Earthquakes Scattered Across Globe
Computer Science
Seismic record that Earthquakes Scattered Across Globe
A seismic station will record ten earthquakes to show how the data fit the travel time graph. The first earthquake occurs about 3000 miles from the seismic station. PS and surface waves leave the hypocenter of the earthquake, and their arrivals are recorded on the seismograms. Only the first earthquake shows the wavefront migration that the arrival of each wave is shown on their respective seismograms. Notice that the farther the earthquake is from the recording station, the farther apart the PS and surface waves are on the seismograms.
The red pea and blue S waves are body waves that travel through the interior of the earth, the P wave is fastest because it is a longitudinal or compressive wave, similar to sound waves that travel in the direction of compression. The S waves are 60% slower because they have a shearing motion perpendicular to the direction of travel. The slower yet, surface waves roll along the surface of the earth in an undulating motion. Although there are no continents shown here, so we can place large earthquakes in a random pattern. We will assert an interior similar to that of the earth. Seismograms reflect the appropriate distances.