Geography 2152F/G Lecture Notes - Fall 2018 Lecture 1 - Lithosphere, Himalayas, Seafloor spreading
21 Sep 2018
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Processes and natural hazards: natural hazards can arise from three main processes: Examples of recent catastrophes: hurricane katrina (new orleans, tsunami (thailand, earthquake (haiti, oil spill (gulf of mexico, tsunami (japan) Impact of a hazard is a function of both its magnitude (i. e. energy released) and frequency: relationship between magnitude and frequency. It can also be affected by other factors (geology, land use, population density, etc. : magnitude-frequency concept, there is an inverse relationship between magnitude and frequency, as one variable increases the other decreases. Understanding the risk of hazards: the history of an area can provide insight on its risk of hazards. The process is driven by earth"s internal energy. Plate tectonics: the crust forms the upper part of the lithosphere and is broken into fragments (plates, two types of crust, oceanic: dense, thin (avg. 7 kilometres thickness: continental: relatively buoyant, thick (avg.
