Question

Describe fault with the help of an example from peninsula plateau of india

Answer 1

We present observations of active faulting within peninsular India, far from the surrounding plate boundaries. Offset alluvial fan surfaces indicate one or more magnitude 7.6–8.4 thrust-faulting earthquakes on the Tapti Fault (Maharashtra, western India) during the Holocene. The high ratio of fault displacement to length on the alluvial fan offsets implies high stress-drop faulting, as has been observed elsewhere in the peninsula. The along-strike extent of the fan offsets is similar to the thickness of the seismogenic layer, suggesting a roughly equidimensional fault rupture. The subsiding footwall of the fault is likely to have been responsible for altering the continental-scale drainage pattern in central India and creating the large west flowing catchment of the Tapti river. A preexisting sedimentary basin in the uplifting hanging wall implies that the Tapti Fault was active as a normal fault during the Mesozoic and has been reactivated as a thrust, highlighting the role of preexisting structures in determining the rheology and deformation of the lithosphere. The slip sense of faults and earthquakes in India suggests that deformation south of the Ganges foreland basin is driven by the compressive force transmitted between India and the Tibetan Plateau. 

Answer 2

The triangular shaped Peninsular Plateau of India extends from the south of Indo-Ganga Plain to the Cape Comorin (now Kanyakumari). This plateau is one of the oldest surfaces of the Earth and represents a segregated part of the old Gondwanaland.

Physical features:
The Aravalli range in the west and the Satpura, the Mahadeo and the Kaimur range in the south divide the Peninsular Plateau into two parts:



(i) The Central Indian Plateau in the north and (ii) The Deccan Plateau in the south of it. A brief account of them is given below:

Central Indian Plateau:
The Aravalli mountain, extending between Delhi and Ahmedabad (also Amdavad) , lies in the western flank of the plateau. Once a mighty fold mountain, it has been reduced now to a low one by denudation through hundreds of millions of years.

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