Geohazard dynamics in Kumaon and Garhwal regions of Uttarakhand Himalayas: a critical review of trends and socio-environmental impacts
摘要
This review offers a comprehensive understanding of the catastrophic events that have occurred in the Kumaon and Garhwal Himalayan regions of Uttarakhand, India, during the past few decades. The state of Uttarakhand is marked by intracontinental thrust systems from south to north, namely the Himalayan Frontal Thrust (HFT), Main Boundary Thrust (MBT), North Almora Thrust (NAT), Main Central Thrust (MCT), and South Tibetan Detachment System (STDS)/Trans Himadri Fault (THF). The presence of these major thrust systems makes the region tectonically sensitive. It has been observed that the intensity of natural disasters in the Himalayas, such as landslides, flash floods, avalanches, and cloud bursts, has increased significantly in the last few decades along these major thrust systems, making a large area of the state a disaster-prone zone. This paper presents a critical review of major geohazards that occurred in the Uttarakhand state between 1906 and 2025, resulting in large-scale damage. Studies suggest that a complex interaction of tectonic, climatic, and anthropogenic factors primarily triggers recurring catastrophic events held in the region. This comprehensive review systematically compiles data on both pre and post events conditions of major geohazards and examines their key factors. The findings enhance understanding of recurring geohazards and offer valuable insights to strengthen future disaster preparedness as well as mitigation strategies.