M4.2 Earthquake in the Mariana Islands region — July 15, 2026
2026-07-15 21:40:06 UTC (2026-07-15) · approx. 7:40 AM UTC+10 local
On July 15, 2026 at 21:40 UTC, a magnitude 4.2 deep-focus earthquake struck in the Mariana Islands region, at a depth of 309.8 km and coordinates 21.5312°, 143.1798°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
143.1798°E
Technical Information
Common Questions
How strong was the magnitude 4.2 earthquake in the Mariana Islands region?
The magnitude 4.2 earthquake that struck in the Mariana Islands region on July 15, 2026 at 21:40 UTC had a depth of 309.8 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000t0tx). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 15, 2026). M4.2 Earthquake in the Mariana Islands region — July 15, 2026. Retrieved August 6, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t0tx/