earthquakes 11

earthquakes 11 - Earthquakes 11 October 13, 2007 I....

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Earthquakes 11 October 13, 2007 I. Structure a. Polymorphic phase transition; i. Crystal in rocks change—like carbon to diamond 1. happens around 400 km in. 2. cause of earth’s deepest earthquakes a. olivine turns into spinel under pressure 3. at 700 km a. spinel then turns into parovskite; increase density of rocks i. slab pull; the denser material of the subducted slab drags it down (strong) ii. ridge push (weak)—from spreading ridges iii. convection—basal tractions; thought to be subordinate to slab pull 1. see FIGure A II. core a. see figure B i. iron, nickel, sulfur ii. outer core molten; we know cuz shear mod is zero; it doesn’t go thru it 1. motion of their magnetic particle – magnetic field; 2. fig. C a. inner core is solid b. velocity of seismic waves i. used to ID material ii. xenoliths—magma incorporated into surface containing deep rocks iii. kimberlite—pipes; gas charged eruptions; erupt material up from 100- 200km depth 1. how diamond get to surface 2. ophiolites
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earthquakes 11 - Earthquakes 11 October 13, 2007 I....

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