M4.7 Earthquake 73 km NNW of Phôngsali, Laos — December 31, 2021
2021-12-31 14:53:02 UTC (2021-12-31) · approx. 9:53 PM UTC+7 local
On December 31, 2021 at 14:53 UTC, a magnitude 4.7 shallow crustal earthquake struck 73 km NNW of Phôngsali, Laos, at a depth of 10.4 km and coordinates 22.2399°, 101.7118°.
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
101.7118°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.7 earthquake near Phôngsali, Laos?
The magnitude 4.7 earthquake that struck 73 km NNW of Phôngsali, Laos on December 31, 2021 at 14:53 UTC had a depth of 10.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 22.2399°, 101.7118°, which is 73 km NNW of Phôngsali, Laos.
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: us7000g86b). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 31, 2021). M4.7 Earthquake 73 km NNW of Phôngsali, Laos — December 31, 2021. Retrieved March 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000g86b/