M6.1 earthquake – Nemuro, Japan

An M6.1 earthquake was recorded at 21:23 UTC on June 21, 2025, about 88 km (55 miles) east-southeast of Nemuro, Japan, at a depth of 10.0 km (6.2 miles).

The earthquake’s epicenter was located at coordinates 146.5°E, 42.9°N, offshore near the eastern coast of Hokkaido in the northwest Pacific. Nemuro is the closest major locality, situated on the eastern tip of Hokkaido Island.

Given the offshore location, the region is served by critical infrastructures such as commercial fisheries, local ports, and coastal transport links that are vital for the area.

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 reached IV (four) on the Modified Mercalli Intensity scale. The significance index is 572 (on a scale that runs through 1 000), based on magnitude, felt reports, and estimated impact.

Hokkaido lies along the boundary of the Pacific and North American tectonic plates, part of the seismically active Kuril–Kamchatka subduction zone, an area known for frequent significant earthquakes.

This information was last updated at 21:50 UTC on June 21, 2025.

Source: https://earthquake.usgs.gov/earthquakes/eventpage/us6000qlnz