Pompeii, Vesuvius and Naples: The 79 AD eruption, archaeological discoveries and modern disaster management

Introduction and historical context

The history of Mount Vesuvius, located on the shores of the Bay of Naples in Italy, and the ancient Roman cities of Pompeii, Herculaneum, Oplontis, Stabiae, and Boscoreale that were destroyed at its foot are one of the most important and tragic chapters in the geological, archaeological, and historical research of human civilization . 1 In 79 AD, an unimaginably devastating eruption of Mount Vesuvius buried an entire thriving urban civilization under meters of ash, pumice, and lapilli. This catastrophe not only brought life in those cities to a standstill forever, but it also preserved a perfect snapshot or time capsule of ancient Roman life, which is still a source of endless research for archaeologists today. Since being designated a UNESCO World Heritage Site in 1997, the Pompeii archaeological site has become the second most visited historical site in Italy, after the Colosseum in Rome .

During the Roman Empire, the area around the Bay of Naples was a popular vacation spot for the wealthy and affluent Romans. The mild Mediterranean climate and fertile volcanic soil gave rise to numerous farms, villas, and settlements. But the geological nature of Mount Vesuvius was not understood scientifically at the time. The eruption of 79 AD is not only a geological and archaeological reminder of the devastation of the past, but also a living laboratory that provides a detailed account of volcanic activity, the human struggle to survive in the face of extreme disasters, and the complexities of managing such disasters in modern times. This research report presents a comprehensive, thorough and in-depth analysis of the geological nature of Mount Vesuvius, the stratigraphic analysis of the 79 AD eruption, the exact cause of death of the inhabitants of Pompeii and Herculaneum, the evolution of the famous 'plaster cast' method invented by Giuseppe Fiorelli, and above all, the emergency evacuation plan for the 'red zone' designated for modern Naples and its surrounding areas.

The geological nature of Mount Vesuvius and the eruption of 79 AD

Mount Vesuvius is a highly complex and active stratovolcano, known for its long history of highly explosive and destructive eruptions . 3 The devastating eruption of 79 AD is known in modern geology as a "Plinian" eruption . 1 It is named after the Roman writer and administrator Pliny the Younger, who was the only person in history to record a visual account of the event from a distance in such detail . 1

The destructive power of this eruption was greater than that of any modern weapon. Studies have shown that Vesuvius was spewing about 1.5 million tons of molten rock, crushed pumice, and hot ash into the stratosphere every second . 3 The thermal energy released by this massive volcanic eruption was about 100,000 times greater than the combined energy of the atomic bombs dropped on Hiroshima and Nagasaki, Japan, during World War II . 3 The initial phase of the eruption was a phreatomagmatic or steam-driven explosion, which opened the blocked part or "cap" of the volcano's vent and established a direct connection to the surface with the main magma chamber . 1

Prediction of eruption and flight of elites

The catastrophe of 79 AD did not come as a complete bolt from the blue. Historical evidence and geological analysis show that a strong earthquake had been felt in the region about 17 years before the main eruption, a clear harbinger of the impending catastrophe . 4 At that time, many of the noble and aristocratic Roman families had sold their damaged but luxurious homes to newly wealthy merchant families and moved away . 4 But those who remained could not connect the earthquake with the volcanic activity, and so had no idea of the deadly danger that lay ahead. When Vesuvius erupted in full force, no one—rich, poor, or slave—was spared its wrath . 4

Scientific debate regarding the timing of eruptions

For a long time, there was a general consensus in historical and archaeological circles that the eruption of Vesuvius occurred on August 24–25, 79 AD. The main basis for this assumption was the historical letters written by Pliny the Younger . 3 However, archaeological excavations and material evidence in recent decades have challenged this traditional idea, and modern scholars believe that the devastation probably occurred in October or November 79 AD . 3

There are several strong and compelling arguments behind this modern hypothesis. First, the plaster casts or molds of the bodies of the victims clearly show that many were wearing heavy and thick clothing. Wearing such heavy clothing in the sweltering August heat of southern Italy is completely impractical 3 . Second, the excavations have found braziers or firepans in various houses, which were usually used to heat food as well as to keep the house warm in winter 3 . This evidence strongly suggests that the eruption did not occur in late summer, but rather in autumn or early winter.

The stages of destruction: the fate of Herculaneum and Pompeii

The eruption of Vesuvius did not have the same impact on surrounding cities. The types of destruction and causes of human death varied between cities, depending on their geographical location and distance from the volcano.

