Moscow, July 30 -- A powerful earthquake of magnitude 8.8 on Wednesday morning rattled across Petropavlovsk-Kamchatsky, triggering widespread tsunami warnings across the Pacific.

As per the United States Geological Survey (USGS), the earthquake occurred at a shallow depth of 20.7km, making it susceptible to aftershocks.

Another earthquake of the same magnitude followed soon after.

"Notable quake, preliminary info: M 8.0 - 136 km ESE of Petropavlovsk-Kamchatsky, Russia," USGS stated.

Two aftershocks followed, one of magnitude 6.9 and 6.3 on the Richter Scale.

"Notable quake, preliminary info: M 6.9 - 147 km SE of Petropavlovsk-Kamchatsky, Russia," the USGS noted.

"Notable quake, preliminary info: M 6.3 - 131 km SE of Vilyuchinsk, Rus...