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CONTENT
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- Introduction
- Earthquake Survival Guide
- Earthquake Preparedness Check List
- Earthquake Daily Reports from the US Geological Survey Service
- Earthquakes trend
- Do we are approaching the 2012 doom year?
- Earthquake Definitions Glossary
- The Ritcher Scale
Body Waves
Body wave are waves that travel from the interior of the Earth toward the surface, they are compose by two kind of waves P waves and and S waves
“P” Waves, also called Primary Waves have elastic traveling characteristics as sound waves, they can travel in gas, liquid or solids like on earth, These waves are the first to be detected by seismographs and alarms. These are compression waves classified as body waves, these waves travel from the inner Earth to the surface.
“S” Wave also called Secondary Waves travel with amplitude perpendicular to their propagation direction, as showed in the picture, these are classified as body waves, they also travel from the earthquake epicenter toward the surface, these waves are more destructive than the primary waves but fortunately travel at lower speed.
Surface Waves
Surface wave are waves that travel near or at the surface of the earth on a horizontal path, waves in this category are Love and Raleigh waves.
Love waves are surface waves with a transversal and longitudinal component that travel horizontally to the Earth surface, are produced by the circular motion of particles on a clockwise direction. The particles do not travel, they do communicate the energy in circular motion generating the waves as seen on water and liquids.
Raleigh waves are also surface waves in solids with transversal and longitudinal
components in which the wave is produced by an counter-
Basic Earthquake Glossary, Part 2
Force
Force
Impact
Force
Earth Surface Shaking in Both Directions
Wave
Propagation
Impact Force
Earth Surface
Wave Traveling
Direction
The effect of the P waves on the earth surface is an up and down movement
Compression wave, time 1
Traveling compression
wave at time 2
Wave Propagation
Direction
Time 1
Time 2
Time 3
Love Waves Train
Raleigh Waves Train
Direction
