Volcanoes have played a key role in forming the face of the earth as we know it today. Some of the most well known landmarks and locations in the world are volcanoes. From the Hawaiian Islands to Mount Vesuvius, the Earth is populated with hundreds of active and dormant volcanoes. Among these volcanoes there are multiple different types. Stratovolcanoes, the most dangerous type of volcanoes, are built by multiple eruptions over many years.
Volcanoes Volcanoes are natural phenomena which are on the Earth’s surface through which molten rock and gases escape from below the surface (Tarbuck, 139). These volcanoes are very interesting to observe and to study because of their amazing occurrences and majestic lava eruptions. Volcanoes have been studied ever since the beginning of mankind and the word “volcano” is thought to be derived from Vulcano, a volcanic island in the Aeolian Islands of Italy whose name in turn originates from Vulcan, the name of a god of fire in Roman mythology. Consisting of several types, volcanoes can extrude several forms of magma and can also release multiple gases. These extruded materials can affect the Earth’s structure and atmosphere.
The activity of the volcanoes varies , for example, Vesuvius will continue in a state of moderate activity for long or short time periods and will then become stagnant or in-active for months. If an eruption succeeds prolonged dormancy it will usually be fairly violent, as was the eruption of Mount Saint Helens after 123 years of stillness. The potential danger of an active volcano can be seriously threatening to civilization for more reasons than just the initial eruption of molten rock, disasters, such as mud flows, triggered by an eruption are also serious hazards. Composite cones are formed from a combination of eruptions. First the volcano will have an explosive eruption that ejects huge amounts of steam, gas, and ash.
Crater Lake is constructed of different types of volcanic rock, has been a part of different eruptions and has had much activity since it was once Mount Mazma. Due to the volcanic threats that are still provided from the lake and its surrounding cinder cones, hazard mitigation, monitoring and monitoring is vital to nearby locations. All of these important topics will be discussed further in the continuing paragraphs. Geological History: Before Crater Lake was indeed Crater Lake, it was once a 12,000 foot high stratovolcano known as Mount Mazma. Mt.
Volcanoes are magnificent and powerful land features. The magma erupts from the Earth forming islands, cooling to form rocks, and changing the landscape on eruption at a time. They can erupt at any time! Since volcanoes are dangerous we have developed technology to detect these impressive explosions. Since Hawaii was formed by a volcano when you visit Hawaii you are standing on cooled lava!
After significant time, the hard lava forms a volcanic mountain. Volcanoes can form in many different sizes and shapes. They can look like a cone, have steep looking flanks, or look as if they were long cracks in the earth’s crust. (Plummer et al., 2000). If the mountain is very tall, then there is a greater chance that it was formed from past eruptions.
Mono Basin Volcanism The last basin in the Basin and Range before the Sierra Nevada Mountain range is the Mono Basin. The Mono Basin consists of landforms such as the Mono-Inyo Craters, Black Point, Negit Island, Paoha Island, Mono Lake, Devils Punch Bowl, Panum Crater, and some others (Hamburger et al; 2004). All of these landforms were created by volcanism. Actually, the Mono Basin is in one of the most volcanically active places in the world (Forest Service; 2004). Paoha Island, Negit Island, and Panum Crater are the most recent volcanoes to erupt, which are the furthest north in the basin.
Accomplishing this daunting task will ensure that in the future when an eruption occurs, the population at risk will be prepared and lives can be saved. Numerous methods are available for monitoring volcanic activity, and scientists typically synthesize data and observations from all methods available in order to obtain the most comprehensive look at the area being observed. One frequently used technique is monitoring seismic activity that may indicate flow of magma and gas beneath the surface. As magma at extreme temperatures of sometimes over one thousand Degrees Celsius rises through cracks in the Earth's crust, the intense temperature and pressure causes the surrounding rock to crack, as illustrated in the diagram above. This brittle fracture of the surrounding rock often causes earthquakes or vibrations called tremors.