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Transcript of Mount Ontake
Cause of Mount Ontake Eruption
The unexpected eruption of Mount Ontake was caused by a "steam explosion." The water located inside the volcano was super heated; evaporating it to steam. This sudden pressure pushed onto the surrounding rock surface; causing Mount Ontake to explode. This explosion is known as a "hydrothermal explosion" or a "phreatic eruption." There were no typical tremors before it erupted. The last eruption occurred on the 27th of September 2014. Mount Ontake exists because Japan lies relatively near a tectonic plate.
Mount Ontake erupted unexpectedly and caused countless problems. At this moment, scientists do not know if it will erupt again soon in the future.
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Comparison of Volcanic Statistics
In comparison to Mount Sinabung (stratovolcano), Mount Ontake’s destruction and aftermath are considered minor.
The economic effects of Mount Ontake are the following:
The final death toll was 57 people. More than 30 people were injured.
Both people and buildings were covered in ash causing major causalities.
The eruption was unexpected meaning that the neighboring locations were not prepared for such devastation. Villagers and hikers barely escaped the disaster.
More than 1100 firefighters, police officers and medical professionals came to the scene to scavenge for any survivors. Helicopters were deployed to maximise the possibility of rescuing trapped victims.
Ash littered mountain lodges needed to be cleared.
People could not step within a four kilometre radius of the crater.
Ski resorts could not operate during these times.
Japanese hotels and restaurants were struck with cancellations.
All of these points were massive blows to the economy and society.
Mount Ontake posed numerous environmental impacts on the neighbouring areas of Honshu. The ash flow created by the composite volcano imprinted a long lasting impact. When a composite volcano erupts, violent clouds of ash and slow moving lava are given off. In addition, these explosive eruptions also produce deadly "pyroclastic flows." All these attributes damaged the surrounding area of the explosion as it destroyed most things in its trajectory with it's superheated fragments. Emitted waves of these burning chemicals destroyed habitats and increased animal death tolls.
On the other hand, the ash and pyroclastic flows are laced with minerals and elements that act as a fundamental fertiliser. Although the initial force was devastating, some of the aftereffects were rewarding. A thin layer of ash will make the soil fertile and rich in elements such as copper, iron, cobalt and other minerals.This renewal allows plants to prosper once more.
Cause of Mount Ontake Eruption