Primary waves (P waves) arrive at a seismograph first. Then, Secondary waves arrive. Lastly, Surface waves occur and cause the most damage.
A seismometer detects primary waves (P-waves) first. These are the fastest seismic waves and are the first to arrive at a seismometer after an earthquake.
A seismogram is a recording of ground motion at a particular ground location, as collected by a seismometer. Multiple seismograms, taken from different locations, can be analyzed to determine the magnitude, depth and location of an earthquake.Seismograms used to be recorded on paper by seismograph machines, but virtually all seismograms are recorded digitally, today, since computers are essential to accurately process the simultaneous readings from hundreds of seismometers.
A seismometer (or the older device called a seismograph) records the seismic waves from earth tremors.+++There is a difference there: a seismometer would simply register instant vibration; a seismograph records the vibrations with time so shows the whole picture.
A seismogram is a graphical representation of the ground motion recorded by a seismometer during an earthquake. It shows the amplitude and frequency of seismic waves as they travel through the Earth. Seismologists use seismograms to analyze earthquake characteristics such as magnitude, depth, and location.
During an earthquake, seismic waves are released. These waves travel through the Earth and can be detected by seismographs. The main types of seismic waves are P-waves (primary waves), S-waves (secondary waves), and surface waves.
P-waves which are a compression or pressure wave are the fastest seismic waves. As they are the fastest they will reach the seismic station before any of the other seismic waves and be recorded first. Seismologists can use the difference between the arrival times of different seismic waves to calculate the distance and ultimately the location of the earthquakes epicentre. For information on this, please see the related question.
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P waves
The instrument that detects seismic waves is called a seismometer or seismograph. It measures the vibrations caused by seismic waves in the Earth's crust and can help to monitor and study earthquakes.
Earthquake waves (seismic waves) are measured using a seismograph or seismometer.
The energy released by an earthquake is measured using a seismometer. The amplitude of the seismic waves recorded by a seismometer are in-turn plugged into an equation that gives a value on the magnitude scale.
The Richter scale assigns a magnitude number to an earthquake based on the maximum amplitude of the seismic waves as recorded on a seismometer and the distance of the seismometer station from the epicentre of the earthquake.
A seismometer detects primary waves (P-waves) first. These are the fastest seismic waves and are the first to arrive at a seismometer after an earthquake.
The Richter scale assigns a magnitude number to an earthquake based on the maximum amplitude of the seismic waves as recorded on a seismometer and the distance of the seismometer station from the epicentre of the earthquake.
Seismometer / seismograph
Earthquakes are measured by a seismometer, also known as a seismograph.
Seismometer (or seismograph) and it measure seismic waves