The Death of the
Cities
A moonless night falls on the Forum of Pompeii, now empty after most visitors have left. [Photo by Author] |
The eruption of Mount Vesuvius in 79 AD
certainly had a quite extraordinary eyewitness. Pliny the Younger, then only 18
years old, described the tragedy unfolding from his villa in Misenum, on the
opposite side of the bay of Naples, in two letters that he wrote to his friend
and famous historian Cornelius Tacitus.
At that time, Pliny's uncle (also called Pliny the Elder) was stationed in Misenum as the admiral of the Roman fleet, and could witness
from that vantage point all the stages of the eruption.
We will borrow from his narrative to recall the final hours of Pompeii.
August 24th,
79 AD – 1:00 pm
“On 24
August, in the early afternoon, my mother drew his attention to a cloud of
unusual size and appearance […]It was not clear at that distance from which
mountain the cloud was rising (it was afterwards known to be Vesuvius); its
general appearance can best be expressed as being like an umbrella pine, for it
rose to a great height on a sort of trunk and then split off into branches, I
imagine because it was thrust upwards by the first blast and then left
unsupported as the pressure subsided, or else it was borne down by its own
weight so that it spread out and gradually dispersed. In places it looked
white, elsewhere blotched and dirty, according to the amount of soil and ashes
it carried with it” [1]
Around 1 pm, the pressure that had for centuries
accumulated inside the Caldera of
Mount Vesuvius finally burst out, causing the rock cap that for centuries had kept it contained inside the mountain to explode. The initial explosion produced
a column of ash and pumice rising as high as 25 Km into the atmosphere,
which started pouring on Pompeii to the Southeast in the form of a heavy ashfall. In this
stage, the sky remained clear on Herculaneum, that was spared the ash and
pumice rain as long as it remained upwind.
The pumice started very soon to accumulate in Pompeii,
reaching in a span of hours a considerable thickness that started to threaten
buildings and constructions under its weight. In this stage many people might
have decided to leave the city, perhaps trying to reach the hills or the sea. Mixed with the light pumice were
however larger fragments of lava and molten rock that the explosion had ejected
miles aways from the main crater. These fragments started falling with the
strength of projectiles, piercing through the roofs of buildings and causing large
fires to break out.
August 24th,
79 AD – 4:00 pm
As Pliny started receiving terrified reports of citizens
trapped in their villas at the foot of the mountain, with no way of escape
except by sea, his responsibilities as admiral of the Roman fleet took over his
scientific curiosity:
“He gave
orders for the warships to be launched and went on board himself with the
intention of bringing help to many more people besides Rectina, for this lovely
stretch of coast was thickly populated.
He hurried to the
place which everyone else was hastily leaving, steering his course straight for
the danger zone. He was entirely fearless, describing each new movement and
phase of the portent to be noted down exactly as he observed them. Ashes were
already falling, hotter and thicker as the ships drew near, followed by bits of
pumice and blackened stones, charred and cracked by the flames: then suddenly
they were in shallow water, and the shore was blocked by the debris from the
mountain.” [1]
Pliny made route to Stabiae, a wealthy resort
to the South of Pompeii, where his friend Pomponianus had his villa. Pliny the
Younger recounts that his uncle greeted Pomponianus, cheering and encouraging
him; he then had a bath and dined, thinking that by his own conduct he could
calm his friend’s fears.
After the Eruption, Mount Vesuvius lost over half of its original elevation. Before the eruption, the slopes of Mount Vesuvius were entirely covered with vineyards. [Photo by Author] |
August 24th,
79 AD – 10:00 pm
As the night fell, “broad sheets of fire and leaping flames blazed at several points”
on Mount Vesuvius. In the meanwhile, the falling ash and pumice had piled up
already to a considerable height, almost filling the courtyard of the house
where Pliny was sleeping.
“By this
time the courtyard giving access to his room was full of ashes mixed with
pumice stones, so that its level had risen, and if he had stayed in the room
any longer he would never have got out. He was wakened, came out and joined
Pomponianus and the rest of the household who had sat up all night.
They debated whether
to stay indoors or take their chance in the open, for the buildings were now
shaking with violent shocks, and seemed to be swaying to and fro as if they
were torn from their foundations. Outside, on the other hand, there was the
danger of failing pumice stones, even though these were light and porous;
however, after comparing the risks they chose the latter. In my uncle's case
one reason outweighed the other, but for the others it was a choice of fears.
As a protection against falling objects they put pillows on their heads tied
down with cloths.”
[1]
August 24th,
79 AD – Midnight
While Pliny was sleeping unaware of the
terrible fate that doomed on the city, the great cloud of ash and pumice that
had risen as high as 30 Km into the atmosphere, collapsed spectacularly causing
massive pyroclastic surges that headed straight to Herculaneum. The surges
instantly killed everyone on their path, including those who had taken shelter
in the boathouses and on the beach and burying Herculaneum under 23 meters of
volcanic material. Miraculously, a second surge headed to Pompeii stopped a few
meters outside of the Herculaneum gate, thus sparing the city and those who had
found refuge within its walls.
