Earthquakes

• Innercore - the innermost layer of Earth.
• The Inner-core is made out of iron-nickel alloy.
• The outer-core is made out of iron, nickel, sulfur, and oxygen.
• The metals within the outer-core flows around the whole layer producing a magnetic-field and that acts as the Earths Shield.
• The third layer is the Mantle. It is also made out of iron, oxygen, silicon, magnesium, and aluminum.
• Crust - The outermost and thinnest layer of Earth.
• Continental-Plates - The continents on Earth.
• Oceanic-Plates - Are beneath the ocean.
• Transform Boundary - When two plates slide past each other.
• Convergent Boundary - This is where two plates move toward each other.
• Divergent Boundary - Where two plates are moving away from each other.
• Earthquake - Is The shaking of the surface of the earth.
• Tectonic Earthquakes - It occurs when plates bump or scrape as they slide along each other.
• Hypocenter - This is where the pressure has built up. This is also known as focus.
• Focus - The point of origin of the earthquake.
• Magnitude - Amount of energy released by an earthquake.
• Seismograph - Shows how large an earthquake was.
• Intensity - Is the strength of an Earthquake.
• Rossi-Forel Scale - One of the first seismic scales to measure the intensity of the Earthquake.
• • PH - Philippine
  • I - Institute
  • VOL - Volcanology
  • CS - Seismology
• Scarcely-Perceptible - Perceptible to people under favorable circumstances.
• Slightly-Felt - Felt by a few individuals.
• Weak - Felt by many people indoors.
• Moderately-Strong - Felt generally by people indoors and some people outdoors.
• Strong - Generally felt by most people.
• Very-Strong - Many people are frightened.
• Destructive - Most people are frightened and run outdoors.
• Very-Destructive - People are panicky.
• Devastating - People are forcibly thrown to the ground.
• Completely-Devastating - Practically all mad-made structures are destroyed.
• Ground-Rupture - The earthquake breaks the ground apart.