Weird History

What If Mount Vesuvius Erupted Again? 

Zach Seemayer
Updated August 14, 2019 68.8k views 14 items

Looming over Naples, Italy, Mount Vesuvius is a monument to its own destructive past. It's also a sleeping giant that threatens the lives of hundreds of thousands of people who live and work around its base. When the volcano famously erupted in 79 CE, it utterly wiped out the towns of Pompeii and Herculaneum - as well as the populations that lived there. Writing about the event with both awe and horror, Pliny the Younger gave history the first-ever eye-witness account of a volcanic eruption.

Since 79 CE, the volcano has erupted 30 times. The most notable of these later eruptions occurred in 1631 and may have resulted in as many as 6,000 casualties. The most recent was in 1944, when Vesuvius launched debris into the air and claimed the lives of 26 people. However, none of those quakes came close to the power of the famous eruption, or the apocalyptic eruptions of the distant past.

The truly frightening thing about Vesuvius is that, based on geological research, it has reached its due date. When the volcano finally erupts, it may blow with the force of several hundred atomic detonations. So, what if Vesuvius erupted today? Here's a look at what that would mean for the people of Naples, Europe, and the world as a whole.

The Italian Government Would Implement Its Evacuation Plan
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If Mount Vesuvius rumbles to life once again, the Italian government - as well as the local governments in the Campania region - will put a plan into action that, in theory, could protect the residents of the towns and villages surrounding the volcano. The plan calls for the deployment of 500 buses and 220 trains to transport residents out of the major cities, and would require clockwork precision and flawless coordination among all local governments and regional directors.

This level of coordination is a concern to Francesco Peduto, the president of Italy's National Council of Geology. He told The Independent, "Those who would have to put this plan into action - that is, the local civil protection from the different towns involved - don’t study and may not be in a position to put it into action."

Without the plan, hundreds of thousands of people would be in jeopardy. The so-called "red zone" around Vesuvius, the region where devastation is unavoidable in an eruption, encompasses 25 towns and over 670,000 people. The less-impacted "yellow zone" accounts for an additional 63 towns and municipalities. Though farther away, this area would still be at risk from falling debris and ash.

Thousands Of Homes Built On The Slopes Of The Volcano Would Be Lost
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Photo:  Pastorius/Wikimedia Commons/CC BY-SA 3.0

Not only have cities, towns, and small clusters of homes been built around the base of Vesuvius, thousands of structures have been built on the slopes of the volcano itself. To discourage people from living in such a dangerous area, the government has torn down these dwellings and set up a relocation fund to assist families to move out of the "red zone." This fund has largely failed to gain traction among residents, who like where they live.

To further restrict people from purchasing land or building on the uppermost part of the volcano, the government officially designated 25,000 acres of the volcano a national park in 1995. Despite the dire warnings from officials, some 8,000 illegal structures have been found within the confines of the national park - including everything from homes to stores to restaurants.

Efforts to tear these structures down have been met with stubborn resistance from many in the area who have no interest in leaving Vesuvius, even for their own protection. If the volcano erupted to its full potential, these structures would likely end up buried in magma and pyroclastic flow.

People Who Live In The 'Red Zone' Are Supposed To Find Refuge In Their Sister Cities
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If the evacuation plan is put into place, it would take two weeks to successfully evacuate the over 600,000 people living in the "red zones" around Vesuvius, according to Marco Di Lello, director of urban planning for the Campania region. This is one reason the government has been trying to encourage people to move to other areas. If the population decreased to 400,000, Di Lello says the evacuation would only take eight days. That still leaves the question: where would everyone go?

Di Lello says plans have been put into place to evacuate residents into neighboring cities and designated sister cities in Italy. The hundreds of thousands of residents forced to flee would likely have to live as refugees in these cities, which would struggle to develop the infrastructure to house them for a period of time. Considering the risk to structures in the "red zones," the relocation could swiftly become permanent.

In addition to using buses and trains to evacuate residents, it was decided that people living in the "red zones" - especially on the coast - would also be boarded onto boats. The evacuees would then be taken, temporarily, to the Italian island of Sardinia. "We will start a detailed census of our population first and then discuss in which town in Sardinia our citizens will be transferred, hoping that this day will never come," explained Pietro Amitrano, the mayor of Pompeii, in 2018.

The Evacuation Plan May Not Be Implemented
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There is a chance that, fearing a false alarm, those in charge of implementing the evacuation won't do it. There are many precursors to a volcanic eruption, including bradyseism activity (in which the ground swells due to magma filling underground chambers), geothermal activity, and tremors. All are legitimate warning signs of imminent eruption and could justify evacuation protocols.

This was the case in 1984 when, following several seismic events in the nearby Campi Flegrei caldera (which, like Vesuvius, is part of the Campanian volcanic arc), officials evacuated 40,000 residents. However, no eruption occurred.

Despite the "no eruption" scenario being better than the alternative, the disruption and chaos caused by the mandatory evacuation of hundreds of thousands of people for a false alarm could be very damaging to an official's public perception and popularity. "Imagine evacuating 580,000 people and nothing happens," Giovanni Macedonio, research director of Vesuvius Observatory, told USA Today. "Get it wrong, and it's the end of a career."

Fearing for their reputations, civic leaders could delay an evacuation until it's too late.