M4.2 Earthquake 117 km SW of Ishigaki, Japan — July 31, 2022
2022-07-31 18:54:25 UTC (2022-07-31) · approx. 2:54 AM UTC+8 local
On July 31, 2022 at 18:54 UTC, a magnitude 4.2 shallow crustal earthquake struck 117 km SW of Ishigaki, Japan, at a depth of 35.0 km and coordinates 23.4918°, 123.4735°.
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.
Earthquake Details
123.4735°E
Technical Information
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Common Questions
How strong was the magnitude 4.2 earthquake near Ishigaki, Japan?
The magnitude 4.2 earthquake that struck 117 km SW of Ishigaki, Japan on July 31, 2022 at 18:54 UTC had a depth of 35.0 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: us6000i9q7). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, July 31, 2022). M4.2 Earthquake 117 km SW of Ishigaki, Japan — July 31, 2022. Retrieved October 12, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000i9q7/