What is P and S wave?
P-waves are compression waves that apply a force in the direction of propagation. On the other hand, S-waves are shear waves, which means that the motion of the medium is perpendicular to the direction of propagation of the wave. The energy is thus less easily transmitted through the medium, and S-waves are slower.
What do P waves and S waves show?
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.
What is the difference between S & P waves?
P waves are recorded earlier than S waves, because they travel at a higher velocity. P waves can travel through liquid and solids and gases, while S waves only travel through solids. Scientists use this information to help them determine the structure of Earth.
What are PSL and R waves?
2. Seismic Waves: The main seismic wave types are Compressional (P), Shear (S), Rayleigh (R) and Love (L) waves. P and S waves are often called body waves because they propagate outward in all directions from a source (such as an earthquake) and travel through the interior of the Earth.
How do you find the P wave and S wave?
Finding the Distance to the Epicenter (From Bolt, 1978.) 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 of simplified S and P travel time curves and mark that point.
What are 3 differences between P waves and S waves?
The major differences between P waves and S waves include wave speeds, wave types, travel capabilities, and wave sizes. Secondary waves travel slower, move in an up-and-down pattern, travel only through solids, and cause more damage due to their greater size.
What is the time difference between the 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.
What is the motion of S waves?
S waves produce vertical and horizontal motion in the ground surface. Particle motion consists of alternating transverse motion. Particle motion is perpendicular to the direction of propagation (transverse).
What do P and S-waves tell us about the internal structure of the earth?
Seismic waves tell us that the Earth’s interior consists of a series of concentric shells, with a thin outer crust, a mantle, a liquid outer core, and a solid inner core. P waves, meaning primary waves, travel fastest and thus arrive first at seismic stations. The S, or secondary, waves arrive after the P waves.
Where do the P and S waves come from?
This companion to the animation “Four-Station Seismograph network” shows the arrival of seismic waves through select wave paths through the Earth (P and S waves) and over the surface of the Earth. The movement at distant stations occurs at a microscopic scale.
What kind of wave is propogation and particle motion?
The animations below illustrate both the propogation of the wave as well as the motion of particles as the wave passes. Wave propogation and particle motion for… P-wave:the primary body wave; the first seismic wave detected by seismographs; able to move through both liquid and solid rock.
How are Love waves different from surface waves?
Love Waves—surface waves that move parallel to the Earth’s surface and perpendicular to the direction of wave propagation.. Seismic waves travel through the earth to a single seismic station. Scale and movement of the seismic station are greatly exaggerated to depict the relative motion recorded by the seismogram as P, S, and surface waves arrive.
Which is slower S wave or S wave?
The S wave is slower at 4 km/sec and propagates with particle motions that are perpendicular to the direction of propagation.