S waves cannot pass through the liquid outer core, but P waves can. The waves are refracted as they travel through the Earth due to a change in density of the medium. When the waves cross the boundary between two different layers, there is a sudden change in direction due to refraction. …

Seismic Shadow Zones: S wave shadow zone All are shear waves that travel in all directions away from the epicenter of an earthquake. The different phases show how the initial S wave is stopped, or changes when encountering boundaries in the Earth.

The bending of seismic waves is called refraction. Figure 19.2b: S-waves do not travel through the outer core, creating an even bigger shadow zone for S-waves. The fact that S-waves do not travel through the outer core suggests that the latter is liquid.

The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.

A seismic shadow zone is an area away from the epicenter where seismic activity is minimized or not present. A seismic shadow zone is not in a constant place; each earthquake epicenter has a different shadow zone.

P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation. In rock, S waves generally travel about 60% the speed of P waves, and the S wave always arrives after the P wave.

P-wave shadow zones are formed due to refraction, which causes the waves to deviate away. But S-wave shadow zones are created because these waves are completely blocked. Thus the S-wave shadow zones are much larger.

The S wave shadow zone is the area of the Earth’s surface where S waves are not detected following an earthquake. This shadow zone has led geologists to a model of the Earth with a solid mantle and a liquid core. From the diagram, we can see the region where S waves are not detected.

The Philippines lies along the Pacific Ring of Fire, which causes the country to have frequent seismic and volcanic activity. Many earthquakes of smaller magnitude occur very regularly due to the meeting of major tectonic plates in the region. The largest was the 1918 Celebes Sea earthquake with Mw8.3.

Their paths are usually curved – this is due to the fact that the waves are refracted as they meet the gradually changing density of the layers within the Earth. S waves are not detected on the opposite side of the Earth – this suggests that the mantle has solid properties, but the outer core must be liquid.

S waves cannot pass through the liquid outer core, but P waves can. The waves are refracted as they travel through the Earth due to a change in density of the medium. This causes the waves to travel in curved paths.

S-waves cannot travel through liquids. When they reach the surface they cause horizontal shaking. Liquids don’t have any shear strength and so a shear wave cannot propagate through a liquid. Think of a solid material, like a rock.

The s-wave shadow zones are caused by the core, because the core is assumed to be liquid, and the s-waves can not go through liquids. The p-wave shadow zones are ALSO caused by the core, because the core is round, so the p-waves have to go along the perimeter, not go straight through.

S shadow zones are caused by the fact that S waves stop at the core and the sides of the crust. When they touch the core or the crust between the 0-150 degree angle there are no more waves to travel through the interior.

The S wave shadow zone is the area of the Earth’s surface where S waves are not detected following an earthquake. This shadow zone has led geologists to a model of the Earth with a solid mantle and a liquid core.

The shadow zone is an area of almost stagnant water sitting between the rising currents caused by the rough topography and geothermal heat sources below 2.5km and the shallower wind driven currents closer to the surface.