M4.6 Earthquake 77 km NNE of Yigo Village, Guam — January 29, 2021
2021-01-29 22:33:50 UTC (2021-01-29) · approx. 8:33 AM UTC+10 local
Felt by 6 people across nearby locations. Aftershock of the M5.1 mainshock.
On January 29, 2021 at 22:33 UTC, a magnitude 4.6 intermediate depth earthquake struck 77 km NNE of Yigo Village, Guam, at a depth of 108.2 km and coordinates 14.1763°, 145.1727°.
Physical scale: An earthquake of magnitude 4.6 releases seismic energy equivalent to roughly 120 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 899 m — a useful intuition for the size of the slip patch on the fault.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.1 mainshock that occurred 15 days ago 80 km SSW of San Jose Village, Northern Mariana Islands. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 6 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
145.1727°E
Technical Information
Common Questions
How strong was the magnitude 4.6 earthquake near Yigo Village, Guam?
The magnitude 4.6 earthquake that struck 77 km NNE of Yigo Village, Guam on January 29, 2021 at 22:33 UTC had a depth of 108.2 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 14.1763°, 145.1727°, which is 77 km NNE of Yigo Village, Guam.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.6 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.1 one earlier?
No. This magnitude 4.6 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier 80 km SSW of San Jose Village, Northern Mariana Islands. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
Actions
Authoritative source: USGS event page (event ID: us6000dd3m). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, January 29, 2021). M4.6 Earthquake 77 km NNE of Yigo Village, Guam — January 29, 2021. Retrieved April 16, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000dd3m/