Essay on Earthquake
An earthquake happens when parts of earth’s surface liberate energy from earth’s crust which move against each other that causes cracks in the ground. The movement of the plates inside an earth causes the land to shake. Earthquakes occur when two tectonic plates that are grinding against each other causes rocks to explode.
The earthquake spreads out as a shock waves, or seismic waves, from the focus. The waves get weaker as they travel further away from the focus. The Focus is a place from where an earthquake starts.
Seismograph is a machine used by scientists to measure earthquakes. It has a pen, a roll of turning paper and a metal of weight. When earthquake occurs the roll of paper start turning and the weight of metal holds the pen firmly. Then the pen makes lines on the paper and this shows the measurement of an earthquake.
Sometimes an earthquake has foreshocks. These are smaller earthquakes that happen in the same place as the larger earthquake that follows. Scientists can’t tell that an earthquake is a foreshock until the larger earthquake happens. The largest, main earthquake is called the mainshock. Mainshocks always have aftershocks that follow. These are smaller earthquakes that occur afterwards in the same place as the main shock. Depending on the size of the mainshock, aftershocks can continue for weeks, months, and even years after the mainshock.
Earthquakes cause extensive damage to buildings, homes, and other property. Earthquakes can also cause landslides in hilly and mountainous places. It does significant harm to both people and property. Furthermore, it contributes to soil liquefaction. This phenomenon reveals that water-saturated ground material loses its force and hardness, and the solid surface transforms into liquid, causing buildings and other structures to sink into these liquefied grounds.
Earthquakes can also cause fires in buildings and pipelines. When an earthquake occurs, it breaks electric cables and gas pipes, causing various sorts of equipment and buildings to become engulfed in flames. It also contributes to tsunamis in the oceans. The high sea waves are caused by an earthquake that occurs underneath the ocean.