Swiss Alps Face Hidden Tsunami Threat After 1601 Lake Lucerne Disaster
Five centuries ago, a powerful earthquake near Mount Stanserhorn triggered a deadly tsunami on Lake Lucerne. The disaster struck on 18 September 1601, sending waves up to ten metres high crashing into nearby shores. Now, new research has revealed the ongoing risk—and the potential for billions in damage if such an event were to happen again today.
The 1601 quake, estimated at magnitude 5.9, shook Central Switzerland violently. It caused underwater landslides, displacing vast amounts of sediment in the lake. These subaquatic avalanches generated waves that surged onto land, drowning at least ten people and destroying homes. Some historical accounts suggest dozens more may have died from flooding and landslides across the region.
Scientists from the University of Bern and ETH Zurich have since studied the event in detail. Using modern modelling, they found that a similar tsunami today could push hundreds of metres inland along the shores of Nidwalden. The canton's steep terrain and lakebed shape make it especially vulnerable to large waves. In response, authorities have updated the water hazard map for Lake Lucerne to include tsunami risks. Estimates show that a repeat of the 1601 disaster could cause up to nine billion Swiss francs in damage to buildings alone. Local officials in Nidwalden are now reviewing emergency plans to prepare for such a scenario.
The findings highlight a long-overlooked danger in the Swiss Alps. While tsunamis are rare on Lake Lucerne, the 1601 event proves their destructive potential. With updated risk assessments in place, the canton of Nidwalden is working to reduce future harm to lives and infrastructure.
