,765 people with maximum shaking intensity of MMI 4.7 (moderate). For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 37.7131°, -97.2346°, which is 3 km NE of Eastborough, 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: us7000djda). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, March 14, 2021). M3.5 Earthquake 3 km NE of Eastborough, Kansas — March 14, 2021. Retrieved November 11, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000djda/