GEOL107 Lecture Notes - Lecture 17: Asthenosphere, Convergent Boundary, Mid-Ocean Ridge

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Plates moving apart at mid-ocean ridge create gap at surface. Magma from mantle rises to fill gap. Magma is cooled/ crystallizes forming new oceanic crust. Plates cool as they move away from mid ocean ridge became thicker and denser, sink , depth (and age of ocean crust) increases with distance from mid-ocean ridge new ocean crust created at mid-ocean ridge, moves. Seafloor spreading - away, gets older, colder, denser, and sinks depth increases away from mid-ocean ridge. Stresses generate earthquakes - small magnitude, shallow depth (<10 km) Stresses generate earthquakes - small magnitude, shallow (in focal depth <10. If continental pieces continue to move apart (after millions of years) seafloor. If continental pieces continue to move apart (after millions of years) seafloor km) spreading may start spreading may start. Subduction - oceanic lithosphere beneath continental lithosphere. Deep oceanic trench at subduction zone - deepest parts of the ocean (>6,000 m)

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