Physics Essay: Earthquakes

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  • Topic: Earthquake, Seismic wave, Seismology
  • Pages : 5 (1507 words )
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  • Published : October 6, 2011
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This essay is going to be about the natural disaster called earthquakes. There has been developed a new technique to prepare the human race for earthquakes. In this essay, the possibility of getting to know when an earthquake is going to happen is going to be discussed. How is science going to be able to create a better world, if there’s a natural phenomenon that can’t be changed? Plate tectonics-Wikipedia, the free encyclopedia

http://en.wikipedia.org/wiki/File:Plates_tect2_en.svg

Earthquakes are produced by the sudden energy released by the Earth’s crust, as seismic waves. The seismic activity is calculated within the frequency of the earthquake, this is measured with a seismograph. The magnitude of an earthquake is measured in the Richter scale (a scale of 1 to 10 formerly used to express the magnitude of an earthquake on the basis of the size of seismograph oscillations). The magnitude is measured and recorded by seismographs, in whole numbers. When it was first created, it was only measured from 1 to 9, but nowadays the range of the scale has no limits because bigger and stronger earthquakes are happening. The movement of tectonic plates causes earthquakes; there are seventeen in the world. Most of the boundaries are hidden under the ocean but they can be found using satellites. Seismology is the study of earthquakes and seismic waves. Seismic waves are the waves created when rock in the tectonic plagues break and create energy because there is an explosion. This energy travels through earth and it is recorded using seismographs.

The ionosphere is one of the portions in the upper atmosphere. This part of the atmosphere is located from 80 km over earth to the 640 km over it; it is a shell of electrons. One of its characteristics is that the radio waves crash in it and the ionosphere returns them to the Earth; this allows radio waves to travel long distances. The ionosphere has a big magnetic field due to the fact that light from the sun collides in here and gives atoms energy, in this area the northern lights and the shooting stars happen. The ionosphere keeps changing, when it changes the weather, the electromagnetic and Earth’s magnetic field is affected. The change is displayed in an ionogram, where the height is plotted against the frequency of the electron density.

The Taiwan Earthquake (921) happened the 21st of September of 1999. Taiwan is located on the border of the Eurasian Plate. The epicenter of this earthquake was in the middle of the island and other three seismic movements were recorded in the island. The human loses were of 2, 416 and over 11,000 people were injured. The earthquake had a magnitude of 7.3 in Richter scale, one of the aftershocks had a magnitude of 6.8 on Richter scale; this made weak buildings collapse and it killed lots of other people. About US$9.2 billion was worth the damages caused. Photos that work- 921

http://fiveblocks.wordpress.com/2008/06/08/photos-that-work/

Liu Jan-yend and Yen Horng-yan found a new technique in Taiwan. This new technique is able to detect earthquakes and tsunamis, an hour and a half before the actual seismic movement happens. They found out that there is a connection between the movement of the ionosphere and the earthquakes, for example:” when there is a vibration of 80 km in the ionosphere, there is going to be an 8 meter movement on Earth”. By noticing the change in the ionosphere, the place and the vibration of the possible earthquake can be detected. The scientists explained using previous data, that the 1999 Taiwan Earthquake could have been predicted and thus could have prevented lots of casualties. The discovery was published in the “Journal of Geophysical Research Atmospheres”.

One of the benefits of this new discovery, as it has been stated is that there is the possibility of predicting an earthquake and saving millions of life. If people were prepared, they would make a certain decisions to be in a safe place when the...
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