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The global systematics of subduction...

Boston University.

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The global systematics of subduction zones.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The global systematics of subduction zones./
作者:	Syracuse, Ellen M.
面頁冊數:	325 p.
附註:	Adviser: Geoffrey A. Abers.
Contained By:	Dissertation Abstracts International69-10B.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3334563
ISBN:	9780549874263

The global systematics of subduction zones.
Syracuse, Ellen M.

The global systematics of subduction zones. - 325 p.

Adviser: Geoffrey A. Abers.

Thesis (Ph.D.)--Boston University, 2009.

To better understand the global systematics of subduction zones, a series of studies investigates their variability taking advantage of comprehensive and accurate seismicity catalogs and advances in computing for wave propagation and geodynamic modeling. Every subduction zone with sufficient intermediate-depth earthquakes (IDE) from a global teleseismic catalog is analyzed and the top of the IDE, presumably the top of the slab, is digitized. Subduction zones are separated into a total of 52 segments 500-km-long. Parameters such as dip, age, convergence velocity, and slab depth beneath arc volcanoes (H) are compiled, resulting in a comprehensive, complete suite of subduction zone descriptions. Surprisingly, H ranges from 70-190 km globally and varies smoothly between arc segments, even though most models and textbooks assume constant H for all arcs, placing new constraints on magma generation models at arcs. To assess regional biases in earthquake location due to large-scale structure, IDEs in each arc segment are relocated in a three-dimensional global velocity model. Although the absolute position of slab surfaces shifts 0-25 km regionally, global variations in H persist.

ISBN: 9780549874263Subjects--Topical Terms:

535228
Geophysics.

The global systematics of subduction zones.
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520 $a To better understand the global systematics of subduction zones, a series of studies investigates their variability taking advantage of comprehensive and accurate seismicity catalogs and advances in computing for wave propagation and geodynamic modeling. Every subduction zone with sufficient intermediate-depth earthquakes (IDE) from a global teleseismic catalog is analyzed and the top of the IDE, presumably the top of the slab, is digitized. Subduction zones are separated into a total of 52 segments 500-km-long. Parameters such as dip, age, convergence velocity, and slab depth beneath arc volcanoes (H) are compiled, resulting in a comprehensive, complete suite of subduction zone descriptions. Surprisingly, H ranges from 70-190 km globally and varies smoothly between arc segments, even though most models and textbooks assume constant H for all arcs, placing new constraints on magma generation models at arcs. To assess regional biases in earthquake location due to large-scale structure, IDEs in each arc segment are relocated in a three-dimensional global velocity model. Although the absolute position of slab surfaces shifts 0-25 km regionally, global variations in H persist.
520 $a These variations in geometry, as well as slab age, convergence velocity, sediments, the overlying plate, and the location of the transition from localized slip and distributed flow create a large range in the thermal states of subduction zones. Two dimensional thermal kinematic-flow models using these slab geometries for each 500-km segment indicate that slab crust and sediments dehydrate before reaching beneath the arc, whereas slab mantle may still be hydrated, for all slabs and a variety of assumptions.
520 $a To test these inferences, a temporary array of seismographs was deployed in Central America, sampling the slab and sub-arc mantle. P and S arrival times were inverted for earthquake locations and high-resolution regional velocity structure. Hypocenters confirm high H here. The velocity models provide a rare image of subarc melting, as a sheet of high Vp/Vs ascending from the slab to the arc, hypothesized to be a melt-rich sheet in the mantle wedge. Slow velocities in the subducted mantle also indicate a 20+ km thick layer of serpentinized upper mantle, transporting voluminous water into the subduction zone.
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