M4.2 Earthquake 85 km ESE of Hiroo, Japan — April 18, 2025
2025-04-18 21:08:54 UTC (2025-04-18) · approx. 7:08 AM UTC+10 local
On April 18, 2025 at 21:08 UTC, a magnitude 4.2 shallow crustal earthquake struck 85 km ESE of Hiroo, Japan, at a depth of 41.6 km and coordinates 41.9349°, 144.2246°.
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.
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
144.2246°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Hiroo, Japan?
The magnitude 4.2 earthquake that struck 85 km ESE of Hiroo, Japan on April 18, 2025 at 21:08 UTC had a depth of 41.6 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 4.2 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: us6000q73j). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, April 18, 2025). M4.2 Earthquake 85 km ESE of Hiroo, Japan — April 18, 2025. Retrieved June 27, 2025 from https://www.earthquaketracker.org/earthquakes/event/us6000q73j/