Building Trust Is Key In Warnings On Melting Glaciers, Pg13

Key Highlights:

• A recent disaster in Nepal and Tibet, similar to the 2021 Chamoli disaster, originated from a rock-ice avalanche that transformed into a devastating debris flow.
• Initial reports incorrectly suggested an earthquake or a Glacial Lake Outburst Flood (GLOF), but the event was a rock-ice avalanche hitting the valley floor.
• Globally, 15 million people face GLOF danger, with over 9 million in High Mountain Asia and nearly 3 million in India.
• A significant number of casualties in both the Nepal/Tibet and Chamoli disasters were workers in hydropower infrastructure located in the path of these flows.
• The article highlights the challenge of predicting rock-ice avalanches compared to GLOFs, as there are no large lakes to monitor.

Detailed Insights:

• The disaster in Nepal and Tibet, referred to as the Rasuwa disaster, was not a GLOF but a rock-ice avalanche, making it harder to plan for.
• Rock-ice avalanches can originate from hundreds of thousands of steep, rapidly deglaciating slopes with thawing permafrost in the Himalaya.
• While current warning systems can alert those further downstream, they are insufficient for immediate impact zones due to challenges in detection and communication.
• A denser seismic station network is proposed as a potential solution to detect landslide-generated earthquakes and flood events.
• Implementing such a network requires significant cross-border cooperation across the Himalaya and substantial financial investment.
• Building trust within communities regarding warnings and ensuring they know how to respond is crucial for saving lives, though not necessarily the affected areas.

Key Concepts Involved:

• Glacial Lake Outburst Flood (GLOF): A sudden release of a significant volume of water from a glacial lake, often caused by the failure of a natural dam.
• Rock-ice Avalanche: A rapid flow of rock and ice fragments down a slope, often triggered by thawing permafrost or seismic activity.
• Permafrost: Ground (soil, rock, or sediment) that remains frozen for two or more consecutive years, common in high-altitude and polar regions.
• Seismic Station Network: A system of interconnected sensors designed to detect and record ground motion caused by earthquakes or other seismic events.