M4.2 Earthquake 46 km NNW of Dededo Village, Guam — September 4, 2026
2026-09-04 21:56:09 UTC (2026-09-04) · approx. 7:56 AM UTC+10 local
On September 4, 2026 at 21:56 UTC, a magnitude 4.2 intermediate depth earthquake struck 46 km NNW of Dededo Village, Guam, at a depth of 143.8 km and coordinates 13.9138°, 144.6973°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.3 mainshock that occurred 8 days ago 41 km NNE of Yigo Village, Guam. 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
144.6973°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Dededo Village, Guam?
The magnitude 4.2 earthquake that struck 46 km NNW of Dededo Village, Guam on September 4, 2026 at 21:56 UTC had a depth of 143.8 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.
Is this the same earthquake as the M5.3 one earlier?
No. This magnitude 4.2 earthquake is an aftershock of the larger magnitude 5.3 mainshock that occurred earlier 41 km NNE of Yigo Village, Guam. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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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: us7000tgdn). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, September 4, 2026). M4.2 Earthquake 46 km NNW of Dededo Village, Guam — September 4, 2026. Retrieved September 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000tgdn/