M4.2 Earthquake 4 km S of Piti Village, Guam — October 28, 2023
2023-10-28 19:39:36 UTC (2023-10-28) · approx. 5:39 AM UTC+10 local
On October 28, 2023 at 19:39 UTC, a magnitude 4.2 intermediate depth earthquake struck 4 km S of Piti Village, Guam, at a depth of 144.8 km and coordinates 13.4240°, 144.6923°.
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
144.6923°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Piti Village, Guam?
The magnitude 4.2 earthquake that struck 4 km S of Piti Village, Guam on October 28, 2023 at 19:39 UTC had a depth of 144.8 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: us7000l8cj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 28, 2023). M4.2 Earthquake 4 km S of Piti Village, Guam — October 28, 2023. Retrieved January 4, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000l8cj/