Because the amplitude of the surface waves diminishes less rapidly with distance than the amplitude of P or S waves, surface waves are often the most important component of ground shaking far from the EARTHQUAKE source, thus can be the most destructive.
For a map of the mountainous area, the elevation has to be 5-100 meters. As the area is a mountain or a hilly upland area, it has a contour interval of 100 meters or more. For a relatively flat area it as to have a C.I of 10 meters or less.
