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Gupta, Vikram
- Spatial Distribution pf Landslides Vis-à-Vis Epicentral Distribution of Earthquakes in The Vicinity of The Main Central Thrust Zone, Uttarakhand Himalaya, India
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 12 (2021), Pagination: 1927-1932Abstract
Landslides and related mass movement activities along with earthquakes are common in the Himalayan terrain. The distribution of seismic activities in the vicinity of the Main Central Thrust (MCT) is well known. However, in order to assess the relationship between these seismic events and landslides, the spatial distribution of landslides and earthquake events (magnitude >1.5) on either side of the MCT zone was evaluated. It has been observed that seismic events of magnitude <2.1 are clustered around the 1991 Uttarkashi earthquake rupture, 1999 Chamoli earthquake rupture and around Munsiyari. The zone surrounding 1999 Chamoli earthquake rupture indicates the highest earthquake and landslide density of ∼75% and 53% respectively.Keywords
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References
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- Regional-scale landslide susceptibility assessment for the hilly state of Himachal Pradesh, NW Himalaya, India
Abstract Views :83 |
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, India; Present address: Department of Geology, Sikkim University, Gangtok 737 102, IN
2 Wadia Institute of Himalayan Geology, Dehradun 248 001, India; Department of Geophysics, Kurukshetra University, Kurukshetra 136 119, IN
3 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
4 Uttarakhand Landslide Mitigation and Management Centre, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun 248 001, India; Present address: Department of Geology, Sikkim University, Gangtok 737 102, IN
2 Wadia Institute of Himalayan Geology, Dehradun 248 001, India; Department of Geophysics, Kurukshetra University, Kurukshetra 136 119, IN
3 Wadia Institute of Himalayan Geology, Dehradun 248 001, IN
4 Uttarakhand Landslide Mitigation and Management Centre, Dehradun 248 001, IN
Source
Current Science, Vol 125, No 12 (2023), Pagination: 1369-1380Abstract
Himachal Pradesh (HP), one of the 11 states of the Indian Himalayan Region, has a prolonged history of landslides and related mass-movement activities. In recent years, landslide incidences have increased significantly in the state due to changing climatic patterns and enhanced anthropogenic interventions. Therefore, to understand the spatial distribution of landslide-prone zones, regional-scale landslide susceptibility mapping for the entire state has been carried out using two bivariate methods, i.e. weight of evidence and information value. The results depict that 25–30% of the total area of the state is confined in the high to very high landslide susceptible (LS) zones. These are dominantly confined to three regions: Kinnaur, Lahaul, Chamba and upper Kangra. It is also ascertained that a higher percentage of high and very high LS zones are located at an elevation of 2000–4000 m and on the slopes facing south with an inclination ˃40°. Moderate and low to very low LS zones comprise ~27% and ~43–48% of the total area respectively, and are confined to the Outer and Lesser Himalaya. These maps were validated using the success rate curve and prediction rate curve, indicating that both models have more or less similar efficiency and accuracyKeywords
Anthropogenic interventions, bivariate methods, hilly areas, landslides, susceptibility assessmentFull Text