What is a seismic gap

what is a seismic gap

Earthquakes

MAIN IDEAS

  • Several types of faults occur in the crust.
  • The faults break due to accumulated stress along the fault. The sudden release of energy is called an earthquake.
  • The energy is released as seismic waves that travel away from the earthquake location. Two major types of waves are produced: body waves and surface waves.
  • The waves can be measured by an instrument named a seismometer. The timing and amplitude of the seismic waves can be used to determine the location and magnitude of the earthquake.
  • Earthquakes commonly occur along plate boundaries.
  • These waves also provide information on the structure of the earth. A clear layering is recognized.
  • INTRODUCTION

    In this lab we will study

    the three types of faults that can form. Next, we will look at how and earthquake forms along a fault. Then we will see how a seismometer records an earthquake and how the location and magnitude are determined. Finally we will look at the relationship between earthquakes and plate tectonics.

    A fault is a fracture or zone of fractures slong which there has been displacement of the rock on either side of the fracture. Faulting is a basic mechanism by which rocks deform. Faults are generally planar and are classified according to the nature of the movements as observed perpendicular to the plane of the fault. Four common types of faults are shown below. Tensional forces cause normal faulting, whereas compressional forces cause reverse and thrust faulting. Notice how the relative movements along the faults differ and are caused from the different forces.

    Source: www-rohan.sdsu.edu

    Category: Forex

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