M4.4 Earthquake near near the east coast of Honshu, Japan — April 30, 2023
2023-04-30 20:04:22 UTC (2023-04-30) · approx. 5:04 AM UTC+9 local
On April 30, 2023 at 20:04 UTC, a magnitude 4.4 intermediate depth earthquake struck near near the east coast of Honshu, Japan, at a depth of 70.6 km and coordinates 36.4188°, 140.6219°.
Physical scale: An earthquake of magnitude 4.4 releases seismic energy equivalent to roughly 60 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 655 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 9 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
140.6219°E
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Common Questions
How strong was the magnitude 4.4 earthquake near near the east coast of Honshu, Japan?
The magnitude 4.4 earthquake that struck near near the east coast of Honshu, Japan on April 30, 2023 at 20:04 UTC had a depth of 70.6 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 4.4 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000jx8m). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, April 30, 2023). M4.4 Earthquake near near the east coast of Honshu, Japan — April 30, 2023. Retrieved September 13, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000jx8m/