Seismograph:

An instrument that records the motions of the Earth's surface.

A seismic monitoring station was set up on the hill top of the Coloane Island, with a set of Analog Seismograph at the beginning and later with an additional set of Digital Seismograph.

Whenever an earthquake occurs, the seismic waves will be detected by the Seismograph, process by the amplifier, and will be transmitted to the Center via wireless or telephone lines.

Quick Earthquake Quiz:

The first seismic instruments accurate enough to be used in the scientific study of earthquakes were invented in the 1880s in which country?