M4.2 Earthquake 5 km SSW of Lázaro Cárdenas, Mexico — October 18, 2021
2021-10-18 22:31:00 UTC (2021-10-18) · approx. 4:31 PM UTC-6 local
On October 18, 2021 at 22:31 UTC, a magnitude 4.2 intermediate depth earthquake struck 5 km SSW of Lázaro Cárdenas, Mexico, at a depth of 85.7 km and coordinates 15.1343°, -92.5771°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-92.5771°E
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Common Questions
How strong was the magnitude 4.2 earthquake near Lázaro Cárdenas, Mexico?
The magnitude 4.2 earthquake that struck 5 km SSW of Lázaro Cárdenas, Mexico on October 18, 2021 at 22:31 UTC had a depth of 85.7 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 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000fvrc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 18, 2021). M4.2 Earthquake 5 km SSW of Lázaro Cárdenas, Mexico — October 18, 2021. Retrieved December 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fvrc/