M4.4 Earthquake 79 km WSW of San Nicolas, Philippines — July 28, 2021
2021-07-28 20:43:15 UTC (2021-07-28) · approx. 4:43 AM UTC+8 local
On July 28, 2021 at 20:43 UTC, a magnitude 4.4 shallow crustal earthquake struck 79 km WSW of San Nicolas, Philippines, at a depth of 10.0 km and coordinates 14.6155°, 119.4186°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
119.4186°E
Technical Information
Common Questions
How strong was the magnitude 4.4 earthquake near San Nicolas, Philippines?
The magnitude 4.4 earthquake that struck 79 km WSW of San Nicolas, Philippines on July 28, 2021 at 20:43 UTC had a depth of 10.0 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 4.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000f1xq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, July 28, 2021). M4.4 Earthquake 79 km WSW of San Nicolas, Philippines — July 28, 2021. Retrieved October 3, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000f1xq/