M4.3 Earthquake 30 km SE of Koshima, Japan — December 26, 2020
2020-12-26 20:56:27 UTC (2020-12-26) · approx. 5:56 AM UTC+9 local
On December 26, 2020 at 20:56 UTC, a magnitude 4.3 shallow crustal earthquake struck 30 km SE of Koshima, Japan, at a depth of 56.2 km and coordinates 30.0329°, 130.7463°.
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
130.7463°E
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Common Questions
How strong was the magnitude 4.3 earthquake near Koshima, Japan?
The magnitude 4.3 earthquake that struck 30 km SE of Koshima, Japan on December 26, 2020 at 20:56 UTC had a depth of 56.2 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 4.3 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: us6000d65g). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, December 26, 2020). M4.3 Earthquake 30 km SE of Koshima, Japan — December 26, 2020. Retrieved March 6, 2021 from https://www.earthquaketracker.org/earthquakes/event/us6000d65g/