M4.0 Earthquake 140 km NNW of Hirara, Japan — May 29, 2023
2023-05-29 18:59:08 UTC (2023-05-29) · approx. 2:59 AM UTC+8 local
On May 29, 2023 at 18:59 UTC, a magnitude 4.0 intermediate depth earthquake struck 140 km NNW of Hirara, Japan, at a depth of 184.2 km and coordinates 26.0167°, 124.8884°.
Physical scale: An earthquake of magnitude 4.0 releases seismic energy equivalent to roughly 15 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 347 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
124.8884°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near Hirara, Japan?
The magnitude 4.0 earthquake that struck 140 km NNW of Hirara, Japan on May 29, 2023 at 18:59 UTC had a depth of 184.2 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 4.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.0 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000k4tm). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, May 29, 2023). M4.0 Earthquake 140 km NNW of Hirara, Japan — May 29, 2023. Retrieved August 5, 2023 from https://www.earthquaketracker.org/earthquakes/event/us7000k4tm/