Magnitude 4.4 quake triggers glacier fall, kills hundreds, threatens barrier lake breach
Why in news: A magnitude 4.4 earthquake/landslide triggered a massive glacier fall near the Nepal-China border, causing a 100-km debris flow that destroyed hydropower projects and villages.
The event occurred on August 26 at an altitude above 5,000 metres in the Himalayas. Debris traveled through the Lhende Khola, Bhote Koshi, and Trishuli rivers, reaching Bihar, India. The USGS interpreted the seismic signal as a 'slope failure' equivalent to a magnitude 5.2 earthquake.
Prelims pointers (4)
- FactMagnitude 4.4 earthquake triggered the glacier fall on August 26.
- PlaceThe disaster affected the Nepal-China border and reached Bihar, India.
- EnvironmentThe event occurred in the Langtang National Park region.
- FactThe debris flow traveled a distance of 100 km through multiple river systems.
Mains angle
Q. Discuss the geological and environmental risks posed by glacial lake outburst floods (GLOFs) in the Himalayan region and suggest mitigation strategies.
- geological instability
- impact on hydropower infrastructure
- transboundary disaster management
- climate change impact
Keywords: slope failure · glacial lake outburst flood · seismic activity · transboundary disaster · hydropower vulnerability