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- 검색키워드
- 저자 : Khayingshing Luirei (검색결과 3 건)
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Khayingshing Luirei,Surendra S. Bhakuni,Limasanen Longkumer,Vipin Kumar,Imlirenla Jamir 한국지질과학협의회 2021 Geosciences Journal Vol.25 No.4
This paper documents the various factors contributing to the evolution of landforms in the Kosi River valley, Ukhaldhunga area of the Kumaun Himalaya, Uttarakhand. The area falls in the major tectonic boundary between the Lesser Himalaya and the sub-Himalaya. Passing through the Parewa-Ukhaldhunga-Dabara area, this tectonic contact is known as the Main Boundary Thrust (MBT), which is characterized by presence of varied landforms. Study of the development of geomorphology, particularly those evolved in the MBT zone, suggests that the morphological features are intimately associated with the tectonic activities related to the movement of rocks along the MBT and the surface processes such as fluvial and mass movement. The various landforms observed in the MBT zone include strath terraces, fill terraces, paleochannels and V-shaped valley that pertain to fluvial genesis; gravity induced landforms such as landslide debris and colluvial fans; and tectonic landforms such as linear fault traces, swerving/swing of river course and linear depressions. Signature of recent tectonic activity along the MBT is observed between Dabara and Khakrakot. The activity is evident in the form of 8-km-long active fault trace trending NW-SE. Normal fault related landforms are observed in the hanging wall block of the MBT. Neotectonic strath terraces and fill terraces are well developed in the MBT zone. Multiple events of recurrence of landslides are evident from exposed section of landslide debris fans. The bedrocks are highly sheared, suggesting successive tectonic movements along the MBT. As a consequence, tectonic wedges have developed in the bedrocks. These wedges have facilitated for the recurrence of a number of landslides. The anthropogenic activities have also aggravated the slope stability. Truncation of older debris fan surfaces by an erosional/fault scarp is observed and the scarp separates the older fans from the youngest debris fan deposit. The scarp runs parallel to the MBT and Kosi River. Swerving of the Kosi River is as a result of the tectonic forcing along active lineaments/faults. The trend of lineaments of the maximum and high density is NE-SW, which is transverse to the trend of the NW-SE trending Himalayan fold-thrust belt.
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Factors influencing the slope instability of the Mussoorie–Bhitarli area, Garhwal Himalaya
Khayingshing Luirei,Manish Mehta,Atif Iqpal,Safana Nazir,Girish Ch. Kothyari 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.3
Himalaya is one of the youngest mountain systems with a fragile ecosystem due to continued collision tectonics. The endogenic and exogenic processes in the Himalaya have made landslide one of the critical surface processes continually sculpting the Himalaya. Constituting the hanging wall of the Main Boundary Thrust (MBT), the south-facing slope of the Mussoorie Syncline is prone to various slope movements. Several old and active landslides are taking place along the Dehradun-Bhitarli Chhoti-Mussoorie road section. The main causative factors for landslides are tectonics, slopes, and human interference. The highly sheared bedrocks and high numbers of joint sets in the bedrocks are the signatures of the successive phases of tectonic uplift along the MBT imprinted on the bedrocks. The intersecting joint sets developed in the bedrocks have formed wedges, and these wedges have facilitated the recurrence of several landslides. Wedge failure, sliding (bedrock and debris), and toppling are the primary types of failure mechanisms, of which wedge failure-induced landslides accounts for the maximum. The south-facing slopes are very steep and are also one of the contributing factors to the instability of the hill slope. Anthropogenic activities have further aggravated slope stability as the roads are constructed across steep slopes and highly sheared rocks. The onslaught of rains easily destabilizes the weak rocks during monsoon, where the region receives a good amount of rainfall. The landslides occur primarily during or right after monsoon when the slope-forming materials become saturated with water. Recent tectonic activity along the MBT is evident from tectonic landforms such are uplifted terraces, linear fault traces along the MBT, and triangular facet cones.
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Manish Mehta,Rahul Devrani,Khayingshing Luirei,Vinit Kumar 한국지질과학협의회 2022 Geosciences Journal Vol.26 No.2
In the present study, we are reporting an unnamed glacier located (30.28089N- 80.69344E) in the upper Kali Ganga valley, Pithoragarh district, Uttarakhand, India, which has been affected by active fault and climate change. Recent tectonic activity and change in climatic conditions have changed the course and morphology of this glacier. An active fault has produced a fault scarp that measures about 250 m in height with a northerly dip, the fault trace is 6.2 km in length and trend towards NW-SE. The observation is based on the satellite image, toposheet and Google Earth images. We observed that the 5 km long unnamed glacier, which covered ~4 km2 area in Kuthi Yankti valley (Tributary of Kali River) has abruptly changed its main course. The NE moving glacier has been abruptly truncated and forced to move towards SE and ultimately merges with the adjacent glacier named Sumzurkchanki as a result of tectonic forcing. It is one of the unique behaviors of the glacier, which is for the first time reported from the Himalayan glacier as no such observation have so far been reported on this type of glacier kinematics. The study will help to understand the glacial-tectonic interaction and provides key information for future studies.
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