31.   The Japanese equipment records and locates earth tremors caused by volcanic activity.

n. + tremor >>共 22
earth 34.07%
hand 16.48%
year 12.09%
muscle 7.69%
earthquake 5.49%
ground 3.30%
leg 3.30%
market 2.20%
article 1.10%
bedtime 1.10%
earth + n. >>共 119
tremor 11.36%
mover 6.23%
orbit 4.40%
color 4.03%
movement 3.66%
summit 2.56%
slide 2.20%
move 2.20%
wall 1.83%
floor 1.83%
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