M4.3 Earthquake in the Mariana Islands region — August 23, 2021
2021-08-23 23:14:14 UTC (2021-08-23) · approx. 9:14 AM UTC+10 local
On August 23, 2021 at 23:14 UTC, a magnitude 4.3 intermediate depth earthquake struck in the Mariana Islands region, at a depth of 295.1 km and coordinates 21.7532°, 142.9981°.
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
142.9981°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake in the Mariana Islands region?
The magnitude 4.3 earthquake that struck in the Mariana Islands region on August 23, 2021 at 23:14 UTC had a depth of 295.1 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.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000f2tj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 23, 2021). M4.3 Earthquake in the Mariana Islands region — August 23, 2021. Retrieved November 2, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f2tj/