M4.5 Earthquake in the Pagan region, Northern Mariana Islands — August 23, 2025
2025-08-23 23:37:27 UTC (2025-08-23) · approx. 9:37 AM UTC+10 local
On August 23, 2025 at 23:37 UTC, a magnitude 4.5 intermediate depth earthquake struck in the Pagan region, Northern Mariana Islands, at a depth of 248.1 km and coordinates 18.9676°, 145.4429°. This earthquake was detected by 130 seismic stations with good location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
145.4429°E
Technical Information
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Common Questions
How strong was the magnitude 4.5 earthquake in the Pagan region, Northern Mariana Islands?
The magnitude 4.5 earthquake that struck in the Pagan region, Northern Mariana Islands on August 23, 2025 at 23:37 UTC had a depth of 248.1 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 18.9676°, 145.4429°, which is in the Pagan region, Northern Mariana Islands.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000r3e5). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, August 23, 2025). M4.5 Earthquake in the Pagan region, Northern Mariana Islands — August 23, 2025. Retrieved November 12, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000r3e5/