GEOLOGY

Detailed explanation-1: -Seismographs are devices that are used to measure ground motion caused by earthquakes. Scientists can use seismographs and seismic wave arrival times to find the epicenter.

Detailed explanation-2: -The seismometers are shown as green dots. The calculated distance from each seismometer to the earthquake is shown as a circle. The location where all the circles intersect is the location of the earthquake epicenter.

Detailed explanation-3: -A seismometer is the internal part of the seismograph, which may be a pendulum or a mass mounted on a spring; however, it is often used synonymously with “seismograph". Seismographs are instruments used to record the motion of the ground during an earthquake.

Detailed explanation-4: -A seismograph is a device for measuring the movement of the earth, and consists of a ground-motion detection sensor, called a seismometer, coupled with a recording system. A simple seismometer that is sensitive to up-down motions of the earth can be understood by visualizing a weight hanging on a spring.

Detailed explanation-5: -The center of the circle will be the location of your seismograph. The epicenter of the earthquake is somewhere on the edge of that circle. Do the same thing for the distance to the epicenter that the other seismograms recorded (with the location of those seismographs at the center of their circles).