M3.4 Earthquake 105 km N of San Juan, Puerto Rico — December 23, 2020
2020-12-23 22:37:59 UTC (2020-12-23) · approx. 6:37 PM UTC-4 local
On December 23, 2020 at 22:37 UTC, a magnitude 3.4 shallow crustal earthquake struck 105 km N of San Juan, Puerto Rico, at a depth of 13.0 km and coordinates 19.4140°, -65.9658°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 2.1 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 140 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 2 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
-65.9658°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near San Juan, Puerto Rico?
The magnitude 3.4 earthquake that struck 105 km N of San Juan, Puerto Rico on December 23, 2020 at 22:37 UTC had a depth of 13.0 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.4 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: pr2020358022). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, December 23, 2020). M3.4 Earthquake 105 km N of San Juan, Puerto Rico — December 23, 2020. Retrieved March 6, 2021 from https://www.earthquaketracker.org/earthquakes/event/pr2020358022/