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🌍 '''Seismic risk''' refers to the potential for financial loss arising from earthquake activity, and it represents one of the most consequential [[Definition:Catastrophe risk | catastrophe risk]] exposures in the insurance and [[Definition:Reinsurance | reinsurance]] industry. Unlike perils such as windstorm or flood that occur with relatively high frequency in affected regions, seismic events combine low probability with extraordinarily high severity, creating the potential for losses that can exceed the capacity of individual [[Definition:Insurance carrier | insurers]] and even strain the broader market. Major earthquake-prone regions — including Japan, the west coast of the United States, Turkey, New Zealand, Chile, and parts of China and Southeast Asia — generate substantial [[Definition:Premium | premium]] volumes and pose significant [[Definition:Accumulation risk | accumulation risk]] challenges for insurers and reinsurers operating in those markets.

📊 Insurers and reinsurers assess seismic risk through [[Definition:Catastrophe model | catastrophe models]] developed by specialist firms such as [[Definition:Moody's RMS | Moody's RMS]], [[Definition:Verisk | Verisk]], and [[Definition:CoreLogic | CoreLogic]], which simulate thousands of potential earthquake scenarios against detailed exposure data to estimate probable losses at various return periods. These models incorporate seismological science — fault line mapping, historical event catalogs, ground motion attenuation, and soil amplification effects — together with engineering vulnerability functions that predict structural damage across different building types and construction standards. [[Definition:Underwriting | Underwriters]] use model outputs to set pricing, manage [[Definition:Aggregate exposure | aggregate exposures]], and structure [[Definition:Reinsurance program | reinsurance programs]], while [[Definition:Capital management | capital managers]] rely on metrics such as the [[Definition:Probable maximum loss (PML) | probable maximum loss]] and the [[Definition:Occurrence exceedance probability (OEP) | occurrence exceedance probability]] curve to calibrate how much capital to hold against earthquake scenarios.

🏗️ The financial significance of seismic risk has been underscored by landmark events that reshaped insurance markets: the 1994 Northridge earthquake transformed residential earthquake insurance in California and led to the creation of the [[Definition:California Earthquake Authority (CEA) | California Earthquake Authority]]; the 2011 Tōhoku earthquake and tsunami in Japan produced one of the costliest insured losses in history; and the 2010–2011 Canterbury earthquake sequence in New Zealand triggered fundamental changes in that country's [[Definition:Natural disaster insurance scheme | natural disaster insurance scheme]] and reinsurance purchasing strategy. Because earthquake risk produces tail losses that can dwarf annual premium income, it is a major driver of demand for [[Definition:Catastrophe bond | catastrophe bonds]], [[Definition:Industry loss warranty (ILW) | industry loss warranties]], and other [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] that transfer peak exposures to the capital markets. Regulatory frameworks across jurisdictions impose specific [[Definition:Solvency | solvency]] requirements for natural catastrophe exposures, reinforcing the need for robust seismic risk management within every insurer's enterprise risk framework.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe risk]]
* [[Definition:Catastrophe model]]
* [[Definition:Probable maximum loss (PML)]]
* [[Definition:Catastrophe bond]]
* [[Definition:Accumulation risk]]
* [[Definition:Natural catastrophe]]
{{Div col end}}

Definition:Seismic risk - Revision history

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