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Chapter 13 earth systems volcanoes
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The volcano of Mount Etna has been on this earth for about 500,000 years and is still currently active. This volcano is located on the east side of Sicily, Italy and stands 10,900 feet tall with a base circumference of 93 miles; it also still has a series of eruptions dating back to 2001. Mount Etna is considered a stratovolcano which means it’s built on top of many layers of lava and ash made from previous eruptions. What makes this volcano so unique is that it has many eruption styles ranging from extreme violent ones to regular lava just flowing from the mouth of it. About “25% Sicily 's population lives on Mount Etna 's slopes.” Etna stands tall above Catania which is a city on the island of Sicily. This stratovolcano plays a major influence …show more content…
The most powerful eruption ever recorded was in “1669, when explosions destroyed part of the summit and lava flows from a fissure on the volcano 's flank reached the sea and the town of Catania, more than ten miles away.” This eruption also paved the way for the way the lava flows from it now however; so when the town was destroyed they rebuilt around the flow of the lava to make sure they’ll be safe. In the year 1775 it erupted again but this time producing big lahar’s, which is a destructive mudflow on the slope of the volcano. “An extremely violent eruption in 1852 produced more than 2 billion cubic feet of lava and covered more than three square miles of the volcano 's flanks in lava flows. Etna 's longest eruption began in 1979 and went on for thirteen years; its latest eruption began in March 2007, and is still …show more content…
This specific volcano however holds the record for longest continuous eruptions. “Mount Etna is a series of nested stratovolcanoes with four distinct summit craters. There are two central craters, called Bocca Nuova and Voragine; the Northeast crater; and the newest Southeast crater, which was formed by an eruption in 1978.” The reason why tectonic plates are so important is because they are the reason how most mountains are formed. The African tectonic plate is major for Africa because it stretches across the entire continent straddling the equator as the prime meridian. It also stretches across some oceanic crust which “lies between the continent and various surrounding ocean ridges.” The African plate actually has 6 major other plates connected to it as well, but Mount Etna is located in the North, on the Eurasian
...e than 30 volcanoes that have erupted over the past 300,000 years in the Lassen Peak volcanic area.
The ejecta from the eruption moved over land and through the air: the ash that fired out of the volcano was blown as far east as Nebraska in a huge, dark cloud of plinian ash. A nuee ardente billowed over the rim of the volcano and spread lava to the south, east and north, forming a volcanic outcrop now called the Bishop Tuff. Today, an expanding resurgent dome in the center of the depression indicates current magmatic activity beneath the caldera, and earthquake swarms in the last 25 years could also be linked to subsurface magma movement. Clearly, the Long Valley caldera is not dormant, so understanding the eruption that formed the caldera and surrounding features is essential to assessing the region's current and, more importantly, possible future activity.
When the plates mash together on a convergent boundary, they can create an earthquake. A place with a convergent boundary is New Zealand. When the plates pull apart, a divergent boundary, they create a hole in the ocean that causes molten lava to rush up and it causes a volcano to form. A place with a divergent boundary is Iceland. With about 130 volcanoes all together, it has the most volcanoes of any country in the world and is on two tectonic plates. Santorini is currently in an area of earth where the African and Eurasian plate meet, and Atlantis disappeared with a rumble that could have come from a volcano or an
Mount Tambora, located on the Island of Sumbawa, Indonesia is classified as a Stratovolcano. Also known as a composite volcano, Tambora is a tall conical volcano (cone like structure) where layers of the walls are built by hardened lava and volcanic ash. The term composite is used to describe the volcano due to the composite layered structure built from sequential outpourings of eruptive materials1. Among the most common types of volcanoes, Tambora also shares its destructive prowess with best-known volcanoes such as Krakota (1883) and Vesuvius (79 A.D). The Island of Sumbawa is located in the middle of the Lesser Sunda Islands chain (a group of islands in the southern Maritime Southeast Asia) and is in the province of West Nusa Tenggara3. A map of Mount Tambora is shown in Figure 1 to provide a better perspective of its location. Interestingly enough, Tambora forms its own peninsula on Sumbawa, known as the Sanggar Peninsula. In April of 1815, after years of dormancy, Mount Tambora erupted with great intensity, approximately 7 on the volcanic explosivity index, which is shown in Figure 2. It has been estimated that the eject volume of Tambora was 160 cubic kilometres, which represents the largest volcanic eruption in recorded history. The death toll has been projected to be at least 71,000 people, of who over 15% were killed directly from the eruption1. The remaining 75% have been thought to succumb to starvation and disease, as the eruptive fallout decimated the agricultural industry in the region. Following the eruption, a volcanic winter ensued. As sun become less abundant due to clouds of ash, crops and livestock perished. Please note that all definitions appearing in the footnotes are either taken from already referenced so...
