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TELL ME MORE ABOUT EARTHQUAKE
When we think of an earthquake, we think of building toppling, huge cracks opening up in earth,and so [url removed, login to view] is there to be "measured?"
Well,an earthquake is a trembling or vibration of the earth's [url removed, login to view] it is these vibration that are [url removed, login to view] 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 [url removed, login to view] 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 [url removed, login to view] waves move in different [url removed, login to view]
primary waves vibrate length wise;the secondary waves crosswise;and the long waves travel
around the earth [url removed, login to view] 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 [url removed, login to view] 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 [url removed, login to view] other words this weight,is a [url removed, login to view] 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
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