|
Pathway 2 (shown
below in blue) begins with an earthquake forecast model, but it
employs the scenario events as sources for a physics-based calculation
of ground motions. The waves from these sources are propagated using
an anelastic wave model (AWM), and they excite ground motions at
a specified location through a site response model (SRM) that accounts
for the near-surface conditions, such as soil rigidity and layering.
The results are vector-valued ground displacements as a function
of time, from which essentially any intensity measure can be computed.
However, in a region like Southern California where the geological
structures are highly three-dimensional, the wavefield calculations
must be done for each scenario earthquake on very dense grids to
get the high frequencies of engineering interest (> 1 Hz), and
the computational demands for these simulations can be enormous.
One of the principal objectives of this proposal is to accelerate
the use of ground-motion modeling in SHA. In particular, we seek
the means to compute and distribute comprehensive catalogs of ground-motion
simulations for use in risk assessment and earthquake-engineering
analysis. Such catalogs are needed, for example, as input to research
done at NSF's earthquake engineering research centers and its Network
for Earthquake Engineering Simulation (NEES).
SCEC/CME Computational
Pathway Diagram:
|
