EESA06H3 Lecture Notes - Lecture 6: Mass Wasting, Oceanic Crust, Stratovolcano
Document Summary
A volcano erupting is not a hazard; only when it threatens human interest is when it is a hazard. Risk is how severe an event is and the impact it will have on humans. Poor communities will be more socially vulnerable than rich communities. Disaster is within a specific geographic area (regional, national) Catastrophe affects far beyond the area that is directly effected. The heat within the earth causes a lot of hazards at the boundaries of these plates. Magnitude 10 earthquake is very uncommon, while smaller disasters don"t happen very often. The larger the disaster, the less likely it is to happen. You get basaltic/mafic magma at a hot spot; nothing to do with the boundaries. Only reason hawaiian islands exist is because there is a mantle plume there and it burns through the plate. The magma at the plumes is mafic (rich in iron and magnesium)
