Bam Earthquake 2003
Living within a dynamic system requires humans to use scientific knowledge to predict and prepare for large scale events, since not a day goes by without a change in the Earth: The continents drifting away, land rising, and faults. This essay will focus on one main thing: earthquakes. An earthquake measured magnitude 6.6, according to United States Geological Survey, which happened in Bam, Iran in the year 2003. This earthquake was caused by a “buried” fault in the Earth, said to rupture every 2,000 years. After rupturing, it will heal over a period of years (Jet Propulsion Laboratory, National Aeronautics Space Association, 2009). This earthquake was called a national tragedy by the Iranian President Khatami (British
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These faults are the locations of earthquakes, and earthquakes come with seismic waves. The first wave to hit the surface destination is the Primary wave, a wave which moves in a curve formation and pushes outwards from the Earth core, making a building "jump". The next wave reaching the destination in an earthquake is the secondary wave, which pushes things aside as it goes away from the core, in a "snake" motion. The last wave to hit the destination point is the Surface Wave, moving in a curve formation along the surface. This is the most devastating wave which moves in all directions, usually responsible for all the destruction in an earthquake. The reason that the Primary Wave, which moves in a curve, comes before the Secondary wave is that the materials the Earth is composed of affect the velocity of the Secondary Wave, making its direct movement have lower velocity than the Primary Wave. These seismic waves and Earth faults are the cause of earthquakes.
Earthquakes happen in different places and