Pliny the Elder's role in the disaster is a very important human aspect. He was the commander of the Roman fleet at Misenum, on the other side of Vesuvius. After the eruption began, his friend Rectina—who lived in a villa near Herculaneum—sent him a letter pleading for rescue by sea. 1 Pliny the Elder ordered a galley to be prepared and set out on a rescue mission . 1 But the intensity of the eruption was so great that the rescue operation was unsuccessful, and Pliny the Elder himself was trapped on the edge of a pyroclastic flow and died . 1 Meanwhile, Pliny the Younger, some 20 kilometers away, also experienced the final "base surge" phase, but survived . 1

The immediate fall of Herculaneum

The town of Herculaneum, located just 8 km from the summit of Vesuvius, was a luxury resort 1 . At approximately 8 pm on the day of the eruption, the upward gas and ash cloud began to subside and the main volcanic column began to collapse 1 . The collapse of this column caused a catastrophic flow of superheated gas and fragmented rock, known as a pyroclastic surge, to rush down the mountainside at high speed 1 . This surge was so powerful and so massive that it pushed the coastline of Herculaneum hundreds of metres out to sea 1 . The temperature and velocity of this flow were so high that it was completely impossible for the inhabitants of the town to survive and they died instantly 6 .

The painful destruction of Pompeii: Stratigraphic analysis

The destruction of Pompeii was a much more prolonged and painful process. Based on stratigraphy and archaeological evidence, the destruction of Pompeii can be divided into two main phases. A total of 1,150 remains have been recovered from Pompeii during excavations, with causes of death closely related to both phases . 6

During the first phase of the eruption, the city of Pompeii was exposed to a heavy rain of lapilli (small volcanic rocks) and pumice falling from the sky 7 . Stratigraphic evidence suggests that this pumice and lapilli formed a layer of about 3 to 5 meters high over the city 5 . Remarkably, the roofs and walls of many buildings were able to survive this torrential rain for several hours, allowing many residents to flee in panic and seek shelter indoors 8 .

But as time passed, the weight of the volcanic material on the roofs of the buildings began to increase at an alarming rate. At the same time, the movement of magma underground due to the eruption began to cause severe earthquakes. Due to these continuous earthquakes and the additional weight of the volcanic material, the structures of the city could no longer withstand and began to collapse. 5 Many residents, who initially felt safe inside their buildings, panicked at the intensity of the earthquake and tried to escape into the streets . 8 According to archaeological data, 38% of the total bodies recovered in Pompeii were crushed to death under the heavy rubble of the roof and walls in this initial phase . 6 Rectina's friend Pliny the Elder and his companions also tried to protect themselves from the hail of stones by tying pillows over their heads while fleeing from a villa, which testifies to the terrible conditions of the time . 1

In the next phase, probably after midnight, several (four to six) phreatomagmatic eruptions occurred within the volcano, generating pyroclastic density currents (PDCs) 1 . In the second phase of the eruption (August 25 or October 2), the city of Pompeii was hit by a flow of high-temperature gases and ash with great velocity. This flow penetrated all parts of the city that were not yet filled with lapilli or other volcanic material 5 . The remaining 62% of the population died in this phase, of whom 49% were on the streets and 51% were inside buildings 6 . Regardless of location, these people were exposed to the unexpected arrival of pyroclastic flows 6 .

New stratigraphic data suggest that some people survived the first-stage pyroclastic flows, as their bodies were found above the lower PDCs deposits . 6 But they were killed by subsequent flows.

Suffocation and Thermal Shock: Scientific Causes of Death

The cause of death in Pompeii has long been debated. Recent scientific modeling and research suggest that, because Pompeii was located in a more distal area of the volcano, the temperature and mechanical energy of the pyroclastic flow that struck it were lower than at Herculaneum . 6 The lack of any mechanical injury or trauma on the bodies found at Pompeii supports this theory . 6

So what was the real cause of their death? Researchers have found that pyroclastic flows are ground-hugging gas-particle flows 6 . In addition to temperature and pressure, the duration or exposure time is a very important parameter for these flows. In Pompeii, this flow of hot gas and ash lasted for about 17 minutes 6 . According to scientists, if this flow had lasted only a few minutes, there would have been a slim chance for people to survive. But due to the long-lasting flow of 17 minutes, the dense ash floating in the air entered the lungs through inhalation and caused terrible asphyxiation, which inevitably led to their death 6 . Furthermore, the intense temperatures mixed with the ash caused thermal shock, causing many to die instantly, their bodies frozen in the exact position they were in when the pyroclastic flow struck . 5

