From North point to the center of the earthquake (Epicenter) to on the surface world. In the same way to throw a stone into the water and caused ripple on the surface of the water. Surface waves move slower waves in the Middle
From Earthquake Epicenter (Epicenter) to the top surface world. In the same way, throw a stone into the water and the ripples on the surface. Surface waves move more slowly than waves in the medium.
Travel from North Point Center earthquake (Epicenter) to on the floor on the earth's surface. In the same manner as to throw stones into the water and a ripple on the surface of the water. Surface wave moving slower than the wave in the medium.