August 25th,
79 AD – 6:00 am
That day, the Sun would not rise on Pompeii and
the other cities on the Southern Coast of the Bay of Naples. As Pliny recounts
“Elsewhere there was daylight by this
time, but they were still in darkness, blacker and denser than any ordinary
night, which they relieved by lighting torches and various kinds of lamp”. As
the elder scientist went on to investigate the possibility of an escape by sea,
poisonous gases released by the eruption caused him to fall to the ground,
where his body was later found untouched by the rescuers.
“Then the
flames and smell of sulfur which gave warning of the approaching fire drove the
others to take flight and roused him to stand up. He stood leaning on two
slaves and then suddenly collapsed, I imagine because the dense, fumes choked
his breathing by blocking his windpipe which was constitutionally weak and
narrow and often inflamed. When daylight returned on the 26th - two days after
the last day he had been seen - his body was found intact and uninjured, still
fully clothed and looking more like sleep than death.” [1]
At that point, many of the buildings in Pompeii
that had not collapsed under the weight of the thick ash and pumice were on
fire or shaking because of the continuous tremors.
August 25th,
79 AD – 8:00 am
A short couple of hours after dawn, the
Mountain exploded with terrifying power, causing massive surges to cover the
cities of Pompeii, Stabiae and Oplontis that had until then been spared by the
pyroclastic flows. Travelling at over 100 miles per hour, this last pyroclastic surge left no escape to those who had fled to
the hills or had decided to stay inside their houses in Pompeii. The
conflagration also caused a small tsunami to hit the Bay of Naples, as
testified by the retreat of the sea that Pliny himself witnessed at Misenum.
The surge then crossed the Bay of Naples as a fiery
cloud, reaching to Misenum where Pliny the Younger was witnessing in horror the
final stages of the eruption. This last passage of Pliny is worth quoting in
its entirety:
“A dense
black cloud was coming up behind us, spreading over the earth like a flood.
‘Let us leave the road while we can still see,'I said,'or we shall be knocked
down and trampled underfoot in the dark by the crowd behind. ‘We had scarcely
sat down to rest when darkness fell, not the dark of a moonless or cloudy
night, but as if the lamp had been put out in a closed room.
You could hear the
shrieks of women, the wailing of infants, and the shouting of men; some were
calling their parents, others their children or their wives, trying to
recognize them by their voices. People bewailed their own fate or that of their
relatives, and there were some who prayed for death in their terror of dying.
Many besought the aid of the gods, but still more imagined there were no gods
left, and that the universe was plunged into eternal darkness for evermore.
There were people,
too, who added to the real perils by inventing fictitious dangers: some
reported that part of Misenum had collapsed or another part was on fire, and
though their tales were false they found others to believe them. A gleam of
light returned, but we took this to be a warning of the approaching flames
rather than daylight. However, the flames remained some distance off; then darkness
came on once more and ashes began to fall again, this time in heavy showers. We
rose from time to time and shook them off, otherwise we should have been buried
and crushed beneath their weight. I could boast that not a groan or cry of fear
escaped me in these perils, but I admit that I derived some poor consolation in
my mortal lot from the belief that the whole world was dying with me and I with
it.” [1]
After the eruption subsided, what was left was
a devastated and almost lunar landscape. The cities of Pompeii, Herculaneum,
Stabiae and Oplontis, together with countless villages on the slopes of Mount
Vesuvius, had been completely destroyed and buried under as much as 23 meters
of volcanic ash. In Pompeii, ash and pumice had piled up as high as 5 meters,
covering almost every building but the largest public structures. Where Mount
Vesuvius once stood, was now a huge crater created by the collapse of the magma
chamber. Thousands had been killed in Pompeii and Herculaneum, and many more
had been left without a house or shelter.
A dog, still wearing a collar and tied to its chain, was also among the victims of the final surge that invested Pompeii. [Photo by Author] |
A rescue was organized, and the Emperor himself
appointed two ex-consuls to coordinate the relief effort. But the destruction
was just too great. Life resumed along the coast of the Bay of Naples, as many
towns were reconstructed and the extensive damage caused by the eruption in
Naples and other cities as far as 50 miles from Mount Vesuvius was restored.
Pompeii and Herculaneum, however, would lay
forgotten for almost 1,500 years, until workers digging for an aqueduct in Pompeii
unearthed some walls and frescoes. It was not until the Borbonic excavations of
the 18th and 19th Century that a relevant portion of Pompeii
could see the light again, and even then it took many years before excavators
could positively confirm that the ruins they had been painstakingly uncovering
were indeed those of Pompeii.
Here is a very beautiful animation from the Melbourne Museum of the last hours of Pompeii:
References
[1] "The Destruction of Pompeii, 79
AD," EyeWitness to History, www.eyewitnesstohistory.com (1999).
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