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Deformation Processes in Great Subdu...

Hu, Yan.

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Deformation Processes in Great Subduction Zone Earthquake Cycles.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Deformation Processes in Great Subduction Zone Earthquake Cycles./
Author:	Hu, Yan.
Description:	212 p.
Notes:	Source: Dissertation Abstracts International, Volume: 73-01, Section: B, page: 1710.
Contained By:	Dissertation Abstracts International73-01B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR80384
ISBN:	9780494803844

Deformation Processes in Great Subduction Zone Earthquake Cycles.
Hu, Yan.

Deformation Processes in Great Subduction Zone Earthquake Cycles. - 212 p.

Source: Dissertation Abstracts International, Volume: 73-01, Section: B, page: 1710.

Thesis (Ph.D.)--University of Victoria (Canada), 2011.

This dissertation consists of two parts and investigates the crustal deformation associated with great subduction zone earthquake at two different spatial scales. At the small scale, I investigate the stress transfer along the megathrust during great earthquakes and its effects on the forearc wedge. At the large scale, I investigate the viscoelastic crustal deformation of the forearc and the back arc associated with great earthquakes.

ISBN: 9780494803844Subjects--Topical Terms:

535228
Geophysics.

Deformation Processes in Great Subduction Zone Earthquake Cycles.
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020 $a 9780494803844
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100 1 $a Hu, Yan. $3 2102292
245 1 0 $a Deformation Processes in Great Subduction Zone Earthquake Cycles.
300 $a 212 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-01, Section: B, page: 1710.
500 $a Advisers: Kelin Wang; George D. Spence.
502 $a Thesis (Ph.D.)--University of Victoria (Canada), 2011.
520 $a This dissertation consists of two parts and investigates the crustal deformation associated with great subduction zone earthquake at two different spatial scales. At the small scale, I investigate the stress transfer along the megathrust during great earthquakes and its effects on the forearc wedge. At the large scale, I investigate the viscoelastic crustal deformation of the forearc and the back arc associated with great earthquakes.
520 $a Part I: In a subduction zone, the frontal region of the forearc can be morphologically divided into the outer wedge and the inner wedge. The outer wedge which features much active plastic deformation has a surface slope angle generally larger than that of the inner wedge which hosts stable geological formations. The megathrust can be represented by a three-segment model, the updip zone (velocity-strengthening), seismogenic zone (velocity-weakening), and downdip zone (velocity-strengthening). Our dynamic Coulomb wedge theory postulates that the outer wedge overlies the updip zone, and the inner wedge overlies the seismogenic zone. During an earthquake, strengthening of the updip zone may result in compressive failure in the outer wedge. The inner wedge undergoes elastic deformation. I have examined the geometry and mechanical processes of outer wedges of twenty-three subduction zones. The surface slope of these wedges is generally too high to be explained by the classical critical taper theory but can be explained by the dynamic Coulomb wedge theory.
520 $a Part II: A giant earthquake produces coseismic seaward motion of the upper plate and induces shear stresses in the upper mantle. After the earthquake, the fault is re-locked, causing the upper plate to move slowly landward. However, parts of the fault will undergo continuous aseismic afterslip for a short duration, causing areas surrounding the rupture zone to move seaward. At the same time, the viscoelastic relaxation of the earthquake-induced stresses in the upper mantle causes prolonged seaward motion of areas farther landward including the forearc and the back arc. The postseismic and interseismic crustal deformation depends on the interplay of these three primary processes. I have used three-dimensional viscoelastic finite element models to study the contemporary crustal deformation of three margins, Sumatra, Chile, and Cascadia, that are presently at different stages of their great earthquake cycles. Model results indicate that the earthquake cycle deformation of different margins is governed by a common physical process. The afterslip of the fault must be at work immediately after the earthquake. The model of the 2004 Sumatra earthquake constrains the characteristic time of the afterslip to be 1.25 yr. With the incorporation of the transient rheology, the model well explains the near-field and far-field postseismic deformation within a few years after the 2004 Sumatra event. The steady-state viscosity of the continental upper mantle is determined to be 1019 Pa S, two orders of magnitude smaller than that of the global value obtained through global postglacial rebound models.
590 $a School code: 0244.
650 4 $a Geophysics. $3 535228
650 4 $a Geodesy. $3 550741
650 4 $a Geology. $3 516570
690 $a 0373
690 $a 0370
690 $a 0372
710 2 $a University of Victoria (Canada). $3 1019404
773 0 $t Dissertation Abstracts International $g 73-01B.
790 $a 0244
791 $a Ph.D.
792 $a 2011
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR80384