Mount Ontake is a volcano/mountain located in Honshu, Japan. On September 27th 2014, Mount Ontake mysteriously erupted, resulting in 63 deaths. It is Japan’s 14th mountain and 2nd highest volcano.This mountain was a prime sacred place. Mount Ontake was a place where people would visit as a religious belief. There are various monuments and items such as shrines and statues. The geomorphic hazard here is the mountain/volcano. A volcanic eruption consisting of a magma and lava occurs when a crack is current in the Earth’s lithosphere, and magma seeps through these cracks. The pressure built inside the earth is released causing magma and lava to explode out of the volcano. Mount Ontake is a different type of volcano: a stratovolcano. A stratovolcano is type of volcano built up of many layers of ash and lava. A stratovolcano’s eruptions are called phreatic eruptions. Phreatic eruptions work by water under the ground that boils creating steam. This will cause an explosion of steam and ash. Stratovolcanoes are capable of erupting without any signs.
Location of the geomorphic disaster.
Mount Ontake is located on the island Honshu in Japan. Japan is an archipelago, meaning it is a group of islands. Mount Ontake is in the southern end of the Northern Japan Alps. It is situated about 100 kilometres northeast of the city Nagoya and approximately west of Japan’s capital, Tokyo. Mount Ontake is found at the the borders of Kiso and ?taki, which both are located in the Nagano Prefecture , and Gero, which is located in the Gifu Prefecture. A prefecture is an area of a country/town that is under the power of a prefect, leader, or governor. Mount Ontake is located on a triple-plate boundary between the Eurasian continental plate and the Philippine and Pacific oceanic plate. A plate boundary is where two or more tectonic plates meet. All the volcanoes in Japan including Mount Ontake, “is part of the Ring of Fire, a string of volcanoes roughly circling the Pacific Ocean.”reference! Mount Ontake is found in Japan, on the the country’s main island, Honshu.
Impacts as A Result of the Geomorphic Hazard
The eruption of Mount Ontake occured on September 27th in 2014, causing 63 deaths. This eruption was Japan’s second most dangerous eruption since 1926. This powerful phreatic explosion killed these 63 victims in two ways: toxic gases and the pyroclastic flow. This was a phreatic eruption so there isn’t no eruption of fresh magma. Phreatic eruptions, like majority of other volcanoes, emit toxic gases such as carbon dioxide, sulfur dioxide, and many more types. These gases are created from magma. When the magma in the volcano is heated to the point of turning to gases, these toxic gases are formed. As the pressure builds up, these toxic gases burst powerfully into the air. The toxic gases are then spread around the atmosphere by wind. The other threat was the pyroclastic flows. Pyroclastic flows include snow, mud, and debris slides. These dangerous slides are created when the heat has melted the snow or other debris around the area, causing these these slides to rush down the volcano at extremely high speeds. Another pyroclastic flow involves rocks. When the volcano has erupted with great force, the rocks and boulders explode, flying in the air. Colossal amounts of ash were caught on the roofs of houses and other buildings, causing these buildings to collapse due to the weight.
How Could the Geomorphic Hazard Be Managed
The eruption of Mount Ontake was very difficult to deal with because this volcano is a stratovolcano. Stratovolcanoes are strenuous to predict because, it can erupt without any warnings such as minor earthquakes. Managing an eruption, involves taking multiple photos at different times of the eruption, so that the rescuers know what to do in the future. During and after the eruption, more than 500 rescuers, military, and police were sent in order to search for climbers trapped by the ash from the pyroclastic flow. Other solutions of rescue include helicopters. These helicopters’ roles are to rescue people that are much higher up the mountain or unable to walk properly due to the powerful pyroclastic flows. The management prior to the actual eruption was unpredictable. This was because stratovolcanoes like Mount Ontake are capable of erupting without any signs.
Mount Ontake, Japan’s 2nd highest volcano, is located in Honshu, Japan. The 2014 eruption caused 63 deaths due to the pyroclastic flows.