mmmmm
This quake was likely an aftershock of the 7.6 quake Aomori, 327 km north of Sendai, Miyagi, Japan, Dec 8, 2025 11:15 pm (GMT +9), which had occurred 8 hours earlier.

A very strong magnitude 6.6 earthquake occurred in the North Pacific Ocean 103 km (64 mi) from Hokkaido, Japan, in the early morning of Tuesday, Dec 9, 2025 at 6.52 am local time (GMT +9).

The quake had a very shallow depth of 19 km (12 mi) and was felt by many near the epicenter.

The shallow depth of the quake caused it to be felt more strongly near the epicenter than a deeper quake of similar magnitude would.