M4.0 Earthquake 5 km SSE of Niltepec, Mexico — September 6, 2021
2021-09-06 22:54:53 UTC (2021-09-06) · approx. 4:54 PM UTC-6 local
On September 6, 2021 at 22:54 UTC, a magnitude 4.0 intermediate depth earthquake struck 5 km SSE of Niltepec, Mexico, at a depth of 81.8 km and coordinates 16.5232°, -94.5932°.
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
-94.5932°E
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Common Questions
How strong was the magnitude 4.0 earthquake near Niltepec, Mexico?
The magnitude 4.0 earthquake that struck 5 km SSE of Niltepec, Mexico on September 6, 2021 at 22:54 UTC had a depth of 81.8 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.
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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: us7000f8qc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 6, 2021). M4.0 Earthquake 5 km SSE of Niltepec, Mexico — September 6, 2021. Retrieved November 17, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f8qc/