The seismograph was not discovered, it was invented in 132 CE by Zhang Heng, but most modern seismographs are derived from a design by John Milne, James Alfred Ewing, and Thomas Gray, who worked in the late 19th century.
A seismometer (the term seismograph may be used to describe a seismometer combined with an instrument for recording and displaying the amplitude and frequency of the seismic waves that the seismometer measures). Please see the related link.
The seismometer is the 'odd one out'. The other instruments measure factors to do with weather (wind speed, air pressure & temperature) - the seismometer measures movements in the Earth's crust.
A seismograph is a device that records vibrations and seismic waves caused by earthquakes, while a seismometer is a sensor that detects ground motion. Essentially, a seismometer is a component of a seismograph, which includes additional recording instruments.
A seismometer station is a facility equipped with seismometers, instruments that detect and record ground motion from seismic waves generated by earthquakes or other sources. These stations are strategically located worldwide to monitor and study seismic activity. The data collected from seismometer stations help scientists assess earthquake hazards and understand the Earth's internal structure.
At least three.Please see the related question for an explanation as to why.A minimum of three seismograph or seismometer stations are required to locate the epicentre of an earthquake.
Seismometer was created in 1880.
the recording produced by a seismometer
seismometer
A Geologist uses a seismometer to measure earth tremors and movements, and to help predict a possible earthquake.
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An earthquake is recorded by a measurement called Richer scale and Mercille scale or the Seismometer. A seismometer is an instrument . . . While not sensitive enough to detect it.
The seismometer records the P and S-wave arrival times. P-waves travel faster through the earth than S-waves and so they arrive at the seismometer station before the S-waves and are recorded by the seismometer first. The difference in arrival time between the two types of seismic wave can be used to calculate the distance of the earthquake's epicentre from the seismometer. This can then be plotted on a map, by drawing a circle with a radius equal to the distance to the epicentre around the seismometer station. This is then repeated for the other two seismometer stations and the point where the three circles intersect is the location of the earthquakes epicentre.
A seismometer (the term seismograph may be used to describe a seismometer combined with an instrument for recording and displaying the amplitude and frequency of the seismic waves that the seismometer measures). Please see the related link.
Because they are recorded on a seismometer.
Seismometer
Seismograph
Seismometer