Critical infrastructures and other technological systems such as transportation systems, telecommunication networks, power lines, pipelines, and reservoirs are at risk of natural hazards (e.g. earthquakes, floods, landslides, wildfires) in many urban and rural areas worldwide. A key to safe and affordable operations of these types of infrastructures is in-depth knowledge of their exposure and vulnerability to natural hazards and the impact of damage experienced either locally or across the network. Fundamental understanding of hazard and risk involves (a) systematic identification, monitoring, and mapping of potential infrastructure exposure; (b) integrated assessment of impact as a result of damage, repair, and/or mitigation; (c) indirect losses from infrastructure disruption and synergistic effects; and (d) consideration of interactions between hazards and/or cascades of hazards. This SI welcomes contributions with a focus on natural hazards risk assessment for critical infrastructures and technological systems, as well as compilation of databases to record impact and elements at risk. We also encourage abstracts addressing the development and application of tools for cost modelling. The SI is dedicated to contributions with national, regional, and local perspectives and intends to bring together experts from science and practice as well as young scientists.