M4.7 Earthquake 154 km SSW of Colonia, Micronesia — October 20, 2023
2023-10-20 13:24:08 UTC (2023-10-20) · approx. 10:24 PM UTC+9 local
On October 20, 2023 at 13:24 UTC, a magnitude 4.7 shallow crustal earthquake struck 154 km SSW of Colonia, Micronesia, at a depth of 10.0 km and coordinates 8.2370°, 137.5492°. This earthquake was detected by 41 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.
Earthquake Details
137.5492°E
Technical Information
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Common Questions
How strong was the magnitude 4.7 earthquake near Colonia, Micronesia?
The magnitude 4.7 earthquake that struck 154 km SSW of Colonia, Micronesia on October 20, 2023 at 13:24 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 8.2370°, 137.5492°, which is 154 km SSW of Colonia, Micronesia.
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: us7000l67e). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 20, 2023). M4.7 Earthquake 154 km SSW of Colonia, Micronesia — October 20, 2023. Retrieved December 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000l67e/