M4.0 Earthquake 2 km NNE of ?ami, Japan — July 28, 2022
2022-07-28 21:36:14 UTC (2022-07-28) · approx. 6:36 AM UTC+9 local
On July 28, 2022 at 21:36 UTC, a magnitude 4.0 shallow crustal earthquake struck 2 km NNE of ?ami, Japan, at a depth of 62.6 km and coordinates 35.5418°, 140.3247°.
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.
This earthquake is part of an ongoing aftershock sequence following the magnitude 5.8 mainshock that occurred 18 days ago 2 km NNW of Toride, Japan. Since the mainshock, the USGS has recorded 0 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.
Earthquake Details
140.3247°E
Technical Information
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Common Questions
How strong was the magnitude 4.0 earthquake near ?ami, Japan?
The magnitude 4.0 earthquake that struck 2 km NNE of ?ami, Japan on July 28, 2022 at 21:36 UTC had a depth of 62.6 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.
Is this the same earthquake as the M5.8 one earlier?
No. This magnitude 4.0 earthquake is an aftershock of the larger magnitude 5.8 mainshock that occurred earlier 2 km NNW of Toride, Japan. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
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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: us6000i6bd). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, July 28, 2022). M4.0 Earthquake 2 km NNE of ?ami, Japan — July 28, 2022. Retrieved October 1, 2022 from https://www.earthquaketracker.org/earthquakes/event/us6000i6bd/