M4.9 Earthquake in the Guam region — June 28, 2023
2023-06-28 03:54:04 UTC (2023-06-28) · approx. 1:54 PM UTC+10 local
Felt by 26 people across nearby locations.
On June 28, 2023 at 03:54 UTC, a magnitude 4.9 shallow crustal earthquake struck in the Guam region, at a depth of 54.4 km and coordinates 13.0597°, 144.5925°. This earthquake was detected by 60 seismic stations with good location accuracy and was assigned a USGS significance rating of 379, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 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 26 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
144.5925°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.9 earthquake in the Guam region?
The magnitude 4.9 earthquake that struck in the Guam region on June 28, 2023 at 03:54 UTC had a depth of 54.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 13.0597°, 144.5925°, which is in the Guam region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000knjq). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, June 28, 2023). M4.9 Earthquake in the Guam region — June 28, 2023. Retrieved September 8, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000knjq/