M2.5 Earthquake 4 km E of Riverside, Maryland — October 27, 2025
2025-10-27 21:17:00 UTC (2025-10-27) · approx. 4:17 PM UTC-5 local
Felt by 1,228 people across a wide area.
On October 27, 2025 at 21:17 UTC, a magnitude 2.5 shallow crustal earthquake struck 4 km E of Riverside, Maryland, at a depth of 8.5 km and coordinates 39.1805°, -76.8331°. This earthquake was detected by 31 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 476, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 2.5 releases seismic energy equivalent to roughly 84.8 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 32 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 1,228 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
-76.8331°E
Technical Information
Common Questions
How strong was the magnitude 2.5 earthquake near Riverside, Maryland?
The magnitude 2.5 earthquake that struck 4 km E of Riverside, Maryland on October 27, 2025 at 21:17 UTC had a depth of 8.5 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 39.1805°, -76.8331°, which is 4 km E of Riverside, Maryland.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 2.5 earthquakes can continue for several days and gradually diminish over time.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Authoritative source: USGS event page (event ID: us6000rjt7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, October 27, 2025). M2.5 Earthquake 4 km E of Riverside, Maryland — October 27, 2025. Retrieved May 26, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000rjt7/