EVERYDAY SCIENCE

Detailed explanation-1: -Seismologists who focus on observation record and analyze data from the thousands of earthquakes, both big and small, that occur around the world every year. They often work in observatories or analysis centers, which are usually built and supported by universities or national governments.

Detailed explanation-2: -Seismologists study earthquakes by looking at the damage that was caused and by using seismometers. A seismometer is an instrument that records the shaking of the Earth’s surface caused by seismic waves.

Detailed explanation-3: -The earliest responses include work by John Bevis (1757) and John Michell (1761). Michell determined that earthquakes originate within the Earth and were waves of movement caused by “shifting masses of rock miles below the surface."

Detailed explanation-4: -The oldest known seismoscope is Chinese and dates backs from 132. It was a large bronze device that dropped a ball into a bronze container (one of the eight frogs on the image above) every time an earthquake was detected, thus producing a loud sound.