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Dynamic rupture processes and seismi...

University of Southern California., Geological Sciences.

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Dynamic rupture processes and seismic radiation in models of earthquake faults separating similar and dissimilar solids.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Dynamic rupture processes and seismic radiation in models of earthquake faults separating similar and dissimilar solids./
作者:	Shi, Zheqiang.
面頁冊數:	159 p.
附註:	Adviser: Yehuda Ben-Zion.
Contained By:	Dissertation Abstracts International70-07B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3368649
ISBN:	9781109293968

Dynamic rupture processes and seismic radiation in models of earthquake faults separating similar and dissimilar solids.
Shi, Zheqiang.

Dynamic rupture processes and seismic radiation in models of earthquake faults separating similar and dissimilar solids. - 159 p.

Adviser: Yehuda Ben-Zion.

Thesis (Ph.D.)--University of Southern California, 2009.

This thesis examines dynamic ruptures along frictional interfaces and seismic radiation in models of earthquake faults separating similar and dissimilar solids with the goal of advancing the understanding of earthquake physics.

ISBN: 9781109293968Subjects--Topical Terms:

783786
Engineering, Mechanical.

Dynamic rupture processes and seismic radiation in models of earthquake faults separating similar and dissimilar solids.
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100 1 $a Shi, Zheqiang. $3 1035729
245 1 0 $a Dynamic rupture processes and seismic radiation in models of earthquake faults separating similar and dissimilar solids.
300 $a 159 p.
500 $a Adviser: Yehuda Ben-Zion.
500 $a Source: Dissertation Abstracts International, Volume: 70-07, Section: B, page: .
502 $a Thesis (Ph.D.)--University of Southern California, 2009.
520 $a This thesis examines dynamic ruptures along frictional interfaces and seismic radiation in models of earthquake faults separating similar and dissimilar solids with the goal of advancing the understanding of earthquake physics.
520 $a The dynamics of Mode-II rupture along an interface governed by slip-weakening friction between dissimilar solids are investigated. The results show that the wrinkle-like rupture along such interfaces evolves to unilateral propagation in the slip direction of the compliant side for a broad range of conditions, and the closer the initial shear stress is to the static friction the smaller degree of material contrast is needed for this evolution to occur. Transition of the wrinkle-like pulse to crack-like rupture occurs when the reduction of friction coefficient is sufficiently large.
520 $a Energy partition associated with various rupture modes along an interface governed by rate- and state-dependent friction between identical solids is investigated. The rupture mode changes with varying velocity dependence of friction, strength excess parameter and length of the nucleation zone. High initial shear stress and weak velocity dependence of friction favor crack-like ruptures, while the opposite conditions favor the pulse-like mode. The rupture mode can switch from a subshear single pulse to a supershear train of pulses when the width of the nucleation zone is increased. The elastic strain energy released over the same propagation distance by the different rupture modes has the order: supershear crack, subshear crack, supershear train-of-pulses and subshear single-pulse. General considerations and observations suggest that the subshear pulse and supershear crack are, respectively, the most and least common modes of earthquake ruptures.
520 $a The effect of plasticity and interface elasticity on dynamic frictional sliding along an interface induced by edge impact loading between two identical elastic-viscoplastic solids is analyzed. The material on each side is isotropically strain-hardening. The interface is characterized as having an elastic response together with an inelastic response characterized by rate- and state-dependent friction. The results show that bulk material plasticity tends to smooth out oscillations. Larger impact velocity induces more extensive plastic dissipation and larger effect on slip mode and energy partition. Also larger values of the interface shear stiffness tend to favor crack-like mode of sliding.
520 $a The last part of we examine the characteristics of seismic radiation from localized fault-opening and shear motions and the effect of having dissimilar solids across the fault on seismic radiation by employing calculations of synthetic seismograms generated at various receiver locations by shear and tensile dislocation sources. The existence of a velocity contrast across the fault produces complexities that mask somewhat the polarity and amplitude signals of body waves characteristic of the tensile dislocation. The recording and analysis of the discussed signals for regular earthquakes that are dominated by shear motion will require high-resolution receivers located very close to the fault.
590 $a School code: 0208.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Geophysics. $3 535228
650 4 $a Physics, General. $3 1018488
690 $a 0373
690 $a 0548
690 $a 0605
710 2 $a University of Southern California. $b Geological Sciences. $3 1035728
773 0 $t Dissertation Abstracts International $g 70-07B.
790 $a 0208
790 1 0 $a Becker, Thorsten W. $e committee member
790 1 0 $a Ben-Zion, Yehuda, $e advisor
790 1 0 $a Jordan, Thomas H. $e committee member
790 1 0 $a Nakano, Aiichiro $e committee member
790 1 0 $a Sammis, Charles G. $e committee member
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3368649