Plaster Cast: Living Documentary and Scientific Analysis of Suffering

The most groundbreaking, surprising, and emotional discovery in the excavations of Pompeii was the plaster casts of the victims of the eruption. A common misconception among visitors is that these casts are probably the actual bodies of people who were petrified in the eruption. But in fact, they are not petrified bodies at all, but rather perfect replicas of the bodies of the victims, created in plaster using a special archaeological method . 7

When the pyroclastic flows and gaseous vapors covered everything during the eruption, it hardened the ash around the bodies 7 . Over the centuries, human bodies, furniture, wooden structures, and other organic materials buried under the lapilli and this hardened ash layer slowly decomposed, creating voids underground 4 . These cavities essentially act as a natural negative mold or cast of the body or object.

Giuseppe Fiorelli's invention and the history of cast making

The initial idea of preserving these natural molds of Pompeii was first applied by the former director of excavations, Antonio Bonucci. He made the first casts by pouring liquid plaster into these cavities. However, his experiments were limited to wooden elements and furniture, he never applied this method to human bodies . 7

In 1863, Giuseppe Fiorelli, then head of the city administration and director of works in Pompeii, made a breakthrough in this method. While excavating, he discovered mysterious hollows in the ground, from which human bones were protruding . 4 Fiorelli, who was familiar with the techniques of sculpture and metal casting, applied this knowledge to archaeology. He realized that these cavities actually took the shape of a decomposed human body. He carefully poured liquid plaster into the cavities. After the plaster set, the surrounding ash, soil, and pumice were removed, revealing the perfect three-dimensional shape of the body . 2

Fiorelli's method was an unimaginable milestone in the history of archaeology. He found a total of 650 empty cavities, from which he was able to make 100 perfect casts . 4 The last moments of the dead, after being buried in the ground for the eighteenth century, are very clearly revealed in these casts . 4 The terrible pain of death by suffocation and the signs of muscle contraction due to thermal shock are still visible on their faces and bodies . 7 A contemporary scholar, explaining the importance of Fiorelli's discovery, commented: "It is impossible to look at these three deformed figures without being moved inwardly... They have been dead for the eighteenth century, but they are people whose agony of death you can see with your own eyes. This is not art, this is not imitation... This is the agony of death regaining body and form... " 4

Notable cast, preservation, and modern analysis

Around 100 casts made by Fiorelli in the 19th century were initially displayed in special showcases inside the excavation area . 7 These casts were opened to visitors in the first Museo Pompeiano, founded by Fiorelli in 1873–1874 . 5

Later, especially in the 20th century, archaeologists decided that the casts should be displayed in the original location of their discovery. The most famous of these is the "Garden of the Fugitives", located in Regio 1, insula 21. It contains the casts of 13 bodies of an entire family. The group, consisting of men, women and children, were desperately trying to escape the wrath of the eruption, but they all eventually succumbed to their deaths . 5 These casts are currently preserved under special glass covers.

The casts contain many heartbreaking stories. One of them is the two embracing casts found in the Cryptoporticus house. For a long time after their discovery, they were believed to be a man and a woman, a loving couple, who embraced each other just before they died. But modern scientific analysis has shown that they were actually both men, and perhaps homosexual . 7

These plaster casts are not only scientific or historical artifacts, but they have also served as a great source of inspiration for art, literature and film. The famous writer Primo Levi was deeply moved by these casts and wrote a wonderful poem called 'The Girl-Child of Pompeii' 5 . Similarly, the famous film director Roberto Rossellini skillfully depicted a scene of the discovery of the casts in Pompeii in his film 'Journey to Italy' 5 .

Unfortunately, during World War II, during the Allied bombings of 1943, many of Pompeii's historical monuments were destroyed and many of the casts on display were severely damaged. However, the hard work of the famous archaeologist Maiuri and his dedicated collaborators made it possible to partially restore the damaged casts . 5 Although the new Antiquarium, or archaeological museum, was opened in 1948 after the war, many of the casts that had survived the war were not included . 5

In recent years, an extensive survey has been carried out under the 'Great Pompeii Project' and many casts thought to have been lost have been rediscovered 5 . A very modern approach is now being taken to the preservation effort. Old plaster or resin casts are being laser scanned to create 3D copies or prints. These 3D copies will be sent to various temporary exhibitions around the world, thereby protecting the valuable original casts from damage and displaying them as unique evidence in Pompeii itself 5 . A permanent exhibition has been organised in the large gymnasium of Pompeii since 12 March 2026, where 22 of the best preserved casts are on display 7 .

