Morphotectonic Aspects and Their Relationship With Landslide Prone Areas of Sairang River Basin, Aizawl, Mizoram, India

Morphotectonic Aspects and Their Relationship With Landslide Prone Areas of Sairang River Basin, Aizawl, Mizoram, India

ABSTRACT

Tectonic processes are responsible for the formation of different topographic expressions. During Tertiary, such series of tectonic activities formed the Mizoram Fold Belt region where Aizawl is situated. The study area is gone through adverse effects of landslides, rock fall, slumping and many other natural disasters. This study aims to demarcate not only some visible or active landslides but to understand the role of active tectonics and geological factors in creating vulnerable regions around the Aizawl city. The morphotectonic parameters and lineament analysis techniques able to indicate ancient slide zones and helped us to reveal the controlling factors associated with dynamic movement history and changing slide patterns. Morphotectonic parameters are delineated from data products that are used in the present study are topographic maps, satellite imageries, Digital Elevation Model (DEM), geological data collected from field investigation. Different lineament density plots (Rose Diagram) were prepared for the total lineaments delineated. Morphotectonic parameters, viz. Asymmetric Factor (AF), Transverse Topographic Symmetry Factor (T), Stream Length gradient index (SL), Basin shape indices (Bs) etc. were calculated. The parameters inferred that few landslides occurred because of slope failure but some other due to fault systems and weak lithologies associated with them and some other event have human induced causes. Therefore, the study could differentiate the natural and anthropogenic slide events. Many landslide events take place regularly in the area that fall under the high earthquake risk zone. The proper development and planning system is required for ensuring stability on the vulnerable hilly undulating landscapes.

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