Mount Vesuvius is located in the Bay of Naples in Southern Italy. Its Latitude and Longitude is 40.8224° N, 14.4289° E. It is a stratovolcano and has a height of 1277 meters (1490 feet) and base of 48 kilometers (30 miles). Mount Vesuvius has erupted over 30 times and has a repose time that can last for months or even years between eruptions. Its eruptions are explosive and is dominated by pyroclastic flows. The eruption materials are usually an ash cloud with lightening that spews out dense ash falls. The lava can shoot up to 4km into the air. The most famous eruptions of Mt. Vesuvius were in 79 A.D. which destroyed the cities of Herculaneum and Pompeii. The cities were covered in 20 feet of volcanic debris. The estimated death toll was over 1000 people. The
Volcanism is a major part of the Galapagos and their formation. The island chain is positioned on the Nazca Plate, which is subducting beneath the South American Plate at a geologically rapid pace of 2.5 inches per year. In addition, this Nazca Plate is located directly on top of the Galapagos Hotspot. It is here that mantle plumes melt Earth’s crust, creating volcanoes as a product. The oldest island was first shaped by this ...
First you might need to know definition of tectonics. It is a theory in geology. The lithosphere of the Earth is divided into a small number of plates which float on and travel independently over the mantle and much of the Earth’s seismic activity occurs at the boundaries of these plates. That is the official definition of Plate tectonics. secondly, this plate covers many parts of continents. plate boundaries don’t go according to Continents boundaries, they make their own boundaries. The North American plat...
Over the centuries, the making of the Big Island as we know it today eventually entailed the growth and conjoining of six separate volcanoes, building all the way up from the seafloor, some 18,000 feet below the ocean’s surface. These volcanoes, from northwest to southeast, are named Mahukona, Kohala, Mauna Kea, Hualalai, Mauna Loa and Kilauea, and become younger as one moves north to south. Mahukona Volcano, just off the Big Island’s northwest coast, was the first volcano to start forming. Now submerged beneath the surface of the ocean because it is sinking into the Earth’s crust under its own vast weight, Mahukona is no longer visible. As the Pacific Plate slowly continued moving northwestward over the hotspot, the location of the rising magma moved relatively southeastward, and through time the rest of the Big Island volcanoes formed along that path.After Mahukona, Kohala Volcano, the precursor to today’s Kohala Mountain, erupted next. As Kohala Volcano emerged from the sea and joined with Mahukona, a much larger Big
Volcanoes. The naturally forming landforms that can look remarkably beautiful. Gentle slopes, or high rising heights with snow caps and greenery that seems to attract many tourists and sightseers around the world. These magnificent landforms can also cause major destruction and can produce forces that can explode, burn, and create a great deal of damage. Two of these extravagant wonders of the world is the Mount Saint Helens composite volcano in Washington, US, and the Mauna Loa shield volcano in Hawaii, US. These landforms have a eruption history of many colors. One has a great power in eruption, but another has a eruption that is quiet and gentle. In comparing these two volcanoes there are many likes, and dislikes, to consider. So the following
Stories about volcanoes are captivating. Myths come in different versions, but all of them are capable of capturing yours, and everybody’s imagination.
Rocks are hard but in time they can bend or fold producing folded mountains. The Alps formed as the Eurasian plate pushed against the African plate. Other examples of folded mountains are the Rockies, Himalayas, Appalayas, and the Andes. Fault-block mountains are formed when one plate pushes or pulls away from another plate. On the Earth, hot currents of magma or molten rock may well up and crack the weakened crust above.
Named for the Roman god Vulcan, volcanoes have both intrigued and frightened mankind for centuries. Human-like footprints dating back 300,000 years have been found in the solidified lava of Roccamonfina volcano in Italy (Onion, 2013). These footprints, called the "Devil's Trail" appear to indicate that these ancestors were escaping an eruption. In Turkey, a 9,000 year old painting depicting a volcanic eruption was discovered in 1964 during an excavation of Catalhyuk (Oskin, B., 2012). Perhaps one of the most famous written accounts of a volcanic eruption was written in 79 A.D. when Pliny the Younger wrote of the eruption of Mount Vesuvius in Italy.
However, this chronological realignment does not mean that the eruption of Santorini had nothing to do with the Minoan collapse. Most obviously, the island of Thera, which the Minoans probably used as a trading centre or stop-off, was totally destroyed. This would have caused huge problems for the Minoan’s trading empire.
Volcanoes are formed when magma is expelled from the Earth’s surface, resulting in volcanic eruptions consisting of ash and lava. Over time, the lava cools and forms into rock on the Earth’s surface. Whenever an eruption occurs, the newly-formed rock from the lava layers continuously until the volcano takes its shape. Volcanic eruptions have taken place for thousands of years, and even today, according to the U.S Geological Survey (2010), there are approximately 1500 active volcanoes located throughout the world.
Mount Vesuvius is a volcano located in southern Italy, near the bay of Naples and the city of Naples. It is the only active volcano on the European mainland. Vesuvius rises to a height of 1277 m (4190 ft). Vesuvio (Vesuvius) is probably the most famous volcano on earth, and is one of the most dangerous.