Seismologists
To calculate an earthquake's starting time, seismologists compare seismograms and note the differences in arrival times of P and S waves.
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Seismologists use seismograms to calculate when an earthquake started. AND EARTHQUAKES START WHEN ROCK SLIPS SUDDENLY ENOUGH ALONG A FAULT TO CREATE SEISMIC WAVES!
The Richter scale.
seismologists
Seismologists or geologists, respectively.
seismologists
Seismologists are people who study earthquakes and the propagation of earthquake waves (more correctly termed seismic waves) through the Earth.
They are called seismologists.
nothing.
Seismologists.
Universities and the USGS.
Seismologists
Seismologists
Seismologists.
They practice the profession of seismology.