What is a 'fragility curve' in the context of probabilistic seismic risk assessment, and what does it represent?

In the context of probabilistic seismic risk assessment, a 'fragility curve' is a graphical representation that shows the probability of a structure or component reaching or exceeding a specific damage state for a given level of ground motion intensity. It is a key component in quantifying seismic risk. A fragility curve plots ground motion intensity (e.g., peak ground acceleration, spectral acceleration) on the x-axis and the probability o....