Sunday, February 17, 2013

The Apennines and Stromboli?!?

Italy is certainly one of the most distinguishable land masses. Italy is one of the three largest peninsulas in Southern Europe at approximately  620 miles long. A peninsula is created when waves of water begin to erode the outsides of the land, causing the middle of it to become more prominent. Italy is surrounded by the Adriatic, Ionian, and Tyrrhenian seas which include Sicily and Sardinia. 

With that being said, Italy lies right at the meeting points of the Eurasian and African tectonic plates. These plates clash together and cause subduction right along the middle of the country. This creates the mostly sedimentary Apennine Mountains. These mountains are sometimes called the Italian Backbone because they span the length of the country.

Apennine Mountains
Parts of the Apennines are made from volcanic activity. When looking at the rock formations we can see huge chunks of basalt.

Basalt Pillows 
There are about 29 volcanoes in Italy, out of all of them, there are still 3 active volcanoes, and 3 volcanoes, with reported, but not confirmed activity in previous years. The most famous of Italy's active Volcanoes is Mount Vesuvius. Mount Vesuvius is an andesite, or composite volcano with a large and deep caldera which formed approximately 17,000 years ago after a massive explosion. Even though the volcano does little more than spout steam and gases, it is rich with potassium and phonolite, causing extreme explosions.
1944 Eeruption
Satellite View
Vesuvius Today
There is however, another famous volcano, Stromboli. I'm not meaning the tasty dish either, I'm meaning the awesome volcano that was the inspiration for Mordor in The Lord of the Rings. Stromboli is a highly active volcano off the coast of Sicily. It is known as the "Lighthouse of the Mediterranean" because of house visible it is. Stromboli is a Stratavolcano.
Stromboli Volcano off of Sicily
When looking at other rock formations like the gorgeous plateau, Pietra di Bismantova, scientists had discovered that this area used to be underwater and rose up out of the sea. Fossils can be found on the peaks, and the rocks matches those that had been found in the sea. The area used to be, at one point, in the lush tropical waters, as suggested by the fossils found. It almost looks like a hogback but I don't believe it is. 

Pietra di Bismantova

Tying back into the clashing of the tectonic plates however, some cities, such as Pisa, aren't exactly suitable for construction. The Leaning Tower of Pisa, was once straight, but due to liquefaction, part of the tower began to sink into the ground. Liquefaction is was the ground is really sandy and has just enough water under and in it to slowly pull things down. Quicksand is a keep form of liquefaction.

Leaning Tower of Pisa

When the plates crash together, the earthquakes shake up the soft sandy ground with the water and cause the ground to sink down in the areas around the earthquake. Such as during the earthquake that occurred in Italy last May where the streets began to sink in the sand.

The grounds aren't exactly stable and the the plates colliding isn't a good thing, but it still is a very beautiful place to live.

  

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