M4.4 Earthquake 1 km WSW of Minalabac, Philippines — October 22, 2021
2021-10-22 19:44:53 UTC (2021-10-22) · approx. 3:44 AM UTC+8 local
On October 22, 2021 at 19:44 UTC, a magnitude 4.4 shallow crustal earthquake struck 1 km WSW of Minalabac, Philippines, at a depth of 40.6 km and coordinates 13.5648°, 123.1742°.
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
123.1742°E
Technical Information
Common Questions
How strong was the magnitude 4.4 earthquake near Minalabac, Philippines?
The magnitude 4.4 earthquake that struck 1 km WSW of Minalabac, Philippines on October 22, 2021 at 19:44 UTC had a depth of 40.6 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 4.4 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: us7000fpfu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, October 22, 2021). M4.4 Earthquake 1 km WSW of Minalabac, Philippines — October 22, 2021. Retrieved January 8, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000fpfu/