M4.0 Earthquake 77 km SW of El Arenal, Mexico — June 11, 2021
2021-06-11 17:45:27 UTC (2021-06-11) · approx. 11:45 AM UTC-6 local
On June 11, 2021 at 17:45 UTC, a magnitude 4.0 shallow crustal earthquake struck 77 km SW of El Arenal, Mexico, at a depth of 20.0 km and coordinates 14.6690°, -93.1945°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.6 mainshock that occurred 25 days ago 77 km SW of Puerto Madero, Mexico. Since the mainshock, the USGS has recorded 5 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-93.1945°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near El Arenal, Mexico?
The magnitude 4.0 earthquake that struck 77 km SW of El Arenal, Mexico on June 11, 2021 at 17:45 UTC had a depth of 20.0 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.
Is this the same earthquake as the M5.6 one earlier?
No. This magnitude 4.0 earthquake is an aftershock of the larger magnitude 5.6 mainshock that occurred earlier 77 km SW of Puerto Madero, Mexico. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000eiwg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, June 11, 2021). M4.0 Earthquake 77 km SW of El Arenal, Mexico — June 11, 2021. Retrieved August 26, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000eiwg/