Gravity describes the deformation of our living space, which is a continuum that can be deformed and can be vibrated. Some vibrations deform temporarily. Others don't. Vibrations that deform the continuum locally add at least temporarily some volume to the continuum. That deformation spreads over the continuum and thus, the deformation quickly fades away. However, the vibration permanently expanded the continuum. Locally a spherical shock front adds a volume to the continuum. If the shock front is triggered by a point-like actuator, then the front integrates into the Green's function of the continuum. This Green's function has a volume. The continuum can be described by a quaternionic function. In the imaginary part of the quaternionic parameter space, the addition of the Green's function increases the difference between the quaternionic function and its parameter space.
In a huge dense and coherent recurrently regenerated swarm of triggers the Green's functions will overlap. The deformation will equal the convolution of the Green's function and the location density distribution that describes the hop landing locations. This deformation is significant and it is persistent. If the swarm moves, then the deformation will accompany the swarm.
Article An Explanation of Gravitation