Seismic surface waves travel along the Earth's surface. They can be classified as a form of mechanical surface waves. They are called surface waves, as they diminish as they get further from the surface. They travel more slowly than seismic body waves (P and S). In large earthquakes, surface waves can have an amplitude of several centimeters.
gnaw meaning, definition, what is gnaw: to bite or chew something repeatedly, usually making a hole in it or gradually destroyingâ¦. Learn more.
Gnawing also helps when they're eating to chew the food, in this way it is an eating technique. When small gnawing herbivores gnaw on things in the household, it usually has a negative effect often making men yell something along the lines of:  Damn it all, Delilah!