Tsunami Deposits Demonstration


Today we’re going to demonstrate to you
how a tsunami creates a deposit near the coastline. This is our tsunami tank. On the side we’ve got the deep ocean and we reach over here to the shallow area. We’ve got the beach,
the sand dune, and this area over here is normally too
high for the sea to reach. A tsunami is a large displacement of seawater usually caused by an earthquake. I’m going to use this plunger to create a small tsunami. you can see here that the tsunami has gone over the sandbank and created a layer on the grassy area. This layer contains material that’s been washed up
from the beach like sand and shells and other beach
material. Over a long period of time the tsunami material will be covered over by vegetation represented by this green layer here. We are going to prepare for our next tsunami with some more beach material. Now we have our beach material, we will create out second tsunami. Our tsunami has created a second layer of beach material. And again over the time vegetation will cover the tsunami material. You can see the tsunami deposits have been completely covered by the vegetation layer. This means that the tsunami deposits are often very
difficult for scientists to find. So they go and search in likely coastal areas, looking for them. They might drill a small borehole or dig a
trench to look for evidence of these tsunami
deposits. When they locate them they can use the
plant material and the shells to help date when these tsunamis occurred. Once they have a history of past earthquakes, the scientists can help with planning around coastal areas in case the future earthquakes or
tsunamis.

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