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Land subsidence

  • IASbaba
  • January 10, 2023
  • 0
Geography
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Context: The exact reason behind Joshimath land subsidence is still unknown but experts cite unplanned construction, over-population, obstruction of the natural flow of water, and hydel power activities as possible causes.

About Land Subsidence:

  • According to the National Oceanic and Atmospheric Administration (NOAA), subsidence is the sinking of the ground because of underground material movement.
  • Reasons can be manmade or natural:
    • removal of water, oil, or natural resources, along with mining activities
    • Earthquakes
    • Soil erosion and
    • Soil compaction

Reasons behind Joshimath subsidence:

  • unplanned construction,
  • over-population,
  • obstruction of the natural flow of water and hydel power activities.
  • the area is a seismic zone, which makes it prone to frequent earthquakes.
  • the subsidence in Joshimath might have been triggered by the reactivation of a geographic fault —
    • defined as a fracture or zone of fractures between two blocks of rock — where the Indian Plate has pushed under the Eurasian Plate along the Himalayas.

Source:   Indian Express

 

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