M4.9 Earthquake 163 km S of Sámara, Costa Rica — August 10, 2026
2026-08-10 20:54:58 UTC (2026-08-10) · approx. 2:54 PM UTC-6 local
On August 10, 2026 at 20:54 UTC, a magnitude 4.9 shallow crustal earthquake struck 163 km S of Sámara, Costa Rica, at a depth of 10.0 km and coordinates 8.4074°, -85.5543°. This earthquake was detected by 68 seismic stations with good location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-85.5543°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near Sámara, Costa Rica?
The magnitude 4.9 earthquake that struck 163 km S of Sámara, Costa Rica on August 10, 2026 at 20:54 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 8.4074°, -85.5543°, which is 163 km S of Sámara, Costa Rica.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us6000tjsr). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, August 10, 2026). M4.9 Earthquake 163 km S of Sámara, Costa Rica — August 10, 2026. Retrieved August 20, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000tjsr/