August 19- One of Russia’s most active volcanoes has erupted, spewing plumes of ash 5km (3 miles) into the sky over the far eastern Kamchatka Peninsula and briefly triggering a “code red” warning for aircraft.

The Shiveluch volcano began sputtering shortly after a powerful 7.0 magnitude earthquake struck off Kamchatka’s east coast early on Sunday, according to volcanologists from the Russian Academy of Sciences. They warned that another, even more potent earthquake, could be on the way.

The academy’s Institute of Volcanology and Seismology released a video showing the ash cloud over Shiveluch. It stretched more than 490km (304 miles) east and southeast of the volcano.

The Ebeko volcano located on the Kuril Islands also spewed ash 2.5km (1.5 miles) high, the institute said. It did not explicitly say whether the earthquake set off the eruptions.

A “code red” ash cloud warning briefly put all aircraft in the area on alert, the Kamchatka Volcanic Eruption Response Team reported. A separate report on Sunday carried by the official TASS news agency said that no commercial flights had been disrupted and there was no damage to aviation infrastructure.