M5.1 Earthquake in the Mariana Islands region — April 11, 2021
2021-04-11 18:57:59 UTC (2021-04-11) · approx. 4:57 AM UTC+10 local
On April 11, 2021 at 18:57 UTC, a magnitude 5.1 shallow crustal earthquake struck in the Mariana Islands region, at a depth of 14.4 km and coordinates 18.0130°, 147.1488°.
Physical scale: An earthquake of magnitude 5.1 releases seismic energy equivalent to roughly 674 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.0 km — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
147.1488°E
Technical Information
Common Questions
How strong was the magnitude 5.1 earthquake in the Mariana Islands region?
The magnitude 5.1 earthquake that struck in the Mariana Islands region on April 11, 2021 at 18:57 UTC had a depth of 14.4 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 18.0130°, 147.1488°, which is in the Mariana Islands region.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.1 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000e0vk). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, April 11, 2021). M5.1 Earthquake in the Mariana Islands region — April 11, 2021. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000e0vk/