GEOLOGY

Detailed explanation-1: -Seismographs are instruments used to record the motion of the ground during an earthquake. They are installed in the ground throughout the world and operated as part of a seismographic network.

Detailed explanation-2: -The occurrence of seismic waves without deformation at the surface is clear evidence of active faults in the ground. Recording and analysis of these waves can be used to deduce information about the rupture process along the fault below the Earth’s surface.

Detailed explanation-3: -The surface where they slip is called the fault or fault plane. The location below the earth’s surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter.

Detailed explanation-4: -By looking at the seismograms from different recording stations, we can find out the epicentre of the earthquake. The signals arrive first at the closest station and last at the one furthest away. The time difference between the P-and S-waves tells us the distance the earthquake is from the seismometer.