Methodological approach to multi-hazard analysis: the case of the Garrotxa region (Catalonia, Spain)

Abstract. Amidst the escalating impacts of climate change and the growing frequency of natural disasters, the urgent need for robust multi-risk assessment and proactive mitigation strategies has become increasingly apparent. The Garrotxa region, characterized by its diverse array of weather-related hazards (such as torrential rains, floods, debris flows, lahars, tornadoes) and geological hazards (including landslides, rockfalls, earthquakes, and volcanic eruptions), presents an example of the challenges faced by communities globally, necessitating a shift towards anticipatory disaster management. Departing from conventional simulation models, we recognize the fundamental role of past experiences in shaping future risk assessments and mitigation strategies. This paper introduces a methodology for the creation of a multi-hazard database tailored to the Garrotxa region, serving as a foundational step towards subsequent multi-risk analysis. By meticulously documenting the region's historical hazards since 1900, our approach aims to equip stakeholders with a nuanced comprehension of multiple natural processes. This comprehensive strategy, which combines modern monitoring techniques with historical context, forms a synergistic approach crucial for effective, long-term disaster risk mitigation. Our work not only sheds light on the unique challenges faced by the Garrotxa region but also provides a scalable model for regions grappling with diverse natural phenomena worldwide. This contribution aims to enhance disaster resilience in regions confronting similar potential multi-hazard scenarios.