How long does an earthquake P-wave take to travel the first 6500 kilometers after the earthquake occurs?

Seismology is the scientific study of earthquakes. The p-wave, or primary wave, is the fastest seismic wave and is measured with a seismograph to create a seismogram. The seismograph uses needles to record the waves on paper.

To find out the travel time of a p-wave or an s-wave, use the Earthquake Travel Time chart. When you find 6,500 km on the x-axis, you follow see that the p-wave line intersects at about 10 seconds. A related scientific field is called paleoseismology, which uses geology to study past earthquakes.