Yield acceleration
0.127g
Shaking needed to start sliding
Catastrophe risk · earthquake
How far will the slope move, and does that matter?
Newmark sliding-block displacement fragility for tailings dams and pit slopes: a defensible screening-level vulnerability function for the case where no published fragility curve exists for your asset.
Move a slider to run the model.
ky / PGA
0.28
Below 1, so the block moves
Displacement Dn
17.6cm
Median, permanent
Expected damage
24.3%
Mean damage ratio for the PML
Loss of containment
3.1%
Chance of complete damage
Slope section
The wedge above the slip surface is the sliding block. It holds while shaking stays under ky, and ratchets downslope every time shaking passes it.
Vulnerability function
Mean damage ratio against shaking. This is the single curve a PML calculation consumes.
Fragility functions
Chance of reaching or passing each damage state, one curve per state.
Damage state at this PGA
Five mutually exclusive outcomes for the current inputs, summing to 100%.
Damage across the hazard space
Mean damage ratio for every PGA and magnitude pair, holding the slope fixed. The ring marks your inputs.
Tabulated curve
The same numbers, ready to paste into a loss model. The highlighted row is your current PGA.
JSON export carries the full scenario: inputs, coefficients, thresholds, both curves and the current results, so a reviewer can reproduce the numbers without opening the tool.