M4.1 Earthquake 16 km WSW of Boston, Philippines — April 25, 2021
2021-04-25 21:21:16 UTC (2021-04-25) · approx. 5:21 AM UTC+8 local
On April 25, 2021 at 21:21 UTC, a magnitude 4.1 intermediate depth earthquake struck 16 km WSW of Boston, Philippines, at a depth of 109.6 km and coordinates 7.8276°, 126.2242°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
126.2242°E
Technical Information
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Common Questions
How strong was the magnitude 4.1 earthquake near Boston, Philippines?
The magnitude 4.1 earthquake that struck 16 km WSW of Boston, Philippines on April 25, 2021 at 21:21 UTC had a depth of 109.6 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000e4r9). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 25, 2021). M4.1 Earthquake 16 km WSW of Boston, Philippines — April 25, 2021. Retrieved July 7, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000e4r9/