Crash Course for Earthquakes(Waves)
Yea man, its me again. Doing blogging early in the Wednesday. Why? Because i have a Geography paper later in the afternoon and i am supposed to be studying. But what am i doing now?? Ever since i started to blog again, jus had this feeling not to let it die again. But sometime i still really think that this is quite a chore. Nonetheless…
Hahas. For the past two days, i guess i screwed up all those papers. Its the first time i have this uncertaintity when i take these papers. But i guess its natural for J1s to be feeling like that, reckoning that even if u study the picture at the end of the day will be somehow identical, so…..
Damm it, Spain lose to France by 2 goals even though the latter was thought to be umm…
Earthquake- First seismic wave that arrive on the seismograph is the P-Wave(primary wave). The P-wave is a longditunal wave, it travels through the body of the earth and is the fastest wave. It has a speed of 4-7km/s. The P-Wave vibrates back and forth parallel to the direction of the Wave.
Second wave that occur is the S-Wave (secondary wave). It is the second fastest sesimic wave and it travels at about 2-5km/s. The S-wave is a transverse wave and it also travels through the body of the Earth. The S-wave vibrates in a up and down motion, where it is perpendicular to the direction of the wave. Because of the vertical displacement motion, the S- wave is quite a destructible wave that can cause many severe damages to buildings.
The next wave that will occur is the L-waves. These waves are known as the surface wave. It is because these wave move around the Earth, instead of through the Earth. They are the slowest wave but in the same time the most dangerous wave.
One type of the L-waves is the Love-wave. The love wave is similar to the S- wave, except that it doesnt have any vertical displacement. The Love waves vibrate parallel to the Earth’s surface but it is perpendicular to the direction of the wave is moving. This vibration can cause many buildings to fall as the side vibrations tend to knock buildings off their foundations and their support.
The next type of Surface wave is the Rayleigh wave. The rayleigh wave moves in a backward circular, rotating motion. The force produced is both horizontal and vertical. The rayleigh wave tend to be destructive as they produce more ground motion and takes a slightly longer time for the waves to pass through.
Well well…. Thats all for Earthquake.. Good luck Geographers, both JC and Secondary hope that helps
, it came from my brain, not notes
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部落格上的所有,只是本人的个人意见与看法.