M4.1 Earthquake in the Izu Islands, Japan region — May 18, 2026
2026-05-18 07:34:13 UTC (2 days ago) · approx. 4:34 PM UTC+9 local
On May 18, 2026 at 07:34 UTC, a magnitude 4.1 deep-focus earthquake struck in the Izu Islands, Japan region, at a depth of 443.7 km and coordinates 30.1658°, 138.6362°.
Physical scale: An earthquake of magnitude 4.1 releases seismic energy equivalent to roughly 21 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 406 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 5.1 mainshock that occurred 7 days ago in the Izu Islands, Japan region. 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
138.6362°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.1 earthquake in the Izu Islands, Japan region?
The magnitude 4.1 earthquake that struck in the Izu Islands, Japan region on May 18, 2026 at 07:34 UTC had a depth of 443.7 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 4.1 earthquakes can continue for several days and gradually diminish over time.
Is this the same earthquake as the M5.1 one earlier?
No. This magnitude 4.1 earthquake is an aftershock of the larger magnitude 5.1 mainshock that occurred earlier in the Izu Islands, Japan region. Aftershocks are smaller earthquakes triggered by stress changes from the mainshock.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
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Understanding This Data
Magnitude 4.1 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us6000syh8). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, May 18, 2026). M4.1 Earthquake in the Izu Islands, Japan region — May 18, 2026. Retrieved May 20, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000syh8/