M4.7 Earthquake in the Mariana Islands region — January 25, 2023
2023-01-25 22:27:31 UTC (2023-01-25) · approx. 8:27 AM UTC+10 local
On January 25, 2023 at 22:27 UTC, a magnitude 4.7 shallow crustal earthquake struck in the Mariana Islands region, at a depth of 35.0 km and coordinates 20.2110°, 146.2083°. This earthquake was detected by 91 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
146.2083°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 January 25, 2023 at 22:27 UTC had a depth of 35.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 20.2110°, 146.2083°, 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: us6000jja4). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, January 25, 2023). M4.7 Earthquake in the Mariana Islands region — January 25, 2023. Retrieved April 11, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000jja4/