ATOC 185 Lecture Notes - Convergent Boundary, Continental Crust, Plate Tectonics
19 Nov 2012
School
Department
Course
Professor
Document Summary
Earthquake shaking/vibration of ground rocks undergo deformation and break suddenly along a fault. (rocks break in a brittle fashion and then get offset. ) Plate tectonics constant movement of the plates. Question: the most powerful and destructive earthquakes occur: along divergent plate boundaries, along convergent plate boundaries (subduction zones) Magma is injected into crack (boundary between two plates), plates are forced apart, cools and becomes new crust. Spreading rate, 1 15 cm per year. Example: atlantic ocean is a divergent margin, being torn, the two plates are separating continuously at a rate of several cm/y. Example 2: red sea, like the atlantic ocean except its younger, started to spread apart much more recently. Arabian plate, volcanism is evident as a result of rifting. Middle of red sea in submarine, hydrothermal springs, magma being erupted by volcanoes, along that specific margin of red sea.
