Geology 101 Notes – 10 PDF

Preview

Summary

These are class notes that I typed directly after class from hand written notes I wrote during class. I go through this two step process to ensure accuracy and enhance organization....

Description

Geology 101 Notes – 10.1.14 Trenches  Formed by subduction zones  Deep trenches=dense=far traveled=old age Plate tectonics and earthquakes  Every plate boundary creates earthquakes, divergent/convergent/transform  Deep earthquakes are only created by convergent plate boundaries  Depth of the earthquake doesn’t affect strength o Depth does affect how much we feel the earthquake Tectonics of western United States  Juan de Fuca plate has a divergent plate boundary with the pacific plate and a convergent plate boundary with the North American plate o Cascadia subduction zone o Very quite, not many earthquakes Ocean-ocean convergent boundary  Older and denser plate is the one that subducts  Forms island arc Continental-continental convergence  Cant shove one under the other o Too thick, too buoyant (not dense)  The lithospheres collide, stack and uplifts o Comes together and goes straight up to form very tall mountains (mount Everest)  Top of Mt. Everest is made of limestone o Limestone only formed at the bottom of the ocean Transform plate boundary – fracture zones  Side to side motion  Occurs in association with divergent plate boundaries (usually)  No volcanic activity  Connect segments of mid-ocean ridges San Andreas fault – an example of a transform boundary  Between the pacific plate and the North American plate  Some earthquakes  Not destroying or creating lithosphere...