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🏗️ '''Vulnerability module''' is one of the core analytical components within a [[Definition:Catastrophe model|catastrophe model]], responsible for translating the physical characteristics of a hazard event — such as wind speed, ground shaking intensity, or flood depth — into an estimate of the damage sustained by exposed properties and assets. In insurance, catastrophe models are the primary tools that [[Definition:Underwriter|underwriters]], [[Definition:Actuary|actuaries]], and [[Definition:Risk manager|risk managers]] use to quantify potential [[Definition:Loss|losses]] from natural and man-made perils, and the vulnerability module sits at the heart of this process, bridging the gap between the hazard itself and the financial consequences that flow from it.

⚙️ The module operates by applying damage functions — also called vulnerability curves or fragility functions — that relate a given intensity of hazard to a mean damage ratio (the proportion of an asset's value that is destroyed or impaired). These functions are calibrated to specific combinations of construction type, building height, occupancy class, age, and other structural characteristics. For example, a reinforced-concrete commercial building will sustain far less damage at a given wind speed than a wood-frame residential structure, and the vulnerability module captures this difference through distinct curves for each building type. Leading commercial catastrophe model vendors — including [[Definition:Verisk|Verisk]] (formerly AIR Worldwide), [[Definition:Moody's RMS|Moody's RMS]], and [[Definition:CoreLogic|CoreLogic]] — invest heavily in engineering research, post-event claims data, and laboratory testing to refine these functions. Regulators in several markets require or encourage the use of catastrophe models that include robust vulnerability modules: the [[Definition:Florida Commission on Hurricane Loss Projection Methodology|Florida Commission on Hurricane Loss Projection Methodology]], for instance, certifies models partly based on the quality of their vulnerability components, while [[Definition:Solvency II|Solvency II]] [[Definition:Internal model|internal models]] in Europe must demonstrate that vulnerability assumptions are well-founded and regularly validated.

📊 The accuracy of the vulnerability module has outsized influence on the reliability of modeled [[Definition:Loss|loss]] estimates, and by extension on [[Definition:Reinsurance|reinsurance]] pricing, [[Definition:Insurance-linked securities (ILS)|ILS]] structuring, and [[Definition:Capital|capital]] adequacy determinations. If the module overestimates damage, insurers will over-reserve and overprice their products, losing competitiveness; if it underestimates, they face the risk of [[Definition:Insolvency|insolvency]] after a major event. This sensitivity is why model users — including [[Definition:Reinsurer|reinsurers]], [[Definition:Rating agency|rating agencies]], and regulators — pay close attention to model version changes that modify vulnerability assumptions, and why insurers with proprietary data often develop supplemental or adjusted vulnerability curves to better reflect their own portfolio's characteristics. For [[Definition:Insurtech|insurtech]] firms leveraging satellite imagery, IoT sensor data, and [[Definition:Machine learning|machine learning]], improving vulnerability estimation at the individual-property level represents one of the most impactful frontiers in [[Definition:Risk assessment|risk assessment]].

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe model]]
* [[Definition:Exposure module]]
* [[Definition:Hazard module]]
* [[Definition:Financial module]]
* [[Definition:Damage ratio]]
* [[Definition:Probable maximum loss (PML)]]
{{Div col end}}

Definition:Vulnerability module - Revision history

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