M4.6 Earthquake 28 km S of Quepos, Costa Rica — September 10, 2026
2026-09-10 18:04:04 UTC (2026-09-10) · approx. 12:04 PM UTC-6 local
Felt by 1 person across nearby locations. Aftershock of the M5.0 mainshock.
On September 10, 2026 at 18:04 UTC, a magnitude 4.6 shallow crustal earthquake struck 28 km S of Quepos, Costa Rica, at a depth of 35.0 km and coordinates 9.1718°, -84.1473°. This earthquake was detected by 77 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 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 5.0 mainshock that occurred 26 days ago 44 km SSE of Quepos, Costa Rica. Since the mainshock, the USGS has recorded 1 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
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
-84.1473°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.6 earthquake near Quepos, Costa Rica?
The magnitude 4.6 earthquake that struck 28 km S of Quepos, Costa Rica on September 10, 2026 at 18:04 UTC had a depth of 35.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 9.1718°, -84.1473°, which is 28 km S of Quepos, Costa Rica.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.0 one earlier?
No. This magnitude 4.6 earthquake is an aftershock of the larger magnitude 5.0 mainshock that occurred earlier 44 km SSE of Quepos, Costa Rica. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Authoritative source: USGS event page (event ID: us7000tget). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 10, 2026). M4.6 Earthquake 28 km S of Quepos, Costa Rica — September 10, 2026. Retrieved September 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000tget/