EOSC 314 Lecture Notes - Lecture 8: Nootka Fault, Geophysics, Cascade Range

• School: UBC
• Department: Earth and Ocean Sciences
• Course: EOSC 314
• Professor: Curtis Suttle

Document Summary

Oceanic plate collision: older/colder plate will go under younger/warmer plate, subduction zones marked by trenches, rising magma forms volcanic island arcs, locations: mainly in western pacific, deepest trenches, high volcanic and seismic activity, andesitic volcanic eruptions. Pacific ring of fire: seduction zone and transform plates, massive amount of tectonic and volcanic activity. Many trenches are arc-shaped and have cusp patterns: a pointed end where 2 curves come together. Continental continental boundaries: when two continental plates collide, no seduction occurs (densities equal); no trench. Plates move in opposite directions: active part of transform margin, major seismic activity, join two segments of mor/plates, age of sea floor varies when the ridge is offset, major faults, san andreas fault. Juan de fuca ridge: spreading center, in bc. Wilson cycle: john tuzo wilson, canadian geophysicist, proposed supercontinent cycle, aka wilson cycle", describes life cycle of ocean basins, formation, growth, destruction, stages of basin development, embryonic, juvenile, mature, declining, terminal, suturing.