Seismicity of The Earth: The largest seismic movements are associated with tectonic shifts of continental plates that make up the Earth's crust. They are clearly shown in this ultimate physical map of seismic activity as first best measured over two decades from 1960 through 1980. The text on this vintage map is as originally set and may appear less sharp than modern digitally made maps. It represents a time period of great breakthrough the accuracy and distribution of seismology instruments, measuring earthquakes worldwide. For those who love seeing below the surface of this living planet, this "Seismicity of The Earth" map will stir their world.