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Italy’s Mount Etna produced a spectacularly explosive eruption Monday morning, sending a ripple of reddish clouds down from its summit. The soaring ash rose to form a mushroom cloud high above Etna, 

, triggering a red alert for aviation crews in the region.

The National Institute of Geophysics and Volcanology's Etna Observatory in Catania estimated the volcanic cloud's height at about 21,325 feet. The massive ash cloud was moving in a west-southwest direction, according to the agency, known as INGV.

The dramatic scene at Etna's southeast crater was caught on multiple webcams, spreading quickly across social media. As seen in a 

, the eruption rapidly grew from a few lava flows to cascades of boiling ash and smoke that rose into a large cloud.

Thankfully, the eruption doesn't seem to have had any immediate impact on people in the area, other than forcing officials to halt tourists' visits to the volcano, which is a popular destination and is located on the east coast of Sicily. 

Officials believe that a large portion of the crater collapsed, according to the Italian news agency 

 as the INGV said volcanic activity and ash emissions were finally decreasing. With the ash cloud moving toward the west, operations at Vincenzo Bellini Catania Airport, due south of Etna, weren't affected. 

It's not unusual for Etna to emit lava and gases from its summit craters. Etna is "the most active stratovolcano in the world that has continuously pumped ash and lava" for thousands of years, according to 

. (A stratovolcano, also known as a composite volcano, is often steep and conical, according to the 

, like Hawaii's Mauna Loa, are larger but with a more gradual slope.)

Etna has a long history of frequent eruptions, 

 — ejections of cinder, gas and molten lava that result from repeated, but relatively small, explosions.

"The Strombolian activity generally affects a limited area around the vent and is not an agent of risk [to] built up areas" around Etna, according to Italy's 

. Etna's lava flows are also normally viscous and slow-moving, often allowing authorities to intervene to redirect flows that threaten communities.

Etna's eruptions have produced striking scenes over the years, from a 

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Bill Chappell

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Mount Etna produced a spectacularly explosive eruption Monday, sending a ripple of reddish clouds down from the southeast summit of Europe’s highest active volcano.

Mount Etna erupts, shooting a massive ash cloud into the sky and raising alerts

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