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.
Definition : The Gross National Income (GNI) comprises the total value of currently produced final goods and services produced by the domestic economy of a country, measured within a given period of time, usually a year.