M4.6 Earthquake 36 km S of Inarajan Village, Guam — October 18, 2026
2026-10-18 17:28:46 UTC (5 days ago) · approx. 3:28 AM UTC+10 local
On October 18, 2026 at 17:28 UTC, a magnitude 4.6 shallow crustal earthquake struck 36 km S of Inarajan Village, Guam, at a depth of 44.4 km and coordinates 12.9409°, 144.7428°. This earthquake was detected by 33 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 326, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
144.7428°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.6 earthquake near Inarajan Village, Guam?
The magnitude 4.6 earthquake that struck 36 km S of Inarajan Village, Guam on October 18, 2026 at 17:28 UTC had a depth of 44.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 12.9409°, 144.7428°, which is 36 km S of Inarajan Village, Guam.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000u4b2). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, October 18, 2026). M4.6 Earthquake 36 km S of Inarajan Village, Guam — October 18, 2026. Retrieved October 23, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000u4b2/