M5.2 Earthquake in the Alamagan region, Northern Mariana Islands — October 20, 2020
2020-10-20 13:20:02 UTC (2020-10-20) · approx. 11:20 PM UTC+10 local
Felt by 1 person across nearby locations.
On October 20, 2020 at 13:20 UTC, a magnitude 5.2 intermediate depth earthquake struck in the Alamagan region, Northern Mariana Islands, at a depth of 99.6 km and coordinates 17.9617°, 146.2487°.
Physical scale: An earthquake of magnitude 5.2 releases seismic energy equivalent to roughly 951 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.3 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
146.2487°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 5.2 earthquake in the Alamagan region, Northern Mariana Islands?
The magnitude 5.2 earthquake that struck in the Alamagan region, Northern Mariana Islands on October 20, 2020 at 13:20 UTC had a depth of 99.6 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 17.9617°, 146.2487°, which is in the Alamagan region, Northern Mariana Islands.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.2 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000ca0c). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, October 20, 2020). M5.2 Earthquake in the Alamagan region, Northern Mariana Islands — October 20, 2020. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000ca0c/