M4.7 Earthquake 139 km W of Puerto Santa, Peru — July 21, 2026
2026-07-21 17:43:01 UTC (3 hours ago) · approx. 12:43 PM UTC-5 local
On July 21, 2026 at 17:43 UTC, a magnitude 4.7 shallow crustal earthquake struck 139 km W of Puerto Santa, Peru, at a depth of 35.0 km and coordinates -9.0849°, -79.9136°. This earthquake was detected by 108 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Peru, a region characterized by the northern Peru-Chile subduction zone, complicated by the subduction of the Nazca Ridge. The nearest mapped fault system is the Peru-Chile Trench. View all earthquakes in Peru.
Learn more: Magnitude scale · Aftershock sequences
Earthquake Details
-79.9136°E
Technical Information
Common Questions
How strong was the magnitude 4.7 earthquake near Puerto Santa, Peru?
The magnitude 4.7 earthquake that struck 139 km W of Puerto Santa, Peru on July 21, 2026 at 17:43 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 -9.0849°, -79.9136°, which is 139 km W of Puerto Santa, Peru. View all earthquakes in Peru.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
Has Peru had earthquakes this big before?
The largest recorded earthquake in Peru was the M8.0 Arequipa earthquake of June 23, 2001. Today's magnitude 4.7 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us7000t29t). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 21, 2026). M4.7 Earthquake 139 km W of Puerto Santa, Peru — July 21, 2026. Retrieved July 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t29t/