A Discussion On Earthquakes :: essays research papers

A Discussion On Earthquakes Perhaps Mother Nature offers no greater force than that of the earthquake. Across the span of time, earthquakes have been recorded for their incredible destructive forces, and their abilities to awe mankind with their unparalleled force. Earthquakes can often strike without any notice, leveling large cities and killing scores of innocent people. Not only can earthquakes bring harm to society through these methods of destruction, but they can also cause millions of dollars worth of damage to the areas they destroy, causing economic chaos. An earthquake is a natural phenomenon, occurring throughout the history of the world. Descriptions as old as recorded history show the significant effects earthquakes have had on people's lives. Long before there were scientific theories for the cause of earthquakes, people around the world created folklore to explain them. Until recent times, science has not had a complete understanding of how earthquakes are caused, and what can be done to predict when they will strike. This essay will discuss how earthquakes are formed and occur, how scientists can more accurately predict the arrival of earthquakes.   Ã‚  Ã‚  Ã‚  Ã‚  Before contemplating how earthquakes might possibly be prevented, it is essential that the process and formation of and earthquake be understood. Earthquakes are caused when the earth's crustal plates move, rub, or push against each other. The earth's crust (the outer layer of the earth) is made up of seven major plates and approximately thirteen smaller ones. The name plate is used to describe these portions of the earth's crust because they are literally â€Å"plates† or sections, composed of dirt and rock. These plates float on molten lava, called magma. Since the plates are floating on magma, they can slowly move. The place where friction occurs between plates is called a fault. A fault is a crack in a plate or a place where two or more plates meet. An example of a fault where two plates meet is the San Andrea's fault in California, where the Pacific and North American plates meet. The plates are about 30 miles thick under land and can be one to five miles thick beneath the ocean. The plates move because of convection currents. Magma has currents like the ocean does, that move in a circular motion beneath the plates. When two plates are pushing against each other, they are constantly building up tension on the fault. When two plates finally slip, they release a great amount of energy in the form of shock waves. These shock waves cause vibrations, which in turn cause the ground around the fault line to move and shake.