M4.9 Earthquake in the Bonin Islands, Japan region — March 29, 2023
2023-03-29 21:44:11 UTC (2023-03-29) · approx. 6:44 AM UTC+9 local
On March 29, 2023 at 21:44 UTC, a magnitude 4.9 shallow crustal earthquake struck in the Bonin Islands, Japan region, at a depth of 58.6 km and coordinates 28.2988°, 141.4790°. This earthquake was detected by 171 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — 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
Earthquake Details
141.4790°E
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Common Questions
How strong was the magnitude 4.9 earthquake in the Bonin Islands, Japan region?
The magnitude 4.9 earthquake that struck in the Bonin Islands, Japan region on March 29, 2023 at 21:44 UTC had a depth of 58.6 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at 28.2988°, 141.4790°, which is in the Bonin Islands, Japan region. View all earthquakes in Japan.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 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 4.9 event is significantly smaller than that historical record.
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Location
Authoritative source: USGS event page (event ID: us6000k0rg). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, March 29, 2023). M4.9 Earthquake in the Bonin Islands, Japan region — March 29, 2023. Retrieved June 3, 2023 from https://www.earthquaketracker.org/earthquakes/event/us6000k0rg/