Definitions For Earthquakes Flashcards
What is the epicentre
The point on the earths surface directly above the focus
What is the focus
Place in the earths crust where the earthquake originates
What is the fault
Fractures between two blocks of rock
What is the Benioff zone
Region in the subduction zone where the most pressure build up and friction occur
What are primary effects of earthquakes
Immediate impacts
What are secondary impacts of earthquakes
Occur after the initial event
What is liquefaction
Occurs when compacted sediment loses strength and stiffness due to an applied stress from earthquake shaking
Make solid material behave like a liquid
However liquefaction requires a degree of soil saturation to occur
Causes buildings to collapse as well as sink holes open up, endangering lives and infrastructure
Mexico City lose sandy soil 1970 mag 8
