IAS (Admin.) Mains Geography Geomorphology-Vulcanicity Study Material (Page 3 of 6)

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Vulcanicity: Devastations Due to Volcanoes, Benefits from Volcanoes

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Devastations Due to Volcanoes

Volcanoes cause large loss of life and property.

  • Primary hazards include pyroclastic flows, air-fall tephra, lava flows, and volcanic gases.
  • Secondary hazards include ground deformation, lahars (mudflows) , landslides, and possibly tsunamis in ocean floor volcanic eruptions.
  • They cause air pollution and volcanic smog or vog. The constituent and harms of vog are same as that of smog (discussed in “Environmental Geography” ) .
  • Crop and soil damage due to lava flow, mudflow, and ashes.
  • Sulphur fumes rot metal structures.

Benefits from Volcanoes

  • Volcanoes gene…

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Vulcanicity: Distribution of Volcanoes, Major Volcanoes

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Distribution of Volcanoes

Volcanoes occur along weaker zone of earth crust. 15% volcanoes lie along constructive or divergent plate margin, and 80% volcanoes lie along destructive or convergent margins.

  • Intraplate Region: These include the volcanoes along Hawaii Island and fault zone of East Africa. These are active in middle of continental plates and were fo…

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