M4.1 Earthquake 186 km N of Saipan, Northern Mariana Islands — July 20, 2023
2023-07-20 19:58:24 UTC (2023-07-20) · approx. 5:58 AM UTC+10 local
On July 20, 2023 at 19:58 UTC, a magnitude 4.1 shallow crustal earthquake struck 186 km N of Saipan, Northern Mariana Islands, at a depth of 9.6 km and coordinates 16.8815°, 146.0008°.
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
146.0008°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake near Saipan, Northern Mariana Islands?
The magnitude 4.1 earthquake that struck 186 km N of Saipan, Northern Mariana Islands on July 20, 2023 at 19:58 UTC had a depth of 9.6 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: us6000kw6v). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, July 20, 2023). M4.1 Earthquake 186 km N of Saipan, Northern Mariana Islands — July 20, 2023. Retrieved September 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000kw6v/