Mount Etna (Mongibello in Italian; Muncibbeḍḍu in Sicilian; Aetna in Latin) is an active stratovolcano on the east coast of Sicily, in the Metropolitan City of Catania, situated between the cities of Messina and Catania. It is the largest active volcano in Europe and the highest peak in Italy south of the Alps, with a current elevation of approximately 3,403 metres, though this figure varies with summit eruptions, as collapses and accumulations at the craters periodically alter the summit height. Etna covers an area of approximately 1,190 square kilometres with a basal circumference of 140 kilometres.
The volcano lies above the convergent plate margin between the African Plate and the Eurasian Plate. Due to its proximity to a large population — approximately 900,000 people live in zones considered at potential risk — and its record of persistent activity, Etna has been designated a Decade Volcano by the United Nations. In June 2013 it was inscribed on the UNESCO World Heritage List.
Mount Etna is one of the most active volcanoes in the world and is in an almost constant state of activity.
Name and mythology
The etymology of the name is debated. One interpretation derives it from the Greek verb aíthō, meaning “to burn,” with Etna appearing in ancient Greek as Aítnē. Another view, cited by Adrian Room in his work on place names, traces it to the Phoenician word attuna, meaning “furnace” or “chimney.” The volcano is also known by the Arabic-derived composite name Mongibello, combining the Romance word monte and the Arabic jabal, both meaning “mountain,” producing a tautological toponym. Local inhabitants traditionally refer to it simply as la Montagna, the Mountain.
In Greek and Roman mythology, Etna held a central place in cosmological imagination. Hephaestus, the god of fire and blacksmithing, was said to have his forge beneath the mountain, attended by the Cyclopes. Zeus was held to have imprisoned the monster Typhon beneath it, whose struggles were held responsible for eruptions and earthquakes. The Roman poet Virgil described what was likely a first-hand observation of an eruption in the Aeneid. An eruption of Etna in 44 BCE was followed by famines in the Roman Republic and Egypt, with Plutarch among those noting a possible connection.
Geology and volcanic history
Etna is a polygenic stratovolcano: it does not represent a single volcanic edifice but the superimposition of at least two successive volcanic structures, known as Trifoglietto and Mongibello, each covering and partly obliterating the preceding one. Initial submarine volcanic activity in the area dates to approximately 500,000 years ago, forming the Plain of Catania, previously occupied by a marine gulf. Eruptions subsequently broke the surface and the aerial cone began to develop.
Between approximately 35,000 and 15,000 years ago, Etna experienced highly explosive eruptions that generated substantial pyroclastic flows and left ignimbrite deposits; ash from this period has been traced as far north as the area south of Rome. Around 8,000 years ago, the eastern flank of the volcano underwent a catastrophic collapse that generated an enormous landslide, leaving the large open depression known as the Valle del Bove on the eastern slope. Research published in 2006 suggested this event caused a significant tsunami across the eastern Mediterranean. The steeply walled Valle del Bove has since served as a natural reservoir for lava flows directed eastward from the summit.
The current summit area comprises four principal craters: the Voragine and the Bocca Nuova (both formed within the Central Crater, in 1945 and 1968 respectively), the Northeast Crater (formed in 1911, currently the highest point of the volcano), and the Southeast Crater Complex. This configuration represents a significant change from a century ago, when the summit featured only a single Central Crater.
Eruptive patterns
Etna sustains two broadly distinct styles of activity, which can occur simultaneously. Summit eruptions, generally persistent, consist of explosive activity and occasional lava emission from one or more of the summit craters. Flank eruptions, which originate from fissures opening progressively downslope from near the summit, are less frequent but typically emit lava at significantly higher rates. The interval between flank eruptions has averaged approximately two years over the past four decades, though it has ranged from a few months to over twenty years. The duration of a flank eruption varies from a few hours to over a year: the 1991–1993 eruption lasted 473 days; the 2008–2009 eruption lasted 419 days.
Since 1600, at least 60 flank eruptions and countless summit eruptions have been recorded; nearly half of the flank eruptions have occurred since the start of the twentieth century. Since 2000, four flank eruptions took place: in 2001 (three weeks), 2002–2003 (three months), 2004–2005 (six months), and 2008–2009 (419 days). From 2011 to 2015, the summit craters produced over forty paroxysmal episodes of lava fountaining; the Catania airport was forced to close on several occasions due to ash columns.
Historical eruptions
Volcanic activity at Etna has been documented since at least 1500 BCE, making it one of the longest-recorded eruptive histories on Earth. Among the more notable ancient events, an eruption of 396 BCE sent lava flows toward the sea, blocking the advance of the Carthaginian army of Himilco toward Catania during the Greco-Punic Wars, as recorded by Diodorus Siculus. The Plinian eruption of 122 BCE caused severe damage to the Roman city of Catania, which was subsequently exempted from taxes to Rome for a decade. A sub-Plinian eruption followed in 44 BCE.
The largest historical eruption occurred between 11 March and 15 July 1669, when a fissure opened near Nicolosi on the southern flank. The eruption was preceded by weeks of escalating seismic activity that destroyed Nicolosi and damaged numerous surrounding towns. The resulting lava flow reached the sea near Catania after covering approximately 17 kilometres, burying villages and partially penetrating the city. It was during this eruption that the first recorded attempt to artificially divert a lava flow took place: the priest Diego Pappalardo and fifty companions broke open the lava channel, initially succeeding in redirecting the flow, before being driven away by inhabitants of the threatened area. The eruption lasted 122 days and released over three million tonnes of sulphur.
In the twentieth century, significant eruptions occurred in 1908, 1910, 1911, 1918, 1923, 1928, 1942, 1947, 1949, 1950–51, and 1971. The 1928 eruption cut the railway circumnavigating the mountain and buried the village of Mascali. In 1983 a four-month eruption prompted authorities to use explosives in an attempt to divert lava flows.
Vegetation and landscape
The fertile volcanic soils on the lower slopes support extensive agriculture, including vineyards, citrus groves, and orchards that extend across the mountain’s base and the broad Plain of Catania to the south. The middle slopes are forested with chestnuts, oaks, and other species. The upper slopes give way to terrain covered in ash and sparse vegetation, and near the summit to a largely barren lunar landscape of volcanic rock. Within the Etna Natural Park, established in 1987, lies the Grotta del Gelo, a cavity in which a perennial glacier has formed at high altitude.
Source: Wikipedia (Italian/English) — Mount Etna; primary scientific data from INGV — Sezione di Catania, Osservatorio Etneo (ct.ingv.it)
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