On December 28, a 6.5-magnitude earthquake occurred in Kuril'sk, Russia, as reported by the United States Geological Survey (USGS).
The earthquake's epicenter was situated at a depth of 23.8 kilometers (14.8 miles) in Kuril'sk.
Approximately 30 minutes later, a 4.7-magnitude earthquake was reported in Russia, believed to be an aftershock of the initial quake.
Three individuals claimed to have felt the earthquake during the USGS' preliminary report on Thursday.
The European-Mediterranean Seismological Centre stated that there was no expected threat of a tsunami related to the earthquake.
The Crisis24 Risk Management Platform suggested that "moderate shaking" may have occurred in parts of the southern Kuril Islands and far northeastern areas of Sapporo, Japan.
Despite the earthquake, there were no initial reports of damage or casualties, but the Crisis24 platform noted that some damage could be possible in areas near the epicenter.
The earthquake did not prompt any tsunami advisories, and authorities may take several hours to conduct comprehensive damage assessments, especially in remote areas.