![]() ![]() This was later called the "Mohorovic discontinuity". Croatian seismologist Andrija Mohorovičić noticed from the travel-time curve of the 1909 earthquake that some seismic waves traveled faster than others, explaining this fact with a discontinuity in which the velocity of the P wave changes abruptly. In other words, when the seismic wave reaches the Mohorovic discontinuity, the travel-time curve bends. Seismic waves travel slowly in the crust, but conversely fast in the mantle. The reason is that the speed at which seismic waves travel differs between the crust and the mantle. ![]() Seismic waves usually travel at a constant speed, but the travel-time curve does not become a straight line, but always bends somewhere. Travel-time curve also shows the relationship that the surface wave arrives first at the point near the epicenter, and conversely the refracted wave arrives first at the point far from the epicenter. For example, by examining the travel-time curve of a teleseism, it can be seen that the earth consists of the crust, mantle, outer core, and inner core. It also provides clues to study the layered structure inside the earth. īy examining the travel-time curve, it is possible to know the seismic wave velocity and the depth of the epicenter and so on. Travel-time curve is drawn when the vertical axis of the graph is the travel time and the horizontal axis is the epicenter distance of each observation point. Take this fun and exciting Ten questions quiz and find out how much you know about the Seismic Waves. Its not hard to find natural disasters in the world today, thats why we have to know what causes it, perhaps stop its possibility. Travel-time curve is a graph showing the relationship between the distance from the epicenter to the observation point and the travel time. The seismic wave is an energy which is the primary cause of earthquakes and other ugly natural disasters. Travel Time (in Seismology) means time for the seismic waves to travel from the focus of an earthquake through the crust to a certain seismograph station. ![]()
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