Earthquakes and Seismic Waves Brendan Gubbini, Rocco Stralle, and Michael Phillips Mrs. Smith 4th April 8, 2011
Basic Background Information
- Series of Vibration in the earth’s crust.
- How are earthquakes measured?
- They are measured by a Richter scale.
- What does magnitude mean?
- magnitude measures the energy released at the source of the earthquake.
- How is magnitude measured?
- They are measured by a seismograph.
Damage caused by Earthquake
- What are earthquake waves called?
- What two types of seismic waves are there?
- What two types of body waves are there?
- Solid, Liquid, and Gas, and through the Body Of Earth
- A mechanism used by Geologists to explain Earthquakes and Surface ruptures, seen when deep faults break through Earth’s surface.
The Tohoku Earthquake
- Towards Northeast part of Honshu, Japan
- The magnitude of this quake was
Effects on the environment/earth
- Pacific Plates moved 20m westward
- Shifted on Earth’s axis about 6.5 inches
- Somehow caused the Planet to rotate just a little bit faster, shorting the day about 1.8 millions of a second
Effects on the People of Japan
- Thousand houses were destroyed
Effects on the Economy of Japan
- Production is slowly declining
- Thousands of houses were destroyed
- Factories are in un-workable conditions
- One interesting fact about this earthquake is that it moved several GPS sensors. This will require … resetting GPS because of japan
- How does elastic rebound explain this movement? Ruptures result to strong ground shaking.
- A series of waves caused by an earthquake or other disturbances.
- How do tsunami waves appear at sea?
- When undersea earthquakes disrupt water surfaces
- How high can tsunami waves be?
- Between 30 to 50 feet they can reach up to 100-300 feet
- How fast can tsunami waves move?
- Anywhere from 3omph to about 500 mph