Earthquake is one of the most destroying natural disasters. Unluckily it often happens in several regions. Recently a horrible earthquake has shaken West Sumatra. It has brought great damages. Why did it occur? Do you know how an earthquake happens?
Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves. It make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. They don't just slide smoothly. The rocks are still pushing against each other, but not moving. After a while, the rocks break because of all the pressure that's built up. When the rocks break, the earthquake occurs.During the earthquake and afterward, the plates or blocks of rock start moving, and they continue to move until they get stuck again. The spot underground where the rock breaks is called the focus of the earthquake. The place right above the focus is called the epicenter of the earthquake. Let me remind you my experience during an earthquake last week. When the earthquake happened, I was on my car. I was driving home from my vocation to Bali. Suddenly my car lunched to one side, to the left. I thought I got flat tire. I did not know that it was an earthquake. I knew it was an earthquake when I saw some telephone and electricity poles falling down to the ground, like matchsticks.
Then I saw a lot of rocks tumbling across the road. I was trapped by the rock. Even I could not move my car at all. There were rocks everywhere. There was nothing I could do but left the car and walked along way to my house, in the town.
When I reached my town, I was so surprised that there was almost nothing left. The earthquake made a lot of damage to my town. Although nothing was left, I thanked God that nobody was seriously injured.