M4.3 Earthquake 43 km S of Santiago Tepextla, Mexico — October 18, 2021
2021-10-18 18:10:19 UTC (2021-10-18) · approx. 11:10 AM UTC-7 local
On October 18, 2021 at 18:10 UTC, a magnitude 4.3 shallow crustal earthquake struck 43 km S of Santiago Tepextla, Mexico, at a depth of 10.0 km and coordinates 15.9446°, -98.4740°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 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
-98.4740°E
Technical Information
Common Questions
How strong was the magnitude 4.3 earthquake near Santiago Tepextla, Mexico?
The magnitude 4.3 earthquake that struck 43 km S of Santiago Tepextla, Mexico on October 18, 2021 at 18:10 UTC had a depth of 10.0 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000fvpt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 18, 2021). M4.3 Earthquake 43 km S of Santiago Tepextla, Mexico — October 18, 2021. Retrieved December 25, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000fvpt/