The residents of Petropavlovsk-Kamchatsky city felt underground tremors with a magnitude of up to five, the Kamchatka branch of the Unified Geophysical Service of the Russian Academy of Sciences told TASS, the latter reports.

"Instrumental intensity—up to five. The magnitude is being clarified," the agency said.

According to updated information, the magnitude of the seismic event has amounted to 6.5 with the epicenter 97 kilometers away from Petropavlovsk-Kamchatsky.

A major earthquake had struck off the coast of Kamchatka on the morning of July 30, marking the strongest seismic event in the area since 1952.