Wiktionary
adv. 1 In a tectonic way or manner. 2 In a fundamental way. 3 (context geology seismology English) Involving tectonic plates.
Usage examples of "tectonically".
One of many independent contractors who had come to seek their fortune on Fluva, Bioprospector Sethwyn was tall, handsome, bold, with a grin that induced uncommon tremors in parts of her that she had long thought tectonically stable.
When they checked closely here in the crater, they found a little movement, well under two meters a day, and they put it down to volcanic activity, or instrument error, or continental drifta rotation that slow wasn't considered possible, since it couldn't be stable, and Epimetheus is pretty damn tectonically active, not to mention having one hell of a lot of plates sliding around, so they called it continental drift and forgot about it.
Once the geologists ventured beyond the shelf to the tectonically unstable areas, the cores did what they were designed to do: register massive deposits that the shifting plates of the heaving planet had thrown up from its very active thermal core.