An example, important to the San Andreas fault in south-central California, is the origin of the normal stress acting on this fault. By simple force balance, a force is acting on the Sierra Nevada-Great Valley block that is directed WSW, normal to the San Andreas. We currently are developing a capability to model western U.S. dynamics quantitatively, so as to estimate stresses and strengths everywhere. A highly structured approach is required to manage these kinds of problems. Coordination among these elements is crucial.
All output is considered potential input to other routines.
In this example, density structure is itself the output of a filter for which data like topography, gravity and seismic structure are inputs. J. R. astr.