Andrija Mohorovicic Andrija Mohorovicic, born in 1857, was a scientist from Croatia who worked in the fields of meteorology and seismology. In his early years, Mohorovicic became head of the meteorological Observatory in Zagreb and established a number of stations to study thunderstorms, tornadoes and other weather phenomena. In his later years, Mohorovicic turned his thoughts and ideas to the effects of earthquakes, and showed how the seismic waves of earthquakes spread through the Earth. Much of our knowledge of how earthquakes occur, the location of the epicenter and the current models of the Earth's structure can be traced to the work of Andrija Mohorovicic.