M4.5 Earthquake 131 km SSW of Colonia, Micronesia — September 15, 2021
2021-09-15 20:46:53 UTC (2021-09-15) · approx. 5:46 AM UTC+9 local
On September 15, 2021 at 20:46 UTC, a magnitude 4.5 shallow crustal earthquake struck 131 km SSW of Colonia, Micronesia, at a depth of 10.0 km and coordinates 8.3812°, 137.7523°.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
137.7523°E
Technical Information
Common Questions
How strong was the magnitude 4.5 earthquake near Colonia, Micronesia?
The magnitude 4.5 earthquake that struck 131 km SSW of Colonia, Micronesia on September 15, 2021 at 20:46 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 8.3812°, 137.7523°, which is 131 km SSW of Colonia, Micronesia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us7000fd6q). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, September 15, 2021). M4.5 Earthquake 131 km SSW of Colonia, Micronesia — September 15, 2021. Retrieved November 23, 2021 from https://www.earthquaketracker.org/earthquakes/event/us7000fd6q/