The seismograph was invented by the Chinese polymath Zhang Heng in 132 AD during the Han dynasty. Zhang's seismoscope was able to detect and indicate the direction of earthquakes from hundreds of miles away.
It's a seismograph.
Geologists use seismographs. They try to see when an earthquake is going to occur.
A seismogram is a record of an earthquake that's obtained from a seismic instrument. It's in the form of a graph.
Why, a seismographer of course! Seriously though... Anyone who studies, or monitors for, earthquakes, volcanoes, & other such phenomena would use one.
The correct spelling (transposed) is seismograph(measures and records seismic activity).
That would be a secondary, or 'S' wave. Moving in a snakelike movement, this wave has to travel a farther distance, so it takes longer to reach the recording equipment.
a siesmic wave is a wave that travels through the earth. there are two MAIN types, P and S waves. a siesmograph shows the type of wave and how far away it is from that point.
A seismometer is an instrument that is anchored to the ground and records the Earth's movements, specifically seismic waves caused by earthquakes and other sources of ground motion.
A seismogram is a record of ground motion produced by seismic waves from an earthquake or another source. It typically shows the amplitude and frequency of the seismic waves over time, helping seismologists analyze and understand the earthquake's characteristics.
jv
invented in 500BC before electricity was invented