A Year: Day to Day Men: 16th of December
Observing the Street Below
The sixteenth of December marks the beginning of the 1631 eruption of Mount Vesuvius, a conical Italian volcano built up by many layers of hardened lava and unconsolidated material. The eruption, marked by columns of volcanic debris, ash and hot gases, buried many villages under the resulting lava flows. It is estimated that four-thousand people were killed by the eruption, which was so intense that it lowered the summit of Vesuvius by four hundred and fifty meters.
Located on the Gulf of Naples in Campania, Mount Vesuvius has a long historic and literary tradition. At the time of the 79 AD eruption, the volcano was considered a divinity of nature. The Roman cities surrounding the volcano regarded Mount Vesuvius as being devoted to Hercules. This was particularly true for the city of Herculaneum ,which was named after its mythical founder. Frescoes depicting Vesuvius as a serpent decorated many of the household shrines in Pompeii; inscriptions on walls linked the power of the god Jupiter to the volcano, IOVI VESVVIO, or Jupiter Vesuvius.
Mount Vesuvius has erupted multiple times with varying grades of severity. All of its eruptions included explosive outbursts named Plinian after the Roman writer Pliny the Younger, who published a detailed account of the 79 AD eruption that killed his uncle. That eruption was largest and most destructive of all Vesuvius eruptions. Its cloud of super-heated gases and particles reached a height of thirty-three kilometers. The molten rock, pumice and hot ash ejecta reached sped at a rate of one and a half million tons per second. This volcanic event destroyed several Roman towns and completely obliterated Pompeii and Herculaneum under massive pyroclastic surges and ash fall deposits.
Today, Mount Vesuvius is considered the world’s most dangerous volcano. This is due to two main factors: it has erupted violently and frequently through the years and the large number of people living in its vicinity. The area surrounding Mount Vesuvius is the most densely populated volcanic region in the world. Three million people live near enough to be affected by an eruption, with at least six-hundred thousand in the danger zone. Mount Vesuvius is among the most closely monitored volcanoes in the world. The network consists of a number of fixed seismic stations on the surface of the earth with sensors that detect the motion of the soil, changes in the gravimetric field and indicative shifts in the magnetic masses in the subsurface.

















