M4.0 Earthquake 6 km ESE of Polkowice, Poland — December 9, 2021
2021-12-09 21:37:33 UTC (2021-12-09) · approx. 10:37 PM UTC+1 local
On December 9, 2021 at 21:37 UTC, a magnitude 4.0 shallow crustal earthquake struck 6 km ESE of Polkowice, Poland, at a depth of 5.0 km and coordinates 51.4770°, 16.1512°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 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 7 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
16.1512°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake near Polkowice, Poland?
The magnitude 4.0 earthquake that struck 6 km ESE of Polkowice, Poland on December 9, 2021 at 21:37 UTC had a depth of 5.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.0 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000gazr). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 9, 2021). M4.0 Earthquake 6 km ESE of Polkowice, Poland — December 9, 2021. Retrieved February 12, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000gazr/