M4.1 Earthquake 4 km WNW of Iwamizawa, Japan — November 14, 2021
2021-11-14 23:19:06 UTC (2021-11-14) · approx. 8:19 AM UTC+9 local
On November 14, 2021 at 23:19 UTC, a magnitude 4.1 intermediate depth earthquake struck 4 km WNW of Iwamizawa, Japan, at a depth of 170.0 km and coordinates 43.2078°, 141.7099°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
141.7099°E
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Common Questions
How strong was the magnitude 4.1 earthquake near Iwamizawa, Japan?
The magnitude 4.1 earthquake that struck 4 km WNW of Iwamizawa, Japan on November 14, 2021 at 23:19 UTC had a depth of 170.0 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 4.1 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000fu4s). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2021, November 14, 2021). M4.1 Earthquake 4 km WNW of Iwamizawa, Japan — November 14, 2021. Retrieved January 22, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000fu4s/