0 a piece of equipment that measures and records the strength of an earthquake --
1 a piece of equipment which measures and records the strength of an earthquake (= sudden movement of the earth's surface) --
The museum was renovated in 199, the seismograph building in 1995.
He also devised an improved seismograph and created the field of geological prospecting using small, artificially-created earthquakes.
To get a location, someone will have to leave the force field and set up a second seismograph.
They are generally too small to be felt by people, but the existing network of seismographs has been established to monitor tectonic earthquakes.
However, the seismograph network is too far away to provide a good indication of what is happening under the mountain.
It ranks as the sixth largest earthquake ever to be recorded by a seismograph.
Survey pegs, magnetometers and seismograph equipment for early earthquake warnings via radio have also been installed on the crater walls.
The air burst's blast wave, when it hit the ground, produced a seismic wave which registered on seismographs at magnitude 2.7.
