M4.3 Earthquake 18 km NNW of Dededo Village, Guam — August 28, 2021
2021-08-28 19:20:37 UTC (2021-08-28) · approx. 5:20 AM UTC+10 local
On August 28, 2021 at 19:20 UTC, a magnitude 4.3 intermediate depth earthquake struck 18 km NNW of Dededo Village, Guam, at a depth of 119.7 km and coordinates 13.6639°, 144.7530°.
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
144.7530°E
Technical Information
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Common Questions
How strong was the magnitude 4.3 earthquake near Dededo Village, Guam?
The magnitude 4.3 earthquake that struck 18 km NNW of Dededo Village, Guam on August 28, 2021 at 19:20 UTC had a depth of 119.7 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: us7000f8wt). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 28, 2021). M4.3 Earthquake 18 km NNW of Dededo Village, Guam — August 28, 2021. Retrieved November 6, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f8wt/