M4.2 Earthquake 235 km SSE of Tateyama, Japan — September 12, 2020
2020-09-12 23:42:29 UTC (2020-09-12) · approx. 8:42 AM UTC+9 local
On September 12, 2020 at 23:42 UTC, a magnitude 4.2 shallow crustal earthquake struck 235 km SSE of Tateyama, Japan, at a depth of 62.3 km and coordinates 32.9611°, 140.6504°.
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
140.6504°E
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Common Questions
How strong was the magnitude 4.2 earthquake near Tateyama, Japan?
The magnitude 4.2 earthquake that struck 235 km SSE of Tateyama, Japan on September 12, 2020 at 23:42 UTC had a depth of 62.3 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: us7000bpe1). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2020, September 12, 2020). M4.2 Earthquake 235 km SSE of Tateyama, Japan — September 12, 2020. Retrieved November 21, 2020 from https://www.earthquaketracker.org/earthquakes/event/us7000bpe1/