Earthquakes & EQ waves Earthquake Seismic wave studies-layered interior of earth Earthquake-shaking of earth caused due to release of energy which generates the waves.
Earthquake waves Recorded by seismograph. Two types of EQ waves- Body waves and surface waves Body waves-generated due to release of energy at focus & move in all di- rections travelling through body of earth. Body waves interacts with surface rocks to produce surface waves Surface waves moves along the surface and therefore it is more destruc- tive. . .
Two types of body waves 1. P-wave- >moves faster->first to arrive at surface-> similar to sound waves->travel through all mediums ->speed order S>L>G. 2. S-wave->arrive at surface with time lag-> travel through solids on- ly-> more destructive.
Epicentre Plate movement Focus Seismic waves
P wave compressions dilations wave direction S wave wavelength
Why does Earth shake? Release of energy along fault->pressing of overlying rock strata-> friction >deformation in rocks->sliding over each other Focus or Hypocenter-point where energy is released. Epicenter-point on the surface nearest to focus.
2nd year B. Tech. Student, Design head of Bombay technologist of ICT, dancer, painter, interested in research and like to help people...