Application workspaces

Explore PHYGRAV surrogate applications. Each workspace includes inputs, sample scenarios, and outputs tailored to partners.

Surrogate apps Decision support Ready-to-run

Available apps

Direct access to published surrogate apps.

Operational surrogate delivering fast landslide-tsunami scenarios; tuned for Mayotte.

Precomputed mass-drop simulations over complex topography; supports seismic add-ons.

Surrogates approximate tsunami simulations with generalized Polynomial Chaos Expansions (gPCE) built from a sparse set of high-fidelity runs.

Stochastic inputs (e.g., slide volume, location) are modeled with independent priors; uniform ranges follow maximum-entropy when data are scarce.

draw: Gauss–Patterson / delayed GP abscissas reused via nesting

Hazard quantities ξ are expanded on Legendre polynomial bases: ξ̂(R)=Σ_{|α|≤p} ξα Ψα(R).

Legendre basis ↔ uniform priors order p chosen for convergence

Deterministic coefficients come from sparse-grid quadrature (PSA/Smolyak), limiting full simulations while keeping accuracy.

quadrature weights + nodes curse-of-dimensionality mitigated

Surrogates deliver moments, sensitivities, and rapid scenario sweeps; validation compares gPCE predictions to withheld simulations.

netCDF/maps per app target: ms-level evaluation