INT.SCI - MAPPING THE INNER EARTH

• Seismic waves are detected by highly sensitive instruments called ____________.

  Seismometers
• Seismic waves are recorded by ____________.

  Seismographs
• These seismic waves travel through the inner layers of the planet.

  Body Waves
• These seismic do travel so only on the surface. These waves are important in other aspects of geological studies such as earthquake damages and perceived strength, they do not provide information about Earth's interior.

  Surface Waves
• These are two types of seismic waves:

  Body Waves and Surface Waves
• Enumerate the two types of body Waves that radiate in all directions:

  Primary Waves and Secondary Waves
• These waves are the first to be felt on Earth's surface.

  Primary Waves or P waves
• These waves travel at speeds between 1.5 and 8 kilometers per second.

  Primary Waves or P Waves
• These waves are compressional waves; they shake the ground back and forth in the same direction the wave is moving.

  Primary Waves or P Waves
• These waves pass through solid and liquid sections of Earth but refract or bend as they pass through liquids.

  Primary Waves or P Waves
• These waves are transverse waves, which are felt in an up-and-down motion perpendicular to the direction of the wave.

  Secondary Waves or S waves
• These waves do not travel through liquids.

  Secondary Waves or S waves
• These waves travel about 60 to 70 percent more slowly than the P waves.

  Secondary Waves or S Waves
• These help map and characterize the layers of Earth.

  Seismic Waves
• He is a PHILVOCS director who said that is it "imperative that the country prepares for a possible movement of the West Valley Fault which could happen anytime soon."

  Director Renator Solidum
• They believe that mitigation nay be done by using hazard risk maps.

  PHIVOLCS
• What is the meaning of the acronym NOAH?

  Nationwide Operational Assessment of Hazards