The point within the earth where is the Waves originate is called focus and from the focus and from the book of the vibration spread in all directions they reach the surface first eight-point immediately above the focus at this point is called epicenter.
It is at the epicenter where a shock of an earthquake is first experienced.it is, however, evident that no earthquake can possibly originate at a meer point alone. An earthquake occurs beneath the surface of the earth. Where the rocks and suddenly, of course, after the prolonged build-up of stresses. They are often associated with fault- lines, which provided is the zone of fracture and easy yielding. Earthquake emerges various depth, which may be anywhere in the crossed or age 700 kilometers down into mental.
Due to sudden yielding of Rock to stress, a wave of energy is sent out through the earth. These waves of energy are called seismic waves. Seismic wave emerges in the focus of an earthquake and radiated outward, like ripples produced when the stone is thrown into a pool of water, gradually losing energy.it is known that the seismic waves pass through Earth is mainly because of its being an elastic body. When stress is applied become the form more and more, what to do when the stress is removed it returns to its original shape. If the stress applied is to create the elastic body yield permanently. The seismic wave to been considered to be the outcome of elastic deformation of Rock.since since all elastic bodies can be subjected to types of deformation comparison and shear the seismic wave is also related to these.
Primary waves-these are longitudinal waves similar to sound waves. Rocks vibrate parallel to the direction of Propagation. In the same direction as wave moving. This kind of motion leads to the longitudinal compression and refraction of the substances.
good
You must be logged in to post a comment.