Disadvantages of volcano

1.Loss of life

2. Loss of property

3. Loss of homes

Case Study 1

The eruption of Mount Pinatubo in the Philippines in 1991 released large amount of ash which combined with rain water to produce a thick mudflow. The mud killed nearly 900 people and buried thousands of buildings and over 40, 000  ha of farmland in the surrounding area.THE LOCATION OF PINATUBO

THICK MUD FLOWLOSS OF PROPERTY AND HOMES

Tsunami

Volcanic eruption can also produce huge waves in the ocean called Tsunami. These waves can be destructive.

FORMATION OF TSUNAMI

TSUNAMI

Case Study 2

In 26th Dec, 2006, the earthquake was caused by subduction and triggered a series of devastation tsunamis along the coast of most landmasses bordering the Indian ocean, killing nearly 230, 000 people in fourteen countries and inundating coastal communities with waves up to 30 meters high. It was one of the deadliest natural disaster in recorded history. Indonesia, Sri Lanka, India and Thailand were the hardest hit.

TSUNAMI 2006

FORMATION OF TSUNAMI

THE FORMATION  OF TSUNAMI

Seismic disturbances, volcanic activities, submarine faulting are the main reasons for occurrence of Tsunami. A seismic disturbance can move the seawater causing a rise or fall in the level of the ocean. The seismic disturbance occurs due to displacement of tectonic plate. This rise or fall in sea water level is the early formation of a tsunami wave. This wall of water sometime turns out to be more than 100 feet height. The earthquakes that take place on the seafloor or in coastal areas usually cause tsunamis. The energy produced by the earthquake is transmitted through the water causing violent movement of sea waves.

Advantages of volcano on human impacts

For Farming– Volcanic soil ( ash & lava) is the most fertile soil and produce high yields. Farming usually done on the slope which are terraced. Example- Java, Indonesia Some of the best farmland.

Terraced farming in Java, Indonesia

For Mining– Volcanic areas are rich in mineral resources such as sulphur, copper and tin. Example, Bougainville ( Papua New Guinea) the world’s largest copper mines.

MINING AREA

For Geothermal Power–  Steam from the hot springs can be generated electricity. Example- New Zealand, numerous geothermal power station.

GEOTHERMAL ENERGY

For Tourist attraction– The famous geyser, for example, in USA the Old Faithful, Yellowstone National Park. In Japan, Kagoshima famous for sand bathing.

OLD FAITFUL GEYSERSAND BATHING