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Running beneath the Italian city of Naples and the surrounding area is an underground geothermal zone and several tunnels dug during the ages. This geothermal area is present generally from Mount Vesuvius beneath a wide area including Pompei, Herculaneum, and from the volcanic area of Campi Flegrei beneath Naples and over to Pozzuoli and the coastal Baia area. Mining and various infrastructure projects during several millennia have formed extensive caves and underground structures in the zone.
Over millennia, extreme geothermal pressure has helped form a strong, durable tuffaceous volcanic sandstone called tuff, a rock composed of compressed and compacted volcanic ash ejected during a volcanic eruption. The entire Naples area is a geothermal region with deep veins of the tuff sandstone, generically referred to as "yellow tuff". It runs in deep veins beneath Naples and the area around it in strata which are found at different depths.
Tuff is strong and easily worked, making it an ideal building material. Tuff was mined through access and removal shafts called the occhio di monte, ("eye of the mountain"). Through these shaft, gigantic blocks of tuff were quarried and pulled up. The resulting void was a bottle shaped cavity with sloping shoulders, which provided ample reinforcement to prevent future cave-ins. After the tuff was quarried it was used as building material during roughly the Angevin, Aragonese and Bourbon periods.
The resulting caverns were later used to form water reservoirs into which water was diverted from the main aqueducts, and the Ancient Greeks dug long and elaborate aqueducts beneath the city more than 2,500 years ago. These provided fresh water to the villas and palaces above through use of the deep reservoirs and cisterns. Well shafts were also dug offering community access to the reservoirs below.
Over the centuries a massive honeycomb of caverns and passageways has been created beneath Naples and its environs. In World War II, many of the quarry shafts were enlarged and spiraling stairways were added, opening up the caverns for use as air raid shelters.
The resulting cavities beneath the city can now be divided up into several major categories:
Today, tours of the elaborate underground beneath Naples are available and there is even a museum of the underground located beneath Piazza Cavour in a huge quarry cavity with connecting tunnels and aqueduct passageways. It contains elaborate replicas of Greek hypogea and many ancient artifacts discovered during more than half a century of exploration.
Mount Vesuvius is a somma–stratovolcano located on the Gulf of Naples in Campania, Italy, about 9 km (5.6 mi) east of Naples and a short distance from the shore. It is one of several volcanoes forming the Campanian volcanic arc. Vesuvius consists of a large cone partially encircled by the steep rim of a summit caldera, resulting from the collapse of an earlier, much higher structure.
Bradyseism is the gradual uplift or descent of part of the Earth's surface caused by the filling or emptying of an underground magma chamber or hydrothermal activity, particularly in volcanic calderas. It can persist for millennia in between eruptions and each uplift event is normally accompanied by thousands of small to moderate earthquakes. The word derives from the ancient Greek words βραδύςbradús, meaning "slow", and σεισμόςseismós meaning "movement", and was coined by Arturo Issel in 1883.
The volcanism of Italy is due chiefly to the presence, a short distance to the south, of the boundary between the Eurasian Plate and the African Plate. Italy is a volcanically active country, containing the only active volcanoes in mainland Europe. The lava erupted by Italy's volcanoes is thought to result from the subduction and melting of one plate below another.
Pozzuoli is a city and comune of the Metropolitan City of Naples, in the Italian region of Campania. It is the main city of the Phlegrean Peninsula.
Phlegraean Fields' is a large caldera volcano west of Naples, Italy. It is part of the Campanian volcanic arc, which includes Mount Vesuvius, about 9 km east of Naples. The Phlegraean Fields is monitored by the Vesuvius Observatory. It was declared a regional park in 2003.
Pompeii is a novel by Robert Harris, published by Random House in 2003. It blends historical fiction with the real-life eruption of Mount Vesuvius on 24 August 79 AD, which overwhelmed the town of Pompeii and its vicinity. The novel is notable for its references to various aspects of volcanology and use of the Roman calendar. In 2007, a film version of the book had been planned and was to be directed by Roman Polanski with a budget of US$150 million, but was cancelled due to the threat of a looming actors' strike.
The Crypta Neapolitana is an ancient Roman road tunnel near Naples, Italy. It was built in 37 BC and is over 700 metres long.
Agnano is a suburb of Napoli, Italy, situated southwest of the city in the Campi Flegrei region. It was popular among both ancient Greeks and Romans and was famed for its hot sulphurous springs.
