AThere are a number of different types of seismometers and they all work in slightly differing ways but generally are based around the same principle.
That principle is inertia. Inertia basically means that stationary masses will remain stationary until a force is applied to them. Conceptually a seismometer can be thought of as a weight or mass, suspended by springs in a frame which is bolted to the floor.
When an earthquake occurs the frame which is attached directly to the floor is caused to move by the seismic waves, however the mass / weight on the spring does not as the seismic waves do not directly affect it (their effect is dampened by the inertia of the mass and the springs). If you were to attach a pencil or pen to the weight and a piece of graph paper to the frame so that they were touching the movement of the frame relative to the stationary mass would be recorded.
Modern seismometers are much more complex than this but in essence rely on this principle.
A seismogram is what measures the size of a woman's breasts. This is usually used before a mammogram.
This is the most ridiculous answer that i have ever heard. It is similar to a seismograph and its main function is to measure seismic waves, so scientists can determine the magnitude of an earthquake.
There are a number of different types of seismometers and they all work in slightly differing ways but generally are based around the same principle.
That principle is inertia. Inertia basically means that stationary masses will remain stationary until a force is applied to them. Conceptually a seismometer can be thought of as a weight or mass, suspended by springs in a frame which is bolted to the floor.
When an earthquake occurs the frame which is attached directly to the floor is caused to move by the seismic waves, however the mass / weight on the spring does not as the seismic waves do not directly affect it (their effect is dampened by the inertia of the mass and the springs). If you were to attach a pencil or pen to the weight and a piece of graph paper to the frame so that they were touching the movement of the frame relative to the stationary mass would be recorded.
Modern seismometers are much more complex than this but in essence rely on this principle.
A seismometer works by sticking a long pipe into the ground. The pipe has motion detectors attached to it, so when there is an earthquake its severity is decided based on how much the pipe moves.
A seismoscope indicates the time at which an earthquake occurred. This is different from a seismograph, which constantly measures the motion the earthquake causes.
A motor slowly pulls paper across the table which makes the pen move that makes the pen draw on the paper.
You need a seismometer for each axis of motion. As such it takes three seismometers.
It's called Seismometers
There are a number of different types of seismometers and they all work in slightly differing ways but generally are based around the same principle. That principle is inertia. Inertia basically means that stationary masses will remain stationary until a force is applied to them. Conceptually a seismometer can be thought of as a weight or mass, suspended by springs in a frame which is bolted to the floor. When an earthquake occurs the frame which is attached directly to the floor is caused to move by the seismic waves, however the mass / weight on the spring does not as the seismic waves do not directly affect it (their effect is dampened by the inertia of the mass and the springs). If you were to attach a pencil or pen to the weight and a piece of graph paper to the frame so that they were touching the movement of the frame relative to the stationary mass would be recorded. Modern seismometers are much more complex than this but in essence rely on this principle. As such seismometers measure the frequency and amplitude of the movements of ground surface as caused by seismic waves.
Most of vibrations can be detected and recorded by sensitive instruments called seismograph, or seismometers. The record produced by a seismometer is called a seismogram.
almost none... ever. no predictions can be made from a single recording because earthquakes are too random
You can think of this in the same way that satellites work to find your location for the GPS in your car. An earthquake happens and it is picked up on 3+ seismometers. These seismometers measure the waves that the earthquake produced and the velocity at which they are traveling and you look at where all the seismometer calculations run together. You have the epicenter of your earthquake.
A seismograph is one such instrument...there might be others.
Samuel D Stearns has written: 'Applications of the coherence function in comparing seismometers' -- subject(s): Seismometers
Seismometers. For information on how seismometers are used, please see the related question.
Because they are detected by seismometers.
3
seismometers
You need a seismometer for each axis of motion. As such it takes three seismometers.
Seismometers work pretty well for measuring them. But there is no true way to predict an earthquake. All methods have not been proven successful
seismometers and seismographs
The trace produced by a seismograph is called a seismogram.
Seismometers are interested in the vibrations of the Earth, for different reasons. Some may be interested in the geological process. Some in the response of buildings and other structures. Seismometers can respond to very low frequencies, down towards 1 milli-Hertz. And up to a few hundred Hertz. These machines do not 'use' frequencies, they merely record what is naturally happening.