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Distribution, origin and implication...

Chen, Po-Fei.

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Distribution, origin and implications of seismic stress release in shallow and intermediate-depth subduction systems.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Distribution, origin and implications of seismic stress release in shallow and intermediate-depth subduction systems./
Author:	Chen, Po-Fei.
Description:	149 p.
Notes:	Adviser: Emile A. Okal.
Contained By:	Dissertation Abstracts International63-11B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3071622
ISBN:	0493915249

Distribution, origin and implications of seismic stress release in shallow and intermediate-depth subduction systems.
Chen, Po-Fei.

Distribution, origin and implications of seismic stress release in shallow and intermediate-depth subduction systems. - 149 p.

Adviser: Emile A. Okal.

Thesis (Ph.D.)--Northwestern University, 2002.

A characterization of focal mechanisms is developed for shallow and intermediate-depth earthquakes in the context of the local geometry of subduction systems. Its application to the Ryukyu-Taiwan-Luzon system is used to refine the spatial distribution of characteristic groups of earthquakes in the framework of local tectonic processes, such as flipping of the polarity of subduction and the nascent processes of arc-continent collision.

ISBN: 0493915249Subjects--Topical Terms:

535228
Geophysics.

Distribution, origin and implications of seismic stress release in shallow and intermediate-depth subduction systems.
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020 $a 0493915249
035 $a (UnM)AAI3071622
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040 $a UnM $c UnM
100 1 $a Chen, Po-Fei. $3 1250507
245 1 0 $a Distribution, origin and implications of seismic stress release in shallow and intermediate-depth subduction systems.
300 $a 149 p.
500 $a Adviser: Emile A. Okal.
500 $a Source: Dissertation Abstracts International, Volume: 63-11, Section: B, page: 5126.
502 $a Thesis (Ph.D.)--Northwestern University, 2002.
520 $a A characterization of focal mechanisms is developed for shallow and intermediate-depth earthquakes in the context of the local geometry of subduction systems. Its application to the Ryukyu-Taiwan-Luzon system is used to refine the spatial distribution of characteristic groups of earthquakes in the framework of local tectonic processes, such as flipping of the polarity of subduction and the nascent processes of arc-continent collision.
520 $a The Harvard catalogue of Centroid Moment Tensor solutions is expanded to include intermediate-depth earthquakes from the WWSSN-HGLP era (1962–1975). Seventy-six new solutions are obtained, with the resulting dataset estimated to be complete for <italic>M</italic><sub>0</sub> ≥ 10<super>26</super> dyn-cm. While source mechanisms from our new dataset are generally similar to those previously compiled in the Harvard catalogue, seismic moment release rates are found to be significantly smaller for the WWSSN era.
520 $a The intermediate-depth seismicity of South America is compiled from the Harvard catalogue, using projection along local slab coordinates, to determine along-strike variations in the distribution of earthquakes and in the geometry of their stress release. Slab geometry is investigated in relation to slab stresses and the presence or absence of arc volcanism. Steeper-dipping slabs are found to exhibit consistent down-dip extension, a higher rate of seismic moment release and surface volcanism.
520 $a Visualization using slab coordinate projections is extended systematically to a global survey of the geometry of stress release in intermediate-depth earthquakes. Various proposed models for all subduction zones are appraised, as contributors to stress regimes, based on global data compilations. Down-dip stresses, where prominent, are found to be consistent with the thermo-mechanical and petrological force models. Slab-normal conjugate stresses generally support the concept of earthquake reactivation of fossil faults. Patterns of lateral stresses support the predictions of the so-called “punctured-ping-pong-ball” model.
590 $a School code: 0163.
650 4 $a Geophysics. $3 535228
690 $a 0373
710 2 0 $a Northwestern University. $3 1018161
773 0 $t Dissertation Abstracts International $g 63-11B.
790 $a 0163
790 1 0 $a Okal, Emile A., $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3071622