M4.9 Earthquake near ~120km W of Hanoi, Vietnam — July 27, 2020
2020-07-27 05:14:50 UTC (2020-07-27) · approx. 12:14 PM UTC+7 local
Felt by 25 people across nearby locations. Maximum shaking intensity MMI 5.6 (strong).
On July 27, 2020 at 05:14 UTC, a magnitude 4.9 shallow crustal earthquake struck near ~120km W of Hanoi, Vietnam, at a depth of 10.0 km and coordinates 20.8627°, 104.6240°. The earthquake was reported felt by 25 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 5.6 (strong).
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 25 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
104.6240°E
Technical Information
Common Questions
How strong was the magnitude 4.9 earthquake near ~120km W of Hanoi, Vietnam?
The magnitude 4.9 earthquake that struck near ~120km W of Hanoi, Vietnam on July 27, 2020 at 05:14 UTC had a depth of 10.0 km. It was felt by 25 people with maximum shaking intensity of MMI 5.6 (strong). For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 20.8627°, 104.6240°, which is near ~120km W of Hanoi, Vietnam.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us6000b4kv). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, July 27, 2020). M4.9 Earthquake near ~120km W of Hanoi, Vietnam — July 27, 2020. Retrieved December 22, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000b4kv/