M4.4 Earthquake 190 km ENE of Saipan, Northern Mariana Islands — August 11, 2021
2021-08-11 21:48:31 UTC (2021-08-11) · approx. 7:48 AM UTC+10 local
On August 11, 2021 at 21:48 UTC, a magnitude 4.4 shallow crustal earthquake struck 190 km ENE of Saipan, Northern Mariana Islands, at a depth of 10.0 km and coordinates 15.8891°, 147.3858°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
147.3858°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.4 earthquake near Saipan, Northern Mariana Islands?
The magnitude 4.4 earthquake that struck 190 km ENE of Saipan, Northern Mariana Islands on August 11, 2021 at 21:48 UTC had a depth of 10.0 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 4.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000f8v1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 11, 2021). M4.4 Earthquake 190 km ENE of Saipan, Northern Mariana Islands — August 11, 2021. Retrieved October 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f8v1/