M5.2 Earthquake 91 km W of Umatac Village, Guam — August 29, 2023
2023-08-29 10:15:27 UTC (2023-08-29) · approx. 8:15 PM UTC+10 local
Felt by 14 people across nearby locations.
On August 29, 2023 at 10:15 UTC, a magnitude 5.2 intermediate depth earthquake struck 91 km W of Umatac Village, Guam, at a depth of 144.5 km and coordinates 13.1887°, 143.8269°. This earthquake was detected by 183 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 421, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.2 releases seismic energy equivalent to roughly 951 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.3 km — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 14 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
143.8269°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.2 earthquake near Umatac Village, Guam?
The magnitude 5.2 earthquake that struck 91 km W of Umatac Village, Guam on August 29, 2023 at 10:15 UTC had a depth of 144.5 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 13.1887°, 143.8269°, which is 91 km W of Umatac Village, Guam.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.2 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000kruj). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 29, 2023). M5.2 Earthquake 91 km W of Umatac Village, Guam — August 29, 2023. Retrieved August 13, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000kruj/