Natural Disasters, July 8

1680 Cambridge Massachusetts Tornado
1730 A magnitude 8.7 earthquake causes a tsunami that damages more than 620 miles or 1000 kilometers of Chile’s coastline.

Tsunami’s are caused by an earthquake which releases a large amount of energy into the ocean. This sets up a wave with a very long wavelength. The base of a wave is approximately ½ of the wavelength and when the wave base touches the ocean bottom, the waves build in height and break. You can see this when you watch ordinary waves breaking on the beach. Just think when the wavelength is very long how high those waves can build. This is what carries ships miles inland and can cause destruction and death far from shore. The best thing to do is retreat to higher ground.

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