detect – v. discover or notice something

mobile – adj. able to be moved freely or easily

seismographic – adj. relating to equipment used to detect and measure earthquakes

tectonic plate – n. one of the parts of the earth's surface that move in relation to each other

primary – adj. earliest in time or order

tunnel – n. long passage that runs underground or through a mountain

elevator – n. a device that moves people and things up and down inside a building

screen – n. the flat panel area on an electronic device

accurate – adj. correct or exact