TOP 5 OF THE CITIES THAT ARE BUILT ON VOLCANOES.

1. NAPLES (Italy)

The city of Naples is in fact partly built on the caldera formed a long time ago by the collapse of two volcanoes that came together. In Naples, we are most familiar with Vesuvius, the most famous and above all the most visible. The Campi Flegrei lies under the city of Naples and has the particularity of being flat because its magma chamber collapsed 39,000 years ago. When some volcanoes remain inactive, erosion causes them to collapse on themselves. But this does not mean that there is no volcano.

“A 2,000 km circle around Naples would be hit”

What will happen if the Campi Flegrei erupts?

Its power is such that real bombs of fire and molten rock could be projected as far as Barcelona or Paris! Three million people would be directly threatened, since part of Naples is wedged between the sea, Vesuvius and the Campi Flegrei, not to mention the rest of the Mediterranean basin, with its countries in close proximity, such as Corsica. Not to mention the fact that the entire chemical industry of the Neapolitan region is located exactly on the volcanic depression. It is thought that a circle of 2,000 km around Naples would be affected.

2. Auckland (New Zealand)

The Auckland region is the most densely populated volcanic site in the world. Each of the volcanoes there has erupted at least once since Pupuke first appeared about 200,000 years ago.
In April, researchers from the University of Canterbury said that “a volcanic eruption could bring Auckland to its knees, cripple transport networks and displace up to a third of the population”. In March, GNS Science published a report indicating that the next eruption in the region is likely to occur at a volcano that does not yet exist.

3. Aden (Yemen)

The Balhaf-Bir Ali volcanic field along the Gulf of Aden in southern Yemen contains cinder cones associated with vesicular lava flows and scoria cones. The 500 km2 field is located along the Gulf of Aden, about 120 km SW of the city of Al Mukalla. Lava flows covered much of the area and created an irregular coastline. A fresh-looking basaltic flow may be of historic age (Catalogue of active volcanoes of the world). The At-Tabâb tuff cone along the coast rises about 200 m from the sea and has a 1.5 km wide crater partially filled by a cinder cone and associated lava flows. An adjacent tuff cone to the east contains a lake.

4. Cartago (Costa Rica)

Irazú is the highest active stratovolcano in Costa Rica, located in the Cordillera Volcánica Central, inside the national park that bears its name, 32 km north of the city of Cartago. The summit of the volcano has several craters, the main one with a diameter of 1000 m and a depth of 180 m, and its summit has an altitude of 3,432 m above sea level.

Its ashes are capable of ending the socio-economic operations of the region, which depend to a large extent on the international airport (which would be the main one affected), where the main transitions for the sustenance of the national economy are carried out, such as tourism and the exportation of goods.

Other events produced by the volcano, which give rise to other natural disasters, are lahars and pyroclastic fall and flow events, as well as the lateral explosion and the formation of new eruptive foci with associated lavas.

5. Goma (RDCongo)

An ominous threat lurks beneath a lake near the city of Goma in the Democratic Republic of Congo.

An eruption beneath the lake could trigger the release of a deadly, suffocating cloud of gas, experts fear.

Known as a limnic eruption, the event poses a rare but potentially catastrophic risk to the people of Goma.
A limnic eruption involves the release of dissolved gases that have accumulated in the depths of a lake. Gases such as carbon dioxide (CO2) and methane can enter lakes through volcanic vents.

To trigger the release of these gases into the water, a disturbance of some kind is required.

This disturbance can be an eruption, a landslide, an earthquake or even a slight increase in water temperature.

TOP 5 OF THE CITIES THAT ARE BUILT ON VOLCANOES.

1. NAPLES (Italy)

2. Auckland (New Zealand)

3. Aden (Yemen)

4. Cartago (Costa Rica)

5. Goma (RDCongo)

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