Shallow M5.8 earthquake hits Chiba Prefecture, Japan
A shallow M5.8 earthquake was recorded at 03:46 UTC on June 26, 2026, 4 km (2 miles) south-southeast of Yokoshiba, Japan, at a depth of 55.6 km (34.6 miles).
The coordinates place the epicenter at 140.5°E, 35.6°N, within the inland area of Chiba Prefecture on Honshu, Japan. Yokoshiba is a town in a region marked by mixed rural and urban settings within proximity to the eastern Pacific coast.
Chiba Prefecture incorporates several major transit routes, railways, highways, and is within reach of the Tokyo metropolitan network. Utilities, residential areas, and transport infrastructure are present in the surrounding region.
There is no tsunami threat associated with this earthquake, based on its location and available data.
USGS issued a green alert for this event, indicating a low likelihood of casualties or damage. The maximum estimated intensity was IV. There were 13 felt reports submitted. The significance index is 524 (on a scale that runs through 1 000), based on magnitude, felt reports, and estimated impact.
Japan is situated along the convergent boundary of the Pacific and Philippine Sea plates, making it one of the most seismically active regions in the world.
This information was last updated at 04:14 UTC on June 26, 2026.