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Taipei, September 21, 1999.




FAULT LINES AND
 EARTHQUAKES
Faults
Cracks in the earths crust along which
movement takes place.
There are three
different kinds of faults!
Dip Slip Fault




At diverging boundaries, the force stretches the
crust. When the stress is too much,
the rock breaks and one block moves down a sloping
crack. This is called a dip-slip fault.
Reverse Fault
                At a convergent
                boundaries the crust
                is compressed.
                When the stress is
                too much the
                rock breaks and one
                block moves up a
                sloping crack. This is
                called a reverse
                fault.
At transform boundaries the crust grinds against itself as
plates move horizontally past each other. When pressure
builds and then releases, it is called a strike-slip fault.
Faults in action
Earthquakes
A violent shaking of the Earths crust caused
by the release of built up energy at a plate
boundary. What are earthquakes?
Earthquakes happen when stress builds, plates
push, pull and strain against each other. When
plates slip or the lithosphere breaks, there is a
sudden jolt of energy that moves through the crust.
These waves of energy are called seismic waves.
Plate Movement


Seismic Waves



                                        Epicenter

                                The point on the surface
                             directly above the focus. The
                              seismic waves are the most
                             intense at this point because
                             of their close proximity to the
                                         focus.
                 FOCUS

                         The point underground where the
                                  faulting occurs

  There are three types of seismic waves 
  P, and S waves (body waves) and surface
  waves.
Surface waves, the
The initial jolt comes                                  slowest wave, move
                          The slower and stronger
from a P or             secondary or shear wave       close to or on the
primary wave. It          arrives after the P         surface. The Raleigh
travels in a fast         wave, shaking the ground      wave shown above
longtitudal fashion.      in a crosswise and vertical   has similar
They can pass             motion. S waves             properties to an
through both solid        cannot travel through the     ocean wave and can
                          outer core because they       cause severe
and liquid rock. They
                          cannot exist in molten        damage to larger
are generally felt as a                                 structures. Surface
bang or thump             rock.
                                                        waves
How do scientist measure seismic waves?
Scientists use an instrument called a
seismograph.
How do scientist express an earthquakes size or
magnitude?
Scientist use a scale called the Richter Scale.




             An earthquake measuring 7.5 on the Richter
             Scale is a major earthquake.
The September 21, 1999 earthquake that hit Taiwan measured 7.6
on the Richter Scale. The epicenter was in Nantou County in
central Taiwan, 150 km south of Taipei. The whole island suffered
catastrophic damage.
More information on 921 Earthquake
Some more information on the 921 earthquake
Ad

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Earthquakes and Faults

  • 1. Taipei, September 21, 1999. FAULT LINES AND EARTHQUAKES
  • 2. Faults Cracks in the earths crust along which movement takes place.
  • 3. There are three different kinds of faults!
  • 4. Dip Slip Fault At diverging boundaries, the force stretches the crust. When the stress is too much, the rock breaks and one block moves down a sloping crack. This is called a dip-slip fault.
  • 5. Reverse Fault At a convergent boundaries the crust is compressed. When the stress is too much the rock breaks and one block moves up a sloping crack. This is called a reverse fault.
  • 6. At transform boundaries the crust grinds against itself as plates move horizontally past each other. When pressure builds and then releases, it is called a strike-slip fault. Faults in action
  • 7. Earthquakes A violent shaking of the Earths crust caused by the release of built up energy at a plate boundary. What are earthquakes?
  • 8. Earthquakes happen when stress builds, plates push, pull and strain against each other. When plates slip or the lithosphere breaks, there is a sudden jolt of energy that moves through the crust. These waves of energy are called seismic waves.
  • 9. Plate Movement Seismic Waves Epicenter The point on the surface directly above the focus. The seismic waves are the most intense at this point because of their close proximity to the focus. FOCUS The point underground where the faulting occurs There are three types of seismic waves P, and S waves (body waves) and surface waves.
  • 10. Surface waves, the The initial jolt comes slowest wave, move The slower and stronger from a P or secondary or shear wave close to or on the primary wave. It arrives after the P surface. The Raleigh travels in a fast wave, shaking the ground wave shown above longtitudal fashion. in a crosswise and vertical has similar They can pass motion. S waves properties to an through both solid cannot travel through the ocean wave and can outer core because they cause severe and liquid rock. They cannot exist in molten damage to larger are generally felt as a structures. Surface bang or thump rock. waves
  • 11. How do scientist measure seismic waves? Scientists use an instrument called a seismograph. How do scientist express an earthquakes size or magnitude? Scientist use a scale called the Richter Scale. An earthquake measuring 7.5 on the Richter Scale is a major earthquake.
  • 12. The September 21, 1999 earthquake that hit Taiwan measured 7.6 on the Richter Scale. The epicenter was in Nantou County in central Taiwan, 150 km south of Taipei. The whole island suffered catastrophic damage. More information on 921 Earthquake Some more information on the 921 earthquake