Understanding Natural Risk Assessment and Mitigation Strategies

1. Concept of Natural Risk

Natural risk is defined as the probability that a population in a specific area will suffer damage or catastrophe due to a natural phenomenon. According to UNESCO, this represents the probability of losing human lives, property, or productive capacity due to natural or human-induced events.

Natural Hazards

Natural hazards are physical phenomena—geological, hydrological, or atmospheric—that affect areas at national, regional, or global levels. They are defined by the presence of endogenous or exogenous processes that can result in a catastrophe.

Risk Assessment and Classification

Risk assessment must consider the features of the natural process and the impact on the population. Risk levels are categorized as follows:

• Risk-free zone
• Very low risk
• Low manageable risk
• Medium risk
• High risk
• Very high risk

Risk classification is derived from:

• Internal dynamics: Seismic, volcanic, and deformation processes.
• External dynamics: Erosion, gravitational processes, subsurface geological features, snowy/periglacial/glacial processes, fluvial dynamics, coastal processes, and atmospheric dynamics.

2. The Rule of 3 P: Prediction, Forecasting, and Prevention

Risk factors and constraints may facilitate the occurrence of a catastrophic event. Managing these requires identifying processes that pose a danger to the population.

• Prediction: Aims to identify and announce a phenomenon before it occurs, specifying the location, timing, intensity, and expected behavior.
• Forecasting: Deepens the study of the phenomenon to define risk as the statistical probability of occurrence, including levels of intensity and frequency.
• Prevention: Involves measures and activities implemented to avoid the impact of dangerous phenomena.
• Mitigation: Involves setting a series of decisions and protective measures to reduce the impact of a phenomenon. This includes the construction of resistant buildings and the implementation of technical risk evaluation.