Seismic Waves Aaron Kafkakis Ryan Harris Mrs. Smith Hour: 4 April 8, 2011
Basic Background InformationWhat is an earthquake?An Earthquake is what happens when two blocks of Earth suddenly slip or crack past eachother.How are earthquakes measured?Earthquakes are measured in Seismic Waves measured by Seismographs.What does magnitude mean?The size of an Earthquake is called its MagnitudeHow is magnitude measured?Magnitude is measured by the size of their Seismic Waves.
Damage Caused by EarthquakesBuildings suddenly collapseTsunamis begin to occurBuildings shake and shutter
WavesWhat are earthquake waves called?Seismic WavesWhat two types of seismic waves are there?Primary and Secondary WavesWhat two types of body waves are there?Love and Rayleigh Waves
Body WavesHow do P waves travel?They push and they pullHow do S waves travel?They travel side to side, and up and down.Which move faster?P-waves move faster.
Elastic ReboundA mechanism used by Geolgists to explain Earthquakes and suface ruptures.The Elastic Rebound occurs in Divergent Boundaries
The Tohoku EarthquakeThis quake occurred at :5:30 PMThis quake occurredIn Honshu, Japan.The magnitude of this quake was9.0
Effects on the environment/earth• Nuclear Wastes from Power Plants escape into the evironment• Many cities and Humans are heavily damaged• Large cracks and sinkholes .
Effects on the People of Japan• People do not have power from destroyed power plants.• Tsunamis flood cities in Japan.• Houses and buildings are toppled over.
Effects on the Economy of Japan• Many offices shut down and people lost jobs.• Food and water become scarce and polluted.• Fires burn down buildings and kill hundreds.
GPS Sensors• One interesting fact about this earthquake is that it moved several GPS sensors. This will require all of the GPS sensors to be rearranged.• How does elastic rebound explain this movement? Because the boundaries at the Elastic Rebound point shifted, moving Japan.
Tsunamis• What is a tsunami?A giant wave usually caused by an earthquake.• How do tsunami waves appear at sea?After an earthquake hits, the waves cause the water to rise up and move.• How high can tsunami waves be?About 50 to 250 feet high.• How fast can tsunami waves move? One hundred MPH in deep ocean water.