M3.9 Earthquake 10 km NE of Akkeshi, Japan — October 23, 2023
2023-10-23 20:05:46 UTC (2023-10-23) · approx. 6:05 AM UTC+10 local
On October 23, 2023 at 20:05 UTC, a magnitude 3.9 intermediate depth earthquake struck 10 km NE of Akkeshi, Japan, at a depth of 109.1 km and coordinates 43.1112°, 144.9238°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response 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
144.9238°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Akkeshi, Japan?
The magnitude 3.9 earthquake that struck 10 km NE of Akkeshi, Japan on October 23, 2023 at 20:05 UTC had a depth of 109.1 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000l5ug). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 23, 2023). M3.9 Earthquake 10 km NE of Akkeshi, Japan — October 23, 2023. Retrieved January 4, 2024 from https://www.earthquaketracker.org/earthquakes/event/us7000l5ug/