M4.2 Earthquake 287 km SSW of Maitum, Philippines — August 20, 2021
2021-08-20 22:21:53 UTC (2021-08-20) · approx. 6:21 AM UTC+8 local
On August 20, 2021 at 22:21 UTC, a magnitude 4.2 deep-focus earthquake struck 287 km SSW of Maitum, Philippines, at a depth of 465.4 km and coordinates 3.6765°, 123.4147°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
123.4147°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Maitum, Philippines?
The magnitude 4.2 earthquake that struck 287 km SSW of Maitum, Philippines on August 20, 2021 at 22:21 UTC had a depth of 465.4 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 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000f6bi). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, August 20, 2021). M4.2 Earthquake 287 km SSW of Maitum, Philippines — August 20, 2021. Retrieved November 2, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000f6bi/