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a seismologist
The seismologist is studying earthquake prediction and disaster prevention.
an earthquake
There was a big earthquake yesterday.
earthquake
Yesterday, a big earthquake occurred.
(obsolete) an earthquake
seismograph
Seismologists use seismographs to accurately measure the magnitude of earthquakes.
seismology
He is an expert in seismology.
a large earthquake; typically has a magnitude 7 or greater
A large earthquake occurred yesterday, throwing the entire town into chaos.
Kyūjitai form of 地震学: seismology
use, usage
The use of this machine is simple.
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