M4.7 Earthquake in the Guam region — August 23, 2023
2023-08-23 06:43:15 UTC (2023-08-23) · approx. 4:43 PM UTC+10 local
Felt by 1 person across nearby locations.
On August 23, 2023 at 06:43 UTC, a magnitude 4.7 shallow crustal earthquake struck in the Guam region, at a depth of 41.6 km and coordinates 12.3973°, 144.1748°. This earthquake was detected by 59 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 340, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.7 releases seismic energy equivalent to roughly 169 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.1 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 1 citizen response 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
144.1748°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.7 earthquake in the Guam region?
The magnitude 4.7 earthquake that struck in the Guam region on August 23, 2023 at 06:43 UTC had a depth of 41.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 12.3973°, 144.1748°, which is in the Guam region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.7 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000kq9v). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, August 23, 2023). M4.7 Earthquake in the Guam region — August 23, 2023. Retrieved October 28, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000kq9v/