M4.7 Earthquake in the Mariana Islands region — July 9, 2025
2025-07-09 12:14:18 UTC (2025-07-09) · approx. 10:14 PM UTC+10 local
On July 9, 2025 at 12:14 UTC, a magnitude 4.7 intermediate depth earthquake struck in the Mariana Islands region, at a depth of 137.6 km and coordinates 21.7768°, 144.1722°. This earthquake was detected by 92 seismic stations with good 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.
Earthquake Details
144.1722°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake in the Mariana Islands region?
The magnitude 4.7 earthquake that struck in the Mariana Islands region on July 9, 2025 at 12:14 UTC had a depth of 137.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 21.7768°, 144.1722°, which is in the Mariana Islands region.
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.
Actions
Authoritative source: USGS event page (event ID: us7000qbju). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, July 9, 2025). M4.7 Earthquake in the Mariana Islands region — July 9, 2025. Retrieved September 20, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qbju/