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some more fact about the earth........ articles to control stress n full diet plan articles...................... this is article i have made TELL ME MORE ABOUT EARTHQUAKE When we think of an earthquake, we think of building toppling, huge cracks opening up in earth,and so [login to view URL] is there to be "measured?" Well,an earthquake is a trembling or vibration of the earth's [login to view URL] it is these vibration that are [login to view URL] cause of a earthquake usually a "fault" in the rocks of earth crust, a break along which one rock mass has rubbed on another with great force and in the [login to view URL] vibrations may travel thousand of miles, which is why an earthquake in Tokyo can be detected and measured in England. Earthquake vibration consist of three or more types of wave motion, which travel at different speed through the earth's rocky [login to view URL] waves move in different [login to view URL] primary waves vibrate length wise;the secondary waves crosswise;and the long waves travel around the earth [login to view URL] long waves moves more slowly,but they have larger motion and cause all the damage that can be seen by man. Instrument called seismographs placed in different parts of the record vibrations every day in the year,for the earth crust is never [login to view URL] record sheets of two or more seismographs help seismologists to see where the quake took place. A seismograph is delicately hung weight,which remains still when an earthquake shakes the surrounding parts of the [login to view URL] other words this weight,is a [login to view URL] the chart moves,a record is made on it by by the weight. Record sheets indicates the time the wave arrives,the force of their motion and can even indicate the direction from which the waves comes