What are the components of seismic waves?

Modern seismometers include three (3) elements to determine the simultaneous movement in three (3) directions: up-down, north-south, and east-west. Each direction of movement gives information about the earthquake.

What are the three components of a seismograph?

To overcome this problem, modern seismograph stations have three separate instruments to record horizontal waves – (1) one to record the north-south waves, (2) another to record east-west waves, and (3) a vertical one in which a weight resting on a spring tends to stand still and record vertical ground motions.

What is seismic station?

A seismic station is considered to be a permanent installation of a seismic sensor and possibly a seismic recorder. The main goal is to make a sensor installation which is as insensitive to ambient noise sources (human and environmental) as possible, so that the sensitivity for earthquake generated signals is high.

What does a seismogram measure?

A seismogram is the recording of the ground shaking at the specific location of the instrument. On a seismogram, the HORIZONTAL axis = time (measured in seconds) and the VERTICAL axis= ground displacement (usually measured in millimeters).

How do you read a seismometer?

The seismogram is “read” like a book, from left to right and top to bottom (this is the direction that time increases). As with a book, the right end of any horizontal line “connects” with the left end of the line below it. Each line represents 15 minutes of data; four lines per hour.

What is difference between seismogram and seismograph?

What is the difference between a seismograph and a seismogram quizlet? Seismographs are instruments located at or near the surface of the earth that records seismic waves. A seismogram is a tracing of earthquake motion and is created by a seismograph.

What are the 2 types of seismic waves?

There are several different kinds of seismic waves, and they all move in different ways. 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.

Where are the four stations of the seismograph network?

Stations B, C, D, and the cow are too far from the earthquake to feel the seismic waves though sensitive equipment records their arrival. 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.

How are seismographs used to track an earthquake?

They mark the points on the record at which these waves first arrive at the station. The simplest method of locating an earthquake on a globe is to find the time interval between the P- and S-wave arrivals at several seismograph stations.

How are earthquakes recorded in a seismic network?

Earthquakes are recorded by a seismographic network . Each seismic station in the network measures the movement of the ground at that site. The slip of one block of rock over another in an earthquake releases energy that makes the ground vibrate.

How are seismic waves exaggerated in the seismogram?

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. A cow and a tree in this narrated cartoon for fun and to emphasize that seismic waves traveling away from an earthquake occur everywhere, not just at seismic stations A, B, C, and D.