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## What type of seismic wave vibrates from side to side and up and down?

S waves- vibrate from side to side as well as up and down. They shake the ground back and forth and when they reach the surface they shake structures violently. Only move through solids.

S-waves

## What are P and S waves in earthquakes?

In P or compressional waves, the vibration of the rock is in the direction of propagation. 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.

S waves

## Do P waves travel from side to side?

Body waves travel within the body of Earth. They include P, or primary, waves and S, or secondary, waves. P waves cause the ground to compress and expand, that is, to move back and forth, in the direction of travel. These are the shake waves that move the ground up and down or from side to side.

## What is the classification of body waves?

Body waves are of two types: compressional or primary (P) waves and shear or secondary (S) waves. P- and S- waves are called “body waves” because they can travel through the interior of a body such as the Earth’s inner layers, from the focus of an earthquake to distant points on the surface.

mantle

## How do you find P-waves and S waves?

Measure the distance between the first P wave and the first S wave. In this case, the first P and S waves are 24 seconds apart. Find the point for 24 seconds on the left side of the chart below and mark that point. According to the chart, this earthquake’s epicenter was 215 kilometers away.

## What is the characteristics of S waves?

S-waves are shear waves (though that is not what the S stands for). They move by material flexing or deforming sideways (shearing) from the direction of wave travel, and then returning to the original shape once the wave passes.

## Why do P and S waves curve?

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. When the waves cross the boundary between two different layers, there is a sudden change in direction due to refraction.

## Why do P-waves show up before S waves?

P-waves travel 60% faster than S-waves on average because the interior of the Earth does not react the same way to both of them. As the interior of the Earth is almost incompressible, P-waves transmit their energy quite easily through the medium and thus travel quickly.

## What is the speed of S and P-waves in the outer core?

Typical values for P wave velocity in earthquakes are in the range 5 to 8 km/s. The precise speed varies according to the region of the Earth’s interior, from less than 6 km/s in the Earth’s crust to 13.5 km/s in the lower mantle, and 11 km/s through the inner core.

Inge Lehmann

## What happens to P-waves and S-waves at a depth of 2 500 km?

Table 1 Properties of P-waves and S-waves P-waves pass through both mantle and core, but are slowed and refracted at the mantle / core boundary at a depth of 2900 km. S-waves passing from the mantle to the core are absorbed because shear waves cannot be transmitted through liquids. The core has a radius of 3470 km.

## What are R and L waves?

Seismic Waves: The main seismic wave types are Compressional (P), Shear (S), Rayleigh (R) and Love (L) waves. Although surface wave motion penetrates to significant depth in the Earth, these types of waves do not propagate directly through the Earth’s interior

2021-05-15