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Complex rupture processes of the Solomon Islands subduction zone earthquake and subduction controlled upper mantle structure beneath Anatolia.

机译：所罗门群岛俯冲带地震和俯冲控制的安纳托利亚下地幔结构的复杂破裂过程。

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摘要

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.
机译：本文以俯冲带地震的形式在短时间尺度上，以俯冲带回旋或俯冲岩石圈脱离的形式在较大的时间和地理范围内探索与俯冲带有关的变形。这里介绍的研究由两部分组成。首先，我们使用体波反演技术分析了2007年4月1日所罗门群岛地震（Mw = 8.1）的震源破裂过程。我们的分析表明，地震在两个子事件中使东南太平洋俯冲带大约240 km破裂。在本研究的第二部分，我们使用剪切波分裂分析研究了俯冲非洲岩石圈对高空俯冲带的影响。东地中海地区安纳托利亚板块下面的地幔流场。我们的剪切波分裂结果与流向积极向西南撤退的爱琴海平板的西南方向相对均匀的流一致。根据观察到的延迟时间的空间变化，我们确定了安纳托利亚下方的流速变化，并且将这种变化归因于爱琴海和赛普拉斯海沟的不同后退率。最后，我们使用远震P波行进时间层析成像来成像在安纳托利亚地区下方的俯冲非洲岩石圈。我们的断层图显示，俯冲的非洲岩石圈至少沿着赛普拉斯海峡和爱琴海海沟分为两个部分。我们观察到了两段之间的缝隙，热流软流圈通过这些缝隙上升到安纳托利亚西部的火山区下方。我们的结果表明，Cyprean平板比Aegean平板更陡。我们推断，这种陡峭的几何形状部分地控制了安纳托利亚下的软流圈的流动状态，从而导致了由剪切波分裂分析推断出的流速变化。

著录项

  • 作者

    Biryol, Cemal Berk.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Geology.Plate Tectonics.Geophysics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 150 p.
  • 总页数 150
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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