Current Events Current Affairs Analysis
Separate studies conducted by eight premier institutions of India to know the cause of land subsidence in Joshimath town of Uttarakhand has been released.
Reasons/Factors causing sinking of Joshimath:
seismic activities
Joshimath town is situated on Vaikrita groups of rocks overlain by morainic deposits.
§Morainic deposits are composed of irregular boulders and clay of varying thicknesses.
§Such deposits are less cohesive and susceptible to slow subsidence and landslide subsidence
construction loopholes
Non-compliance with the National Building Code of India, 2016
population pressure
poor drainage system
Infiltration of rainwater/melting of ice/wastewater discharge from household and hotels causes subsurface drainage.
The Subsurface drainage created internal erosion .
slope instability as a result :
Seepage of local drainage water in the soil,
Terrain and edaphic characteristics
loose and unconsolidated moraine materials of the slope (due to old landslide) and
Flash flood events in and around the area in the recent past
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