Discontinuities and mantle deformation in the subduction zones of South America and Indonesia
南美洲和印度尼西亚俯冲带的不连续性和地幔变形
基本信息
- 批准号:188582760
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2010
- 资助国家:德国
- 起止时间:2009-12-31 至 2016-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Subduction is an integral part of plate movement and of the dynamic processes in the Earth's interior. The deformation associated with subduction processes are not well understood, so far. Seismic anisotropy is a measurable physical expression of these dynamic processes allowing to infer mantle flow in the Earth's interior. Previous studies have often shown orientation of the fast polarization axis perpendicular to the movement of the subducting plate instead of a parallel orientation as it is expected from the alignment of mantle olivine. This led to the assumption of trench-parallel flow or mineralogical influences. Lateral changes of the anisotropy further show that simple two-dimensional models are often insufficient to explain the observations. And so, measurements at single station do not reliably image the processes in the Earth's interior. The GEOFON data archive in Potsdam may provide extensive seismological data sets recorded in the subduction zones of Indonesia and South America. The station number as well as the density of these monitoring networks significantly exceed those of previous studies and allow for high-resolution determination of the lateral shear-wave splitting and thus the anisotropy in these regions. The small station spacing allows for detection of small-scale lateral changes and may thus provide a detailed image of the complex dynamic processes. In order to model and correctly interpret the resulting observations a precise knowledge of the seismic structures, layer thicknesses and discontinuities is mandatory.During the first funding period new techniques have been developed to improve the methods of S-receiver functions and SKS-splitting analysis. The data required for the investigation have been requested and pre-processed. For the area of the central Andean subduction shear wave splitting has been investigated from SKS and additional local S-phases utilizing data from the ReFuCA project. Previous observations neither of trench-parallel orientations of the fast axes nor of the large delay times of up to 3 seconds could not be confirmed in this study. During the second application period the study will be extended and completed by other data sets (IPOC, ISSA) recorded in the central and southern Andes in order to obtain a detailed image op the complexity of the seismic anisotropy. The results will be compared to a study conducted in the area of central Java, Indonesia. The aim is to map anisotropy patterns from SKS- and local S-phases with high-resolution to image deformation processes in these subduction zones. FD waveform modeling will be used to test for the plausibility of different anisotropy models that may explain the observations. Finally, it has to be examined, why the new results do not match to the previous observations.
俯冲是板块运动和地球内部动力过程的一个组成部分。到目前为止,与俯冲过程有关的变形还没有得到很好的理解。地震各向异性是这些动态过程的可测量的物理表达,允许推断地球内部的地幔流动。以前的研究经常表明,快极化轴的方向垂直于俯冲板块的运动,而不是平行的方向,因为它是预期从地幔橄榄石的对齐。这导致了平行沟流或矿物学影响的假设。各向异性的横向变化进一步表明,简单的二维模型往往不足以解释观测结果。因此,单站的测量不能可靠地反映地球内部的过程。波茨坦的GEOFON数据档案可提供印度尼西亚和南美洲俯冲带记录的大量地震数据集。这些监测网络的站点数量和密度大大超过了以前的研究,并允许高分辨率确定的横向剪切波分裂,从而在这些地区的各向异性。小的站间距允许检测小规模的横向变化,因此可以提供复杂动态过程的详细图像。为了模拟和正确解释所得到的观测结果,必须精确了解地震结构、地层厚度和不连续性,在第一个供资期间,开发了新技术,以改进S-接收器函数和SKS-分裂分析方法。调查所需的数据已要求提供并进行了预处理。对于安第斯俯冲带中部地区,利用ReFuCA项目的数据,对SKS和其他当地S相的剪切波分裂进行了研究。以前的观察,无论是沟槽平行方向的快轴,也没有大的延迟时间长达3秒,不能在这项研究中得到证实。在第二个应用期内,将通过在安第斯山脉中部和南部记录的其他数据集(IPOC、ISSA)扩大和完成研究,以便获得关于地震各向异性复杂性的详细图像。研究结果将与在印度尼西亚爪哇中部地区进行的一项研究进行比较。其目的是映射各向异性模式从SKS和当地的S-阶段与高分辨率的图像变形过程中,这些俯冲带。FD波形建模将用于测试不同各向异性模型的可解释性。最后,必须检查为什么新的结果与以前的观察结果不匹配。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Crustal thickness beneath Central and East Java (Indonesia) inferred from P receiver functions
- DOI:10.1016/j.jseaes.2015.09.001
- 发表时间:2016
- 期刊:
- 影响因子:3
- 作者:I. Wölbern;G. Rümpker
- 通讯作者:I. Wölbern;G. Rümpker
Crustal origin of trench-parallel shear-wave fast polarizations in the Central Andes
- DOI:10.1016/j.epsl.2014.02.032
- 发表时间:2014-04
- 期刊:
- 影响因子:5.3
- 作者:I. Wölbern;U. Löbl;G. Rümpker
- 通讯作者:I. Wölbern;U. Löbl;G. Rümpker
Melt infiltration of the lower lithosphere beneath the Tanzania craton and the Albertine rift inferred from S receiver functions
- DOI:10.1029/2012gc004167
- 发表时间:2012-08
- 期刊:
- