M4.0 Earthquake near Off the coast of Valparaiso, Chile — July 18, 2023
2023-07-18 21:08:20 UTC (2023-07-18) · approx. 4:08 PM UTC-5 local
On July 18, 2023 at 21:08 UTC, a magnitude 4.0 shallow crustal earthquake struck near Off the coast of Valparaiso, Chile, at a depth of 21.9 km and coordinates -32.8676°, -72.2120°.
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.
Earthquake Details
-72.2120°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.0 earthquake near Off the coast of Valparaiso, Chile?
The magnitude 4.0 earthquake that struck near Off the coast of Valparaiso, Chile on July 18, 2023 at 21:08 UTC had a depth of 21.9 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
Location
Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000kgnc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 18, 2023). M4.0 Earthquake near Off the coast of Valparaiso, Chile — July 18, 2023. Retrieved September 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kgnc/