A seismologist is an expert in the science of earthquakes.
Seismologists study earthquakes. Charles Francis Richter was probably the most famous seismologist
The word seismologist is a noun. A seismologist is someone who practices seismology.
they use seismographs to measure seismic waves
Inge Lahmann was a seismologist
Seismologist use a seismometer or seismograph to record the P and S-wave arrival times.Please see the related question for detail on how this is used to locate an earthquake epicenter.Geologists use seismic waves to locate an earthquake's epicenter.
mercalli scale
A Seismologist does their job by recording and finding out about earthquakes
The seismologist warned us this would happen weeks ago.The results are being studied by the seismologist.
A seismologist. Names, I'm not so good at.
Multiple seismographs
Multiple seismographs