Biggest Earthquakes in Connecticut - USGS Data
Explore the 20 biggest earthquakes across Connecticut in the past 365 days, sourced from USGS data. View significant and minor quakes on our interactive map. No major quakes recorded? Check activity in nearby regions.
Note: This page shows the 20 biggest earthquakes in the region in the past 365 days, regardless of magnitude. Earthquakes smaller than M4.0 are removed after 365 days.
Summary of Biggest Earthquakes
Magnitude Distribution (all magnitudes)
6 M1.5–2.9 earthquakes
Largest Earthquake
Most Recent Major Earthquake
Oldest Major Earthquake
M1.3 at 6 km WNW of Plainfield Village, Connecticut on 6/12/2024
Quick Stats
Time Since Last Earthquake
13 days since the last earthquake (M2.0 at 3 km E of Plainville, Connecticut on 5/20/2025)
Average Magnitude
1.68 (range: M1.3–M2.2)
Largest Earthquake by Depth
Deepest: M1.8 at 10.0 km (2 km SSW of Moodus, Connecticut, 1/18/2025)
Shallowest: M2.0 at 0.0 km (3 km E of Plainville, Connecticut, 5/20/2025)