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 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 touched 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 no commercial flights had been disrupted and there was no damage to aviation infrastructure.
The tremors in the area may be a prelude to an even stronger earthquake in southeastern Kamchatka, Russian scientists warned. The Institute of Volcanology and Seismology said a potential second earthquake could come “within 24 hours” with a magnitude approaching 9.0.
Russian news outlets cited residents of Petropavlovsk-Kamchatsky, a port city of more than 181,000 people that sits across a bay from an important Russian submarine base, reporting some of the strongest shaking “in a long time”.
On November 4, 1952, a magnitude 9.0 earthquake in Kamchatka caused damage but no reported deaths despite setting off 9.1-metre (30ft) waves in Hawaii.