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Fate of Slabs.

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Presentation on theme: "Fate of Slabs."— Presentation transcript:

1 Fate of Slabs

2 Invert P waves for 3-D mantle structure
10 million travel times: ISC, NEIC, temporary arrays 0.5 million earthquakes Ray theory & 3-D sensitivity kernels Model norm and gradient regularization Li, van der Hilst, Engdahl, and Burdick, 2008; G3

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5 1-4 Cocos plate: complex structures into lower mantle
6-9 Nazca and Farallon plates subduct into lower mantle 10 South Sandwich Islands

6 Steep upper mantle slabs (Kuril, Mariana) subduct below 660
Shallow-dip(Japan, Izu-Bonin) and young slabs (Ryukyu) stagnate in transition zone

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8 Deep subduction: Central America, Indochina, segments of NW and SW Pacific
Stagnation of slab fragments ( km) N Philippine Sea plate and SE Asia, Mediterranean, parts of Tonga

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11 (Kellogg et al. 1999)

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17 South America

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