Ercolano is a town and comune in the Metropolitan City of Naples, Campania of Southern Italy. It lies at the western foot of Mount Vesuvius, on the Bay of Naples, just southeast of the city of Naples. The medieval town of Resina was built on the volcanic material left by the eruption of Vesuvius that destroyed the ancient city of Herculaneum, from which the present name is derived. Ercolano is a resort and the starting point for excursions to the excavations of Herculaneum and for the ascent of Vesuvius by bus. The town also manufactures leather goods, buttons, glass, and Lacryma Christi wine.
The Aqua Augusta, or Serino Aqueduct, was one of the largest, most complex and costliest aqueduct systems in the Roman world; it supplied water to at least eight ancient cities in the Bay of Naples including Pompeii and Herculaneum. This aqueduct was unlike any other of its time, being a regional network rather than being focused on one urban centre.
Piperno is a magmatic rock present in areas where there has been volcanic activity. Piperno abounds in Campania; the areas from which it was obtained were the city of Quarto, Soccavo, Pianura and Nocera Inferiore in the supervolcano region of the Phlegraean Fields. The Piperno layer, with the overlying Breccia Museo, is clearly visible at the base of the Camaldoli hill, in the Soccavo and Verdolino areas.
Monte Nuovo is a cinder cone volcano within the Campi Flegrei caldera, near Naples, southern Italy. A series of damaging earthquakes and changes in land elevation preceded its only eruption, during the most recent part of the Holocene, which lasted from September 29 to October 6, 1538, when it was formed. The event is important in the history of science because it was the first eruption in modern times to be described by a large number of witnesses. The eruptive vent formed next to the medieval village of Tripergole on the shores of the then-much larger Lake Lucrino. The thermal bath village, which had been inhabited since ancient Roman times and was home to notable Roman-era buildings including Cicero's villa, was completely buried by ejecta from the new cinder cone. Tripergole's ruins and its important thermal springs completely disappeared under Monte Nuovo such that the exact location of the village can no longer be identified.
The Campanian volcanic arc is a volcanic arc that consists of a number of active, dormant, and extinct volcanoes in the Campania region of Italy. The Campanian volcanic arc centers on the bay of Naples and includes:
Miseno is one of the frazioni of the municipality of Bacoli in the Italian Province of Naples. Known in ancient Roman times as Misenum, it is the site of a great Roman port.
Caserta railway station serves the city and comune of Caserta, in the region of Campania, southern Italy. Opened in 1843, it forms the junction between the Rome–Cassino–Naples railway and the Naples–Foggia railway.
An aqueduct is a watercourse constructed to carry water from a source to a distribution point far away. In modern engineering, the term aqueduct is used for any system of pipes, ditches, canals, tunnels, and other structures used for this purpose. The term aqueduct also often refers specifically to a bridge carrying an artificial watercourse. Aqueducts were used in ancient Greece, the ancient Near East, ancient Rome, ancient Aztec, and ancient Inca. The simplest aqueducts are small ditches cut into the earth. Much larger channels may be used in modern aqueducts. Aqueducts sometimes run for some or all of their path through tunnels constructed underground. Modern aqueducts may also use pipelines. Historically, agricultural societies have constructed aqueducts to irrigate crops and supply large cities with drinking water.
Naples Metropolitan Railway service are two independent companies that operate a commuter rail system in Naples. The first one, Trenitalia, operates line 2 from Pozzuoli Solfatara to Gianturco station in East of Naples. The other one, EAV, operates the Circumvesuviana, Cumana, Circumflegrea and MetroCampania NordEst. In Italy, Naples is the only city possessing two independent metropolitan railway service companies.
The Campanian Ignimbrite eruption was a major volcanic eruption in the Mediterranean during the late Quaternary, classified 7 on the Volcanic Explosivity Index (VEI). The event has been attributed to the Archiflegreo volcano, the 12-by-15-kilometre-wide caldera of the Phlegraean Fields, located 20 km (12 mi) west of Mount Vesuvius under the western outskirts of the city of Naples and the Gulf of Pozzuoli, Italy. It is the largest explosive volcanic event in Europe in the past 200,000 years, and the largest eruption of Campi Fleigrei caldera.
Naples (Italy) and its immediate surroundings preserve an archaeological heritage of inestimable value and among the best in the world. For example, the archaeological park of the Phlegraean Fields is directly connected to the centre of Naples through the Cumana railway, and the nearby sites of Pompeii, Herculaneum, Stabiae and Oplontis are among the World Heritage Sites of UNESCO.
The Phlegraean Fields red zone is the area at greatest volcanic risk in the Phlegraean Fields, in Italy.