Davies & Gribbin (1992: 87-8):
The idea that space and time can be distorted by motion was extended to include the influence of gravity, so that the presence of matter in spacetime would also cause distortions, or warpings, of space and time. … And as gravitating objects move about, so the space and time warps that they produce must also change. It is even possible to set up ripples in spacetime, gravitational waves that travel with the speed of light.
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From the perspective of Systemic Functional Linguistic Theory, the General Theory of Relativity models gravity as the relative contraction of space intervals and the relative expansion of time intervals. So as a gravitating body moves about, the contraction of space intervals and expansion of time intervals towards its centre of mass move about with it.
On this basis, gravitational waves are propagations of space interval contractions and time interval expansions through space-time.
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