M4.2 Earthquake 28 km SSW of Huachichil, Mexico — July 21, 2020
2020-07-21 19:09:21 UTC (2020-07-21) · approx. 12:09 PM UTC-7 local
On July 21, 2020 at 19:09 UTC, a magnitude 4.2 shallow crustal earthquake struck 28 km SSW of Huachichil, Mexico, at a depth of 10.0 km and coordinates 24.9708°, -100.9265°.
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.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 2 citizen responses 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
-100.9265°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Huachichil, Mexico?
The magnitude 4.2 earthquake that struck 28 km SSW of Huachichil, Mexico on July 21, 2020 at 19:09 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 4.2 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000asjy). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 21, 2020). M4.2 Earthquake 28 km SSW of Huachichil, Mexico — July 21, 2020. Retrieved September 26, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000asjy/