M4.5 Earthquake 91 km E of Namie, Japan — July 20, 2022
2022-07-20 23:50:31 UTC (2022-07-20) · approx. 8:50 AM UTC+9 local
Felt by 1 person across nearby locations.
On July 20, 2022 at 23:50 UTC, a magnitude 4.5 shallow crustal earthquake struck 91 km E of Namie, Japan, at a depth of 36.6 km and coordinates 37.5165°, 142.0377°. This earthquake was detected by 82 seismic stations with good location accuracy and was assigned a USGS significance rating of 312, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.5 releases seismic energy equivalent to roughly 85 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 767 m — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Japan, a region characterized by the intersection of four tectonic plates — Pacific, Philippine Sea, Eurasian, and North American — creating multiple subduction zones. The nearest mapped fault system is the Japan Trench. View all earthquakes in Japan.
Learn more: Magnitude scale · Aftershock sequences
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
142.0377°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.5 earthquake near Namie, Japan?
The magnitude 4.5 earthquake that struck 91 km E of Namie, Japan on July 20, 2022 at 23:50 UTC had a depth of 36.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 37.5165°, 142.0377°, which is 91 km E of Namie, Japan. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.5 earthquakes can continue for several days and gradually diminish over time.
Has Japan had earthquakes this big before?
The largest recorded earthquake in Japan was the M9.1 Tohoku earthquake of March 11, 2011. Today's magnitude 4.5 event is significantly smaller than that historical record.
Actions
Location
Authoritative source: USGS event page (event ID: us7000hs9t). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2022, July 20, 2022). M4.5 Earthquake 91 km E of Namie, Japan — July 20, 2022. Retrieved September 27, 2022 from https://www.earthquaketracker.org/earthquakes/event/us7000hs9t/