Modern science has opened a new window into understanding the contamination of plaster and its effects on the bones of corpses. Although the Pompeii casts have been extensively studied, the exact cause of death has been controversial, and the chemical changes in the bones caused by the plaster have not been well evaluated 6 . Six casts from the Porta Nola area and one cast from the Terme Suburbane area have now been examined using a non-invasive chemical analysis method called portable X-ray fluorescence (pXRF) 6 . By comparing the chemical data of bones from Pompeii casts, as well as from the Porta Nola necropolis, the Sepolcreto Ostiense in Rome, and Valencia in Spain, scientists have been able to determine the effects of high temperatures on the bones and chemical contamination caused by plaster while they were underground . 6 This scientific advance has opened a new era in future archaeological excavations and cast conservation.

Modern disaster management: Vesuvius' red zone and the risk to Naples

From Pompeii to Herculaneum to Oplontis or Boscorial—Vesuvius has destroyed many settlements over the centuries, and after centuries of hiding from the public eye, they were rediscovered by archaeologists in the 1700s . 1 But the biggest truth is that Mount Vesuvius is not a dead volcano, but rather a very active one . 3 It has erupted at least three dozen times since the cataclysmic event of 79 AD . 3 A major eruption in 1631 devastated Naples and surrounding villages and killed about 4,000 people . 3 In more modern times, Vesuvius also erupted several times between 1913 and 1944. 3 Although the volcano has been dormant since 1944, scientists are certain that it will erupt again in the future . 3 Since millions of people currently live at the foot of Vesuvius, it is considered one of the world's most dangerous hotspots.

To deal with potential disasters, the Italian National Civil Protection has developed a very well-planned and comprehensive 'National Emergency Plan for Volcanic Risk' 9 . The main objective of this plan is to define the risk zones based on volcanic activity and to have a perfect logistical structure in place for emergency evacuation. Under this plan, the areas around Vesuvius are mainly divided into two zones: the Red Zone and the Yellow Zone 9 . The management of this management has been carried out with two headquarters in Rome, the historical (Via Ulpiano, 11) and the operational (Via Vittorio Emanuele, 2) 9 .

Red Zone: The zone of extreme danger

The final boundaries of the Red Zone were established on 14 February 2014 by the Italian Prime Minister 9 . This zone identifies areas that are directly exposed to high temperatures and high-speed pyroclastic flows (PDCs). History shows that the extreme temperatures and unimaginable speeds of pyroclastic flows make it impossible for people to survive 9 . Furthermore, there is an extreme risk of roof collapses due to the massive accumulation of volcanic ash and lapilli in this area, as occurred in the first phase of Pompeii in 79 AD 9 .

The red zone consists of 25 municipalities in the provinces of Naples and Salerno 9 . For the approximately 800,000 people living in this area, the only effective protection against a possible volcanic eruption is a complete preventive evacuation 3 . There is no other option but to evacuate people to a safe place as soon as an eruption is predicted. For this reason, the Italian government has developed an emergency and very rapid evacuation plan, which will completely evacuate the red zone 72 hours before a possible eruption 3 .

Yellow Zone: Risk of ash fall

The Yellow Zone, approved by the Italian Prime Minister on 16 November 2015, indicates a large area that will experience significant volcanic ash fallout during an eruption . 9 This ash can be very heavy and toxic. People living in areas where the ash accumulation could weaken the structure of buildings or make transportation completely difficult may need to be temporarily evacuated. 9 The Yellow Zone covers 63 municipalities and three districts of the city of Naples . 9

Many geologists and experts, however, have warned that the entire city of Naples should be more closely included in the current emergency plan. According to them, a very powerful volcanic eruption like Vesuvius is dangerous and could easily spread burning ash and pumice up to 12 miles away, which would put a large part of the city of Naples at risk 3 .

Relocation and Shelter Logistics

In the event of an emergency, the government has adopted a specific logistical plan. Several specific "waiting areas" have been designated for the orderly evacuation of citizens from the red and yellow zones. When the "alarm" is officially declared by the government, citizens will gather in these designated areas 9 . From there, buses allocated by the Campania Region will take them to "meeting areas" located in safe places outside the red zone 9 .

