A preliminary magnitude 6.1 earthquake struck northern Japan early Monday, according to the U.S. Geological Survey, with no immediate reports of fatalities or structural damage.

The quake occurred approximately 18 kilometers (11 miles) west of the town of Sarabetsu in Hokkaido. The USGS reported the earthquake had a depth of about 81 kilometers (50 miles), which can often lessen surface-level impact compared to shallower quakes.

Japan, located along the seismically active Pacific Ring of Fire, regularly experiences earthquakes of varying intensity. While Monday’s tremor did not appear to cause significant disruption, it came just one week after a much stronger magnitude 7.7 earthquake struck off the northern coast.

That earlier quake prompted a temporary tsunami alert and led authorities to issue an advisory warning of an increased risk of a potential megaquake along coastal areas. The alert was later lifted, and no major damage was reported from that event.

Officials continue to monitor seismic activity in the region as Japan maintains strict building codes and preparedness measures designed to minimize the impact of earthquakes.