  Orbital resonances are believed to be responsible for the delivery of main
belt asteroids to the inner Solar System. Several possibilities have been
suggested to transport asteroids and their fragments into mean motion and
secular resonances including non-gravitational forces and gravitational
scattering. We investigate future resonance crossings of known asteroids that
occur in the main belt over the next century. Our goal is to identify
potentially observable injections of asteroids into source regions for Near
Earth Objects (NEOs) as well as to determine the role of close encounters among
main belt asteroids in this process.
