COMPLEX RUPTURE PROCESSES OF THE SOLOMON ISLANDS SUBDUCTION ZONE EARTHQUAKE AND SUBDUCTION CONTROLLED UPPER MANTLE STRUCTURE BENEATH ANATOLIA

Persistent Link:
http://hdl.handle.net/10150/194681
Title:
COMPLEX RUPTURE PROCESSES OF THE SOLOMON ISLANDS SUBDUCTION ZONE EARTHQUAKE AND SUBDUCTION CONTROLLED UPPER MANTLE STRUCTURE BENEATH ANATOLIA
Author:
Biryol, Cemal Berk
Issue Date:
2009
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
This dissertation explores subduction zone-related deformation both on short time scales in the form of subduction zone earthquakes and over larger time and geographical scales in the form of subduction rollback or detachment of the subducting lithosphere. The study presented here is composed of two parts. First, we analyzed the source-rupture processes of the April 1, 2007 Solomon Islands Earthquake (Mw=8.1) using a body-wave inversion technique. Our analysis indicated that the earthquake ruptured approximately 240 km of the southeast Pacific subduction zone in two sub-events.In the second part of this study, we used shear-wave splitting analysis to investigate the effects of the subducting African lithosphere on the upper-mantle flow field beneath the Anatolian Plate in the Eastern Mediterranean region. Our shear-wave splitting results are consistent with relatively uniform southwest-directed flow towards the actively southwestward-retreating Aegean slab. Based on spatial variations in observed delay times we identified varying flow speeds beneath Anatolia and we attribute this variation to the differential retreat rates of the Aegean and the Cyprean trenches.Finally, we used teleseismic P-wave travel-time tomography to image the geometry of the subducting African lithosphere beneath the Anatolia region. Our tomograms show that the subducting African lithosphere is partitioned into at least two segments along the Cyprean and the Aegean trenches. We observed a gap between the two segments through which hot asthenosphere ascends beneath the volcanic fields of western Anatolia. Our results show that the Cyprean slab is steeper than the Aegean slab. We inferred that this steep geometry, in part, controls the flow regime of asthenosphere beneath Anatolia causing variations in flow speeds inferred from shear-wave splitting analysis.
Type:
text; Electronic Dissertation
Keywords:
Earthquakes; Plate Boundary; Seismic Anisotropy; Seismic Tomography; Seismology; Subduction
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Geosciences; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Beck, Susan L.

Full metadata record

DC FieldValue Language
dc.language.isoENen_US
dc.titleCOMPLEX RUPTURE PROCESSES OF THE SOLOMON ISLANDS SUBDUCTION ZONE EARTHQUAKE AND SUBDUCTION CONTROLLED UPPER MANTLE STRUCTURE BENEATH ANATOLIAen_US
dc.creatorBiryol, Cemal Berken_US
dc.contributor.authorBiryol, Cemal Berken_US
dc.date.issued2009en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThis dissertation explores subduction zone-related deformation both on short time scales in the form of subduction zone earthquakes and over larger time and geographical scales in the form of subduction rollback or detachment of the subducting lithosphere. The study presented here is composed of two parts. First, we analyzed the source-rupture processes of the April 1, 2007 Solomon Islands Earthquake (Mw=8.1) using a body-wave inversion technique. Our analysis indicated that the earthquake ruptured approximately 240 km of the southeast Pacific subduction zone in two sub-events.In the second part of this study, we used shear-wave splitting analysis to investigate the effects of the subducting African lithosphere on the upper-mantle flow field beneath the Anatolian Plate in the Eastern Mediterranean region. Our shear-wave splitting results are consistent with relatively uniform southwest-directed flow towards the actively southwestward-retreating Aegean slab. Based on spatial variations in observed delay times we identified varying flow speeds beneath Anatolia and we attribute this variation to the differential retreat rates of the Aegean and the Cyprean trenches.Finally, we used teleseismic P-wave travel-time tomography to image the geometry of the subducting African lithosphere beneath the Anatolia region. Our tomograms show that the subducting African lithosphere is partitioned into at least two segments along the Cyprean and the Aegean trenches. We observed a gap between the two segments through which hot asthenosphere ascends beneath the volcanic fields of western Anatolia. Our results show that the Cyprean slab is steeper than the Aegean slab. We inferred that this steep geometry, in part, controls the flow regime of asthenosphere beneath Anatolia causing variations in flow speeds inferred from shear-wave splitting analysis.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectEarthquakesen_US
dc.subjectPlate Boundaryen_US
dc.subjectSeismic Anisotropyen_US
dc.subjectSeismic Tomographyen_US
dc.subjectSeismologyen_US
dc.subjectSubductionen_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGeosciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairBeck, Susan L.en_US
dc.contributor.committeememberZandt, Georgeen_US
dc.contributor.committeememberJohnson, Roy A.en_US
dc.contributor.committeememberBennett, Richard A.en_US
dc.contributor.committeememberKapp, Paulen_US
dc.identifier.proquest10738en_US
dc.identifier.oclc659753556en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.