M4.0 Earthquake in the Pagan region, Northern Mariana Islands — January 21, 2021
2021-01-21 23:56:36 UTC (2021-01-21) · approx. 9:56 AM UTC+10 local
On January 21, 2021 at 23:56 UTC, a magnitude 4.0 intermediate depth earthquake struck in the Pagan region, Northern Mariana Islands, at a depth of 169.3 km and coordinates 18.3441°, 145.5290°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
145.5290°E
Technical Information
Common Questions
How strong was the magnitude 4.0 earthquake in the Pagan region, Northern Mariana Islands?
The magnitude 4.0 earthquake that struck in the Pagan region, Northern Mariana Islands on January 21, 2021 at 23:56 UTC had a depth of 169.3 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 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000dcw0). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, January 21, 2021). M4.0 Earthquake in the Pagan region, Northern Mariana Islands — January 21, 2021. Retrieved March 27, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000dcw0/