From these meeting areas, citizens can travel to a safe location of their choice by assisted transportation—such as by bus, train, or ship. 9 Under an innovative plan by the Italian government, municipalities in the affected areas are linked or “twinned” with other regions and autonomous provinces in Italy. This will allow displaced people to take shelter in pre-designated areas, which will greatly help to avoid chaos during a disaster . 9

Greater significance and potential impact

Analysis of this long geological, historical, and archaeological record of Pompeii, Herculaneum, and Mount Vesuvius provides a number of second- and third-order insights into the interrelationships between human civilization and nature.

First, the chronological and stratigraphic analysis of the 79 AD eruption is a very important warning for modern urban planning and disaster management. From the data obtained in Pompeii, we see that 38% of deaths were due to roof collapses and 62% to suffocation caused by pyroclastic flows . 6 This irrefutably proves that sheltering indoors, while temporarily safe in the early stages of an eruption, is ultimately bound to become a death trap due to the increasing weight of ash and lapilli. This historical fact is the basis of modern evacuation plans. The need for a 72-hour preventive evacuation stems from the grim realization that once an eruption begins and the pyroclastic flow descends, no technological means have been invented to protect people from its 17-minute duration, even in modern times . 3

Second, the suddenness of the phreatomagmatic eruption and the Plinian eruption make it clear how quickly a violent act of nature can wipe out a thriving population. Despite the warning signs of a major earthquake 17 years before the eruption, the lack of adequate preparation by the Romans at the time was the main reason for the massive loss of life 1 . Considering the 800,000 people currently living in the red zone of Vesuvius, the entire socio-economic stability around the Bay of Naples is heavily dependent on the geological behavior of this volcano 3 . A single eruption could have an unimaginable impact on the economy and demographics of Italy.

Third, modern scientific evaluation of plaster casts has revolutionized the science of archaeology. Chemical analysis of casts using pXRF technology is not only determining the effects of high temperatures on human bones, but also helping to correct the errors of past research by identifying contamination caused by plaster . 6 This will encourage the use of more advanced non-invasive technologies in any future archaeological excavation and conservation, which will help to extract the maximum scientific information from historical artifacts while preserving them.

Conclusion

The ruins of Pompeii and Herculaneum, located on Mount Vesuvius, are one of the most tragic and instructive and informative chapters in human history. The precise scientific and stratigraphic analysis of the devastation caused by the eruption of 79 AD shows us clearly how pyroclastic flows and volcanic ash fall gradually wiped out an entire urban civilization. The groundbreaking plaster cast method invented by Giuseppe Fiorelli not only embodied the final agony of the dead, but also created a universal and touching language of human suffering that is equally relevant and appealing beyond the eighteenth century and into the modern era.

On the other hand, the invaluable knowledge gained from this historic disaster is acting as a very important catalyst in modern disaster management. The precise mapping of the Red Zone and Yellow Zone, and the preventive evacuation plan to move citizens to safer places 72 hours before the eruption, demonstrate how the combination of science, history and geology is capable of saving millions of lives. Mount Vesuvius is still a sleeping giant, which can wake up at any time. But the lessons learned from the ruins of the past, modern analysis of archaeological discoveries and above all, well-thought-out state management have made humanity more alert, prepared and confident than ever before to face the possible catastrophes of the future.

Sources of quotes

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3. What volcano destroyed Pompeii? The story of the ancient city of, https://www.romecabs.com/blog/docs/what-volcano-destroyed-pompeii-story-of-ancient-city-of-rome/

4. Casts of human victims of the 79 AD volcanic eruption in Pompeii, https://www.fkv.de/en/abguesse-menschlicher-opfer-des-vulkanausbruchs-79-n-chr-in-pompeji-aus-der-sammlung-des-archaeologischen-parks-von-pompeji/

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7. Pompeii casts: where they are found and what they are, https://seepompeii.com/en/pompeii-casts-where-they-are-found-and-what-they-are/

8. (PDF) The Ancient Pompeians Still Speak: The AD 79 Vesuvius, https://www.researchgate.net/publication/402991704_The_Ancient_Pompeians_Still_Speak_The_AD_79_Vesuvius_Eruption_and_Its_Catastrophic_SequenceTold_by_Its_Victims

9. Map of National Emergency Planning for Vesuvius - Mappe, https://mappe.protezionecivile.gov.it/en/risks-maps-and-dashboards/national-planning-vesuvius/