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Natural Hazards

, Volume 60, Issue 3, pp 1347–1363 | Cite as

Instability analyses of Merhülietsa slide, Kohima, Nagaland

  • Imtiwapang Aier
  • M. Pradipchandra Singh
  • Glenn T. Thong
  • Soibam Ibotombi
Original Paper
  • 145 Downloads

Abstract

Part of Merhülietsa colony of Kohima town and the national highway passing through it was devastated by a landslide on May 13, 2007. This unstable zone affected by rotational failure lies in the Disang sediments comprising shale with intercalations between thin-bedded siltstone and fine-grained sandstone. The shales are sheared, crumpled, and weathered to a high degree. This is attributed to a strike-slip fault and two shear fractures. Geotechnical analysis was carried out in the area and a factor of safety of 0.60 obtained for the slide mass. Similar work is extended to the surrounding area which had developed tension fractures. A slip circle drawn from tension cracks helps define future failure planes. A factor of safety of 0.93 is obtained indicating the possibility of progression of the slide zone. Rock mass rating of the shales surrounding the slide zone indicates poor rock condition, pointing to danger of collapse with further progression of the slide zone.

Keywords

Merhülietsa 179 km NH 39 Kohima Instability analysis 

Notes

Acknowledgments

The authors from the Nagaland University are grateful to the Department of Science and Technology, Govt. of India for a major project No: NR/LS(NE-5)/07 dated 29/10/2007. Special thanks are due to Supongtemjen, Research Scholar, Department of Geology, Nagaland University for help during fieldwork and preparation of diagrams.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Imtiwapang Aier
    • 1
  • M. Pradipchandra Singh
    • 2
  • Glenn T. Thong
    • 1
  • Soibam Ibotombi
    • 2
  1. 1.Department of GeologyNagaland UniversityKohimaIndia
  2. 2.Department of Earth SciencesManipur UniversityImphalIndia

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