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1) volcano smoke more gas more, sometimes a bird which was flying to get the gas floating on air, and fell to his death!2) mountain swelling or tilt. Because the lava spewing out extra mountain cattle, causing swelling or tilted up, can be measured from the theodolite
.3) surface has a vibration. A power transmission noise more than usual. Measured from seismograph. Report to data rate increasing vibration
.4) dog or some kind of reptiles to panic. Because these animals can perceive the vibration of the ground better than humans.
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