M4.2 Earthquake 98 km ESE of Yamada, Japan — December 1, 2021
2021-12-01 17:40:49 UTC (2021-12-01) · approx. 3:40 AM UTC+10 local
On December 1, 2021 at 17:40 UTC, a magnitude 4.2 shallow crustal earthquake struck 98 km ESE of Yamada, Japan, at a depth of 35.0 km and coordinates 39.2602°, 143.0663°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
143.0663°E
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Common Questions
How strong was the magnitude 4.2 earthquake near Yamada, Japan?
The magnitude 4.2 earthquake that struck 98 km ESE of Yamada, Japan on December 1, 2021 at 17:40 UTC had a depth of 35.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000ga1a). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, December 1, 2021). M4.2 Earthquake 98 km ESE of Yamada, Japan — December 1, 2021. Retrieved February 5, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000ga1a/