M3.9 Earthquake 169 km ENE of Ponce Inlet, Florida — June 18, 2021
2021-06-18 19:48:39 UTC (2021-06-18) · approx. 2:48 PM UTC-5 local
Felt by 14 people across nearby locations.
On June 18, 2021 at 19:48 UTC, a magnitude 3.9 shallow crustal earthquake struck 169 km ENE of Ponce Inlet, Florida, at a depth of 0.0 km and coordinates 29.7433°, -79.3493°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 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 14 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
-79.3493°E
Technical Information
Common Questions
How strong was the magnitude 3.9 earthquake near Ponce Inlet, Florida?
The magnitude 3.9 earthquake that struck 169 km ENE of Ponce Inlet, Florida on June 18, 2021 at 19:48 UTC had a depth of 0.0 km. For context, this was a minor earthquake typically detected only by instruments.
Where did the earthquake occur?
The earthquake epicenter was located at 29.7433°, -79.3493°, which is 169 km ENE of Ponce Inlet, Florida.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.9 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us7000ee8n). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, June 18, 2021). M3.9 Earthquake 169 km ENE of Ponce Inlet, Florida — June 18, 2021. Retrieved October 12, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000ee8n/