M3.9 Earthquake 33 km WSW of Santa Cruz, Chile — May 18, 2025
2025-05-18 18:20:21 UTC (2025-05-18) · approx. 1:20 PM UTC-5 local
On May 18, 2025 at 18:20 UTC, a magnitude 3.9 shallow crustal earthquake struck 33 km WSW of Santa Cruz, Chile, at a depth of 44.3 km and coordinates -34.7762°, -71.6909°.
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 1 citizen response 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
-71.6909°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Santa Cruz, Chile?
The magnitude 3.9 earthquake that struck 33 km WSW of Santa Cruz, Chile on May 18, 2025 at 18:20 UTC had a depth of 44.3 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 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000q01w). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, May 18, 2025). M3.9 Earthquake 33 km WSW of Santa Cruz, Chile — May 18, 2025. Retrieved July 25, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000q01w/