Failure mechanism of rangvamual landslide, Aizawl, Mizoram, India

Rahul Verma, Rao Ch. Udai Bhaskar, Blick John, Maipelo Gaopatwe, Malsawmtluanga

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Mizoram is one of the most landslide prone states of India. The prime causes of the landslides in Mizoram, can be listed as rugged topography, sedimentary geology, steeper slopes, rainfalls and seismicity. The failure mechanism of the present slide has been revealed based on integrated analyses of field database, GIS database (Satellite Data IRS P6/ LISS4-5.8 Mts. Resolution) using ARCGIS 9.3. The fault and fracture buffer show very high activity. Alarmingly, the slide section is spotted on an active fault trending NE-SW. The slide section is forming a dip slope, with an angle varying between 37o – 39o. “Rose/Stereonet diagrams” plotted for the beds of the slide section show a “mean direction-272.5° by Limit Equilibrium Method (LEM) analysis by Slide 6.0 software method found factor of safety of 0.719 by Bishop simplified method .and 0.706 for Janbu simplified method. These values fall much below the acceptable limit for a safe slope (>1.2).With all the evidences accumulated through field/ LEM/GIS based study conducted on the slide section and conclude that “Rangvamual Landslide” is a case of ‘dip slip failure’ and it is sitting on an active fault. It is strongly recommended that authorities proclaim the area as No Development Zone.
Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalDisaster Advances
Issue number3
Publication statusPublished - Mar 2021


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