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Mt. Unzen, Japan

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Bryce Garner

on 7 February 2013

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Transcript of Mt. Unzen, Japan

Mt Unzen, Japan Mt. Unzen's History How often has it erupted?

Over actually recorded history, the answer is as follows: 1663, 1792, 1990/1991 almost continually to 1994/1995. When did eruption begin?

Mount Unzen is part of Shimabara Peninsula, which has seen extensive volcanism over thousands of years. The oldest volcanic deposits in the region date from over 6 million years ago, and extensive eruptions occurred over the whole peninsula between 2.5 and 0.5 million years ago. Were deaths and damage common with Mt. Unzen's eruptions?

Deaths and damages are not "Common" with the eruptions of Mt. Unzen; however there are a few instances such as the 1792 eruption which killed an estimated 15000 people. This lack of damage and death is in partly due to the volcanoes explosive and quiet eruptions Introduction Interesting point

Unzen (complete name Unzendake) is a volcano in Japan. Unzen means hot springs (the Unzen area is rich in hot springs)Dake or gake means sharp peak

Hence Unzen-dake means hot spring mountain. Location information

Mt Unzen is located in the country of Japan near Shimabara in the Nagasaki Prefecture on the island of Kyūshū. There is a graben extending across the peninsula it covers. A graben occurs at a normal fault where the hanging wall has moved down and the foot wall has moved up.
It is located at Longitude: 130° 19' 45"; Latitude: 32° 45' 31." At this location, the Pacific and Philippine tectonic plates are subducting under the Eurasian plate. This subduction causes those underlying plates to melt and create magma. THESIS STATEMENT

Mount Unzen is an active volcanic group of several overlapping stratovolcanoes, near the city of Shimabara, Nagasaki Prefecture, on the island of Kyūshū, Japan’s or the southern most main island of Japan. This in depth analysis of the history, physical information, modern events, & the human impact of the composite volcano; Mt. Unzen. Physical Information When this volcano erupts, what are the eruptions like?

These volcanoes potentially produce the volcanic hazards such as pyloclastic flows, lahar,volcanic bombs, ash falls potentially that travel faster and longer distances. Because Japan volcanic-arc is linked to the Cascade Volcanic-arc by the Ring of Fire, the volcanic hazrds in Japan are very similar to the hazards in the Cascade volcanoes, for example Mt. St. Helens eruption in1980. Some of those volcanoes are located near highly populated areas. People in areas often face to the serious volcanic hazards when the volcanoes erupt, for example Unzen and Sakura-jima volcanoes. What type of plate boundary is the volcano formed on?

Mount Unzen has a Converging Plate Boundary.
It is located on the boundaries between Philippine and Eurasian plates. Explosive Index(1900-1995)

The total damages caused by the Unzen eruption from 1990 to March 1995 are as follows:
Number of pyroclastic flows: At least 10 000 small ones
Number of people dead / injured: 44 dead (and missing), 10 injured
Buildings damaged: 2593 (including 1,270 residential)
Agricultural and fishery facilities: 17.4 billion yen
Public structures: 29.5 billion yen
Agricultural and dairy products: 20.0 billion yen
Commercial and service facilities (esp. tourism): 133.7 billion yen
Others: 4.1 billion yen
Total: 204.7 billion yen What type of volcano is it?

Mt. Unzen is classified as a complex stratovolcano or a composite volcano. Besides lava, do other what other types of volcanic material results when Mt. Unzen erupts?

Pyroclastic flows, lahar's( Mudslide/landslide), volcanic bombs, and ash clouds Modern Events When was the volcanos most recent eruption?

Mt Unzen's latest eruption was in 1991 during it's 1990-1995 activity. During this time, a lava dome was formed at the summit. The 1991 eruption forced over 10,000 people and killed 43 people by a pyroclastic flow. Was the most recent eruption expected? If so, why? If not, could it have been predicted?

No, the most recent eruption was a long serues of eruptions from around 1990-1996, however the intiual eruption was not predicted by volcanaolisgists How could modern technology have helped reduce damage or deaths related to thesevolcanos eruptions?

Modern technology wouldnt of helped the sorrounding citizens, due to the time period of the eruptions. By Bryce Garner
2 Period Human Impact What was life like during the volcanic events?

The disaster devastated the area's economy. Apart from the damages listed above, the transportation system was severely damaged by pyroclastic flows and mudflows. The restrictions issued for protection affected traffic conditions in the area, adding more income losses. The total damages caused by the Unzen eruption from 1990 to March 1995 are as follows:

Number of people dead / injured: 44 dead (and missing), 10 injured
Buildings damaged: 2593 (including 1,270 residential)
Agricultural and fishery facilities: 17.4 billion yen
Public structures: 29.5 billion yen
Agricultural and dairy products: 20.0 billion yen
Commercial and service facilities (esp. tourism): 133.7 billion yen
Others: 4.1 billion yen

Total: 204.7 billion yen How did the volcanic event change the life style of the people?

The area has suffered from the disasters for more than five years, which is a relatively long time for a person to endure a natural disaster. People who lived in the area had no choice but to evacuate. All the activities were forced to halt without any guarantee for legal compensations. After the initial volcanic threat in May 1991, 12 000 local residents were evacuated. What have you learned as a result of this project?

I learned from this project that at all time you should respect the power and massive energy that a volcano can produce. However it also showed me that even though this potential natural disaster can help in many ways, and that cultures have built and used the natural products from the volcano to progress forward and sustain life. Has your opinion about volcanic eruptions changed? How?

No, my opinion on volcanic eruptions has not changed due to this project. Conclusion What information about Mt. Unzen surprised me?

The information i learned that surprised me was that my chosen volcano caused the death of 15000 people in 1792, along with the fact that Mt. Unzen has the potential energy to cause a massive tsunami.
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