Have
you experienced a natural disaster events? The terrible disasters
including for our lives is a earthquake, what can we know about
earthquake? Earthquake was felt vibrations in the earth's surface,
which is caused by the seismic waves from the earthquake source of
the layer of the earth's crust, or the center of the earthquake
source that is located in the earth called hiposentrum, while the
area on the surface of the earth or on the sea floor where the center
is the epicentrum of earth tremors propagate, according to it's
hiposentrum depth, earthquakes can be classified in the deep
earthquake, middle earthquake, and shallow earthquake. While
according to the waves or vibrations the earthquake can be classified
into primary wave, secondary wave, and the length wave. A tool to
measure earthquakes is the seismograph, while the study of
earthquakes is seismology.
Earthquakes
can occur in a place suddenly without any signs as early events, the
causes of the earthquake was a crack rock and release system. In a
place then move and change rapidly, due to pressures from within the
earth's energy, or from outside the earth, based on the causes,
earthquakes can be differentiated into three types, at first is a
tectonic earthquakes. Tectonic earthquakes are earthquakes that
caused by dislocation or displacement of earth layer shift occurs
suddenly in the layer structure of earth. At the second is volcanic
earthquakes, are earthquakes that caused by the collapse of the roof
of a cave or tunnel underground mines.
Earthquakes
can occur in various places, earthquakes have varying strengths,
namely the magnitude of low, medium and high or poweful, earthquakes
can cause great physical damage, such as holises collapsed, the walls
collapsed, roads were cut off, the dam burst, and large floods,
earthquakes can also cause secondary disasters, such as interruption
of drinking waternetwork, electricity, telephone, fire, explosion and
drought, in case of a strong earthquake in the ocean can cause a
tsunami wave.
