EESA06H3 Lecture Notes - Lecture 5: Subduction, Stratovolcano, Supervolcano
11 Feb 2013
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Document Summary
Strato volcanoes layered nature, stratisifed, aka composite volcanoes, oversteepend side slopes collapse. Tilt meter- measures displacement of the ground, cuz volcanoe inflates, used to predict eruptions, and seismic activity. Delta large body of sediment brought by rivers, then dumped in lake. Soft, silk sediment from thousands of years and accumulates. Northern part attacarma dessert cuz subduction zone on floor, marked by very deep water (trench). Cold water upwells to the ocean surface, brings up nutrients, cools the air above which cannot contain much moisture. Purpose: to cool the coast and make it very dry. Uplifted formation of tall mountains, pacific plate subducted down, dynamic earth. Lascar volcano: chile"s most active, composite, strato volcano, no veges, like a desert. Chaiten volcano polverized rock (very fine dust) dust -> ash -> big boulders. Has viscous magma, sideflow, growing within an older caldera, large amnts ash made. Climates get cooler, ash gets washed out, shortlived climate effects.
