M4.3 Earthquake 30 km SE of Kamaishi, Japan — June 20, 2023
2023-06-20 21:22:00 UTC (2023-06-20) · approx. 6:22 AM UTC+9 local
On June 20, 2023 at 21:22 UTC, a magnitude 4.3 shallow crustal earthquake struck 30 km SE of Kamaishi, Japan, at a depth of 50.4 km and coordinates 39.1237°, 142.1614°.
Physical scale: An earthquake of magnitude 4.3 releases seismic energy equivalent to roughly 43 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 558 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
142.1614°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Kamaishi, Japan?
The magnitude 4.3 earthquake that struck 30 km SE of Kamaishi, Japan on June 20, 2023 at 21:22 UTC had a depth of 50.4 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 4.3 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 4.3 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000knp1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, June 20, 2023). M4.3 Earthquake 30 km SE of Kamaishi, Japan — June 20, 2023. Retrieved August 26, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000knp1/