M4.4 Earthquake 47 km E of Ōarai, Japan — April 30, 2023
2023-04-30 23:51:02 UTC (2023-04-30) · approx. 8:51 AM UTC+9 local
On April 30, 2023 at 23:51 UTC, a magnitude 4.4 shallow crustal earthquake struck 47 km E of Ōarai, Japan, at a depth of 39.4 km and coordinates 36.2566°, 141.1086°.
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.
Earthquake Details
141.1086°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.4 earthquake near Ōarai, Japan?
The magnitude 4.4 earthquake that struck 47 km E of Ōarai, Japan on April 30, 2023 at 23:51 UTC had a depth of 39.4 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.
Actions
Location
Understanding This Data
Magnitude 4.4 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000jxa1). 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 47 km E of Ōarai, Japan — April 30, 2023. Retrieved July 15, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000jxa1/