Nepal's 'land tsunami' baffles experts

Nepal is grappling with the aftermath of a catastrophic 'land tsunami,' a massive flow of mud and debris that surged nearly 170 kilometers through the Bhote Koshi valley. The disaster has flattened villages and claimed hundreds of lives, leaving experts puzzled about its origins and the sheer force of the phenomenon.

International aid organizations and countries are mobilizing financial aid, emergency supplies, and other assistance to help Nepal cope with the devastating flash floods. The event has also sparked global concern, particularly for the hundreds of tourists and foreign nationals reported to be in Nepal who remain unaccounted for.

“

We believe rock and ice collapses occurred in Nepal, blocking the Lhende River and causing the chain flood event.

Initial theories suggested an earthquake might have triggered landslides that dammed a river, leading to a catastrophic overflow. However, the U.S. Geological Survey (USGS) later indicated that seismic data suggested the energy release originated from a glacial collapse and subsequent mudflow, rather than a typical earthquake.

“

The situation essentially defeated every flood warning system in the world. When the mudflow started to appear, it was too late to act.

Experts from the International Centre for Integrated Mountain Development (ICIMOD) believe rock and ice collapses blocked the Lhende River, initiating a chain reaction of flooding. The absence of prior rainfall has further complicated the situation, rendering existing flood warning systems ineffective. Hydrologists described the fast-moving mud and water as a deadly 'liquid concrete,' leaving little chance for escape.

Concerns are growing about the link between such events and climate change. Researchers note that warming trends in the Himalayas are increasing the likelihood of heatwaves, glacier retreat, and permafrost thaw, which can trigger landslides and glacial lake outburst floods. Long-term solutions may involve installing real-time river level monitoring systems to provide timely warnings to residents.

“

We know what the climate change trends are in the Himalayas. There is a high confidence that more heatwaves, glacier retreats, and permafrost degradation will occur, and these things can trigger landslides and glacial outburst floods.