M4.6 Earthquake near southern Mid-Atlantic Ridge — July 18, 2026
2026-07-18 17:36:42 UTC (2026-07-18) · approx. 4:36 PM UTC-1 local
Aftershock of the M5.3 mainshock.
On July 18, 2026 at 17:36 UTC, a magnitude 4.6 shallow crustal earthquake struck near southern Mid-Atlantic Ridge, at a depth of 10.0 km and coordinates -12.6050°, -15.0258°. This earthquake was detected by 28 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 5.3 mainshock that occurred 13 hours ago near southern Mid-Atlantic Ridge. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
-15.0258°E
Technical Information
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Common Questions
How strong was the magnitude 4.6 earthquake near southern Mid-Atlantic Ridge?
The magnitude 4.6 earthquake that struck near southern Mid-Atlantic Ridge on July 18, 2026 at 17:36 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 -12.6050°, -15.0258°, which is near southern Mid-Atlantic Ridge.
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 M5.3 one earlier?
No. This magnitude 4.6 earthquake is an aftershock of the larger magnitude 5.3 mainshock that occurred earlier near southern Mid-Atlantic Ridge. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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Authoritative source: USGS event page (event ID: us7000t2z2). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 18, 2026). M4.6 Earthquake near southern Mid-Atlantic Ridge — July 18, 2026. Retrieved August 2, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t2z2/