Acicastello and Acitrezza

The first Etnean volcanic events between Aci Castello and Aci Trezza

Aci Castello and Aci Trezza are two small towns along the Etnean coast, located between the two larger settlements of Catania and Acireale. Their origins are mainly linked to settlements of fishermen, as shown by the literature about this area and the ever-present folklore traditions .
The first phases of Etnean volcanic activity developed around 500,000 years ago from a system of faults and fractures located in the current lower flank, in the area between the villages of Aci Castello and Aci Trezza.
At that time, the area where Etna now stands was partly occupied by a gulf where underwater eruptions occurred. The cliff of the Aci Castello castle is a classic example of this kind of underwater activity, in a shallow seabed almost at the surface of the water.
La rupe di AcicastelloIn fact, the cliff is simply a platform of “ pillow lavas ”, on which a deposit is superimposed due to small underwater volcanic explosions which, in volcanological terms, are called hyaloclastite breccias . In front of the coast of Aci Trezza is one of the most fascinating places on the Etnean coastline, with the presence of Lachea island and the Stacks.
faraglioni di AcitrezzaIn these places it is possible to observe Etna’s volcanic products alternating with clay: the latter is only deposited in the marine environment, and further demonstrates Etna’s underwater activity.
This is one of Etna’s most fascinating places, which shows how A’ Muntagna has changed profoundly over time, from its birth to its current volcanic activity.

Empedocles and his passion for Etna

The 1669 eruption in Catania

Etna: a marvellous group of microclimates and vegetation

The senses tell The Red Mountains


A fauna context yet to be discovered

An ever-evolving volcano

The different names of the “Muntagna”

The earthquake that changed the geography of eastern Sicily in 1693

Etna, wine terroir of excellence

The Elliptical, the first great volcano of Etna

Why did Etna form in that specific geographical position?

The senses tell Valle del Leone

Acireale and reconstruction after the 1693 earthquake

Torre del Filosofo: at the base of the summit craters (2950 metres)

The continuous evolution of the Etna summit craters

The senses tell Val Calanna

Humankind and the volcano: how should we behave? Volcanic risk

The senses tell The Etna viewpoint

The 2001 eruption of Mount Etna, where the approach to volcanoes changed

Summit crater activity between 2011 and 2019

The fault system of the “Timpe” of Acireale

The Jaci river

Etna, the living mountain

The Red Mountains and the destructive eruption of 1669

Etna, an ever-changing natural laboratory

The senses tell The Summit craters

The Etna viewpoint

The eruption of 1928 that destroyed the town of Mascali

Valle del Leone and the Elliptical

The senses tell Acireale

The “notches” of snow

Val Calanna, the first step towards a single large volcanic structure

Lachea Island and the Aci Trezza Stacks

Acireale and its “timpe”

The senses tell Acicastello and Acitrezza

The senses tell Torre del Filosofo

Volcanic monitoring and eruption forecasting

The first Etnean volcanic events between Aci Castello and Aci Trezza

The Grand Tour in Sicily