M4.5 Earthquake 20 km SSE of Santa María Chico Ometepec, Mexico — September 28, 2020
2020-09-28 23:27:20 UTC (2020-09-28) · approx. 4:27 PM UTC-7 local
Felt by 5 people across nearby locations.
On September 28, 2020 at 23:27 UTC, a magnitude 4.5 shallow crustal earthquake struck 20 km SSE of Santa María Chico Ometepec, Mexico, at a depth of 20.1 km and coordinates 15.9947°, -97.9285°.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Mexico, a region characterized by the Middle America Trench, where the Cocos Plate subducts beneath the North American Plate. The nearest mapped fault system is the Middle America Trench. View all earthquakes in Mexico.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 5 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
-97.9285°E
Technical Information
Common Questions
How strong was the magnitude 4.5 earthquake near Santa María Chico Ometepec, Mexico?
The magnitude 4.5 earthquake that struck 20 km SSE of Santa María Chico Ometepec, Mexico on September 28, 2020 at 23:27 UTC had a depth of 20.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 15.9947°, -97.9285°, which is 20 km SSE of Santa María Chico Ometepec, Mexico. View all earthquakes in Mexico.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Has Mexico had earthquakes this big before?
The largest recorded earthquake in Mexico was the M8.1 Chiapas earthquake of September 8, 2017. Today's magnitude 4.5 event is significantly smaller than that historical record.
Authoritative source: USGS event page (event ID: us6000c2ch). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 28, 2020). M4.5 Earthquake 20 km SSE of Santa María Chico Ometepec, Mexico — September 28, 2020. Retrieved December 5, 2020 from https://www.earthquaketracker.org/earthquakes/event/us6000c2ch/