M4.3 Earthquake in the Pagan region, Northern Mariana Islands — September 21, 2023
2023-09-21 19:26:18 UTC (2023-09-21) · approx. 5:26 AM UTC+10 local
On September 21, 2023 at 19:26 UTC, a magnitude 4.3 shallow crustal earthquake struck in the Pagan region, Northern Mariana Islands, at a depth of 65.8 km and coordinates 18.5710°, 146.6283°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
146.6283°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake in the Pagan region, Northern Mariana Islands?
The magnitude 4.3 earthquake that struck in the Pagan region, Northern Mariana Islands on September 21, 2023 at 19:26 UTC had a depth of 65.8 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 4.3 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000lb3a). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, September 21, 2023). M4.3 Earthquake in the Pagan region, Northern Mariana Islands — September 21, 2023. Retrieved December 2, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000lb3a/