M4.1 Earthquake in the Pagan region, Northern Mariana Islands — October 30, 2021
2021-10-30 17:12:50 UTC (2021-10-30) · approx. 3:12 AM UTC+10 local
On October 30, 2021 at 17:12 UTC, a magnitude 4.1 intermediate depth earthquake struck in the Pagan region, Northern Mariana Islands, at a depth of 278.0 km and coordinates 18.6027°, 145.3809°.
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
145.3809°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake in the Pagan region, Northern Mariana Islands?
The magnitude 4.1 earthquake that struck in the Pagan region, Northern Mariana Islands on October 30, 2021 at 17:12 UTC had a depth of 278.0 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: us7000frfa). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 30, 2021). M4.1 Earthquake in the Pagan region, Northern Mariana Islands — October 30, 2021. Retrieved January 14, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000frfa/