M4.1 Earthquake in the Maug Islands region, Northern Mariana Islands — September 29, 2023
2023-09-29 22:09:17 UTC (2023-09-29) · approx. 8:09 AM UTC+10 local
On September 29, 2023 at 22:09 UTC, a magnitude 4.1 intermediate depth earthquake struck in the Maug Islands region, Northern Mariana Islands, at a depth of 173.8 km and coordinates 20.1355°, 144.9796°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
144.9796°E
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Common Questions
How strong was the magnitude 4.1 earthquake in the Maug Islands region, Northern Mariana Islands?
The magnitude 4.1 earthquake that struck in the Maug Islands region, Northern Mariana Islands on September 29, 2023 at 22:09 UTC had a depth of 173.8 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ld30). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 29, 2023). M4.1 Earthquake in the Maug Islands region, Northern Mariana Islands — September 29, 2023. Retrieved December 9, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000ld30/