GEOLOGY

Detailed explanation-1: -When an earthquake or explosion occurs, part of the energy released is as elastic waves that are transmitted through the earth. The waves are then detected and recorded by seismograms, which measure, amplify and record the motion of the ground.

Detailed explanation-2: -As discussed in Lesson 5, earthquakes occur when elastic energy is accumulated slowly within the Earth’s crust as a result of plate motions and then released suddenly at fractures in the crust called faults. The released energy travels in the form of waves called seismic waves.

Detailed explanation-3: -Explain to students that earthquake energy travels in the form of waves. These waves are called seismic or earthquake waves. There are different kinds of earthquake waves: body waves and surface waves. Body waves pass through the interior of the Earth whereas surface waves travel along the Earth’s surface.

Detailed explanation-4: -A seismic wave is a wave of acoustic energy that travels through the Earth or another planetary body. It can result from an earthquake (or generally, a quake), volcanic eruption, magma movement, a large landslide, and a large man-made explosion that produces low-frequency acoustic energy.

Detailed explanation-5: -Seismic waves are waves that travel through or over Earth. They are usually generated by movements of the Earth’s tectonic plates (earthquakes) but may also be caused by explosions, volcanoes and landslides. They can tell us much about the Earth’s structure.