What are the two major types of seismic waves?

What are the two major types of seismic waves?

There are two broad classes of seismic waves: body waves and surface waves. Body waves travel within the body of Earth. They include P, or primary, waves and S, or secondary, waves.

What are the slowest seismic waves?

The slowest waves, surface waves, arrive last. They travel only along the surface of the Earth. There are two types of surface waves: Love and Rayleigh waves.

What is the time interval between P and S waves?

S waves are indicated by an abrupt change in wave amplitude. In the seismogram below, we see that the S wave arrived at about 34 sec after the P wave arrived. This time difference is called the S-P interval and is the lag time between the P and S wave.

How do you calculate lag time between P and S waves?

By locating the place on the seismogram (Fig. 2) where the P wave begins (in this case at time ‘0’) then locating the time when the S wave arrives (in this case 64 seconds) you can determine the time lag between the arrival of the P wave and the arrival of the S wave (S – P = Lag, 64 – 0 = 64 sec).

Which wave comes first in an earthquake?

P waves

What are the two types of body wave?

Body waves are of two types: Primary waves (also called P-waves, or pressure waves) and Secondary waves (S-waves, or shear waves). P-waves are compression waves. They can propagate in solid or liquid material. S-waves are shear waves.

What is the difference between surface and body waves?

The two main types of waves are body waves and surface waves. Body waves can travel through the earth’s inner layers, but surface waves can only move along the surface of the planet like ripples on water.

Are P and S waves Body waves?

A body wave is a seismic wave that moves through the interior of the earth, as opposed to surface waves that travel near the earth’s surface. P and S waves are body waves.

What heart rhythm has no P wave?

♥P waves can also be absent if the impulse does not travel up into the atria. A Premature Junctional Contraction is an early beat that occurs prior to the next sinus beat. Similar to a PAC EXCEPT P wave is inverted on the PJC!!