Video homework - Japan Tsunami 1 PDF

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GEOG 2152: Geography of Hazards

Video: Japan Tsunami 1. Explain how the interaction between the Eurasian plate and the Pacific plate led to the earthquake. For how long does this type of interaction occur before a major earthquake happens? Huge earth quake 8.8 magnitude over to 9. Source was off of Japan’s coast, earth is distorting beneath the oceans. Continent size tectonic plates, Japan lies on the point where Pacific plate rams into Eurasian plate that is constantly moving. Japan is on the Eurasian plate that is going over the Pacific plate and there is immense stress that reaches a threshold and then snaps. The Pacific plate moves under and towards the Eurasian plate and the built-up stress and momentum cause the huge earthquake. This interaction occurred over 200 years. Earthquake was supposed to last only a few seconds, but it kept going. The larger earthquake starts going and doesn’t stop and gets bigger.

2. Describe the changes in speed and appearance of a tsunami wave as it approaches a shore.

Pressure increases as waves approach a shore. It his north first, then south, then north again.

The depths of the sea bed varied over time which caused height and intensity varied. Deeper

Oceans cause tsunami waves to spread faster. Cliff and bays on shore line varies on how the

waves behave.

3. What caused debris from the tsunami to catch on fire?

The giant tsunamis wave caused the damaged and caused materials such as gas and gasoline

from factories. In those oil tanks, gas cylinders to leak. Moreover, the tsunami swept away

amounts of objects which caused collision between objects and sparks from broken electric

device.

4. What new feature did the tsunami produce in Kahoku? Explain how the geography of that area made this a particularly remarkable occurrence.

A huge lake formed caused by the melt of sea

 Created a huge salt water lake among mountains miles far from the sea

5. What is Cascadia? Where is it located and why is it a concern?

Cascadia is a vast and volatile fault line, located off the coast of British Columbia; plate driving beneath another, squeezing and compressing it (tremendous pressure builds. Could rupture in a huge magnitude 9 earthquake leading to a Mega-quake would create a tsunami similar to Japan)...