M4.3 Earthquake 85 km W of Basco, Philippines — March 18, 2021
2021-03-18 21:56:22 UTC (2021-03-18) · approx. 5:56 AM UTC+8 local
On March 18, 2021 at 21:56 UTC, a magnitude 4.3 shallow crustal earthquake struck 85 km W of Basco, Philippines, at a depth of 35.0 km and coordinates 20.5003°, 121.1507°.
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
121.1507°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.3 earthquake near Basco, Philippines?
The magnitude 4.3 earthquake that struck 85 km W of Basco, Philippines on March 18, 2021 at 21:56 UTC had a depth of 35.0 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 4.3 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: us6000dwnq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, March 18, 2021). M4.3 Earthquake 85 km W of Basco, Philippines — March 18, 2021. Retrieved May 26, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000dwnq/