" The crust [of the earth] is very thin. Estimates of its thickness range from a minimum of about twenty to a maximum of about forty miles. The crust is made of comparatively rigid, crystalline rock, but it is fractured in many places, and does not have great strength. Immediately under the crust is a layer that is thought to be extremely weak, because it is, presumably, too hot to crystallize. Moreover, it is thought that pressure at that depth renders the rock extremely plastic, so that it will yield easily to pressures. The rock at that depth is supposed to have high viscosity; that is, it is fluid but very stiff, as tar may be. It is known that a viscous material will yield easily to a comparatively slight pressure exerted over a long period of time, even though it may act as a solid when subjected to a sudden pressure, such as an earthquake wave. If a gentle push is exerted horizontally on the earth's crust, to shove it in a given direction, and if the push is maintained steadily for a long time, it is highly probable that the crust willl be displaced over this plastic and viscous lower layer. The crust, in this case, will move as a single unit, the whole crust at the same time. This idea has nothing whatever to do with the much discussed theory of drifting continents, according to which the continents drifted separately, in different directions.
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Let us visualize briefly the consequences of a displacement of the whole crustal shell of the earth. First, there will be the changes in latitude. Places on the earth's surface will change their distances from the equator. Some will be shifted nearer the equator, and others farther away. Points on opposite sides of the earth will move in opposite directions. For example, if New York should be moved 2,000 miles south, the Indian Ocean, diametrically opposite, would have to be shifted 2,000 miles north. [...] Naturally, climatic changes will be more or less proportionate to changes in latitude, and, because areas on opposite sides of the globe will be moving in opposite directions, some areas will be getting colder while others get hotter; some will be undergoing radical changes of climate, some mild changes of climate, and some no changes at all.
Along with the climatic changes, there will be many other consequences of a displacement of the crust. Because of the slight flattening of the earth, there will be stretching and compressional effects to crack and fold the crust, possibly contributing to the formation of mountain ranges. there will be changes in sea level, and many other consequences. "

― , Earth's Shifting Crust: A Key To Some Basic Problems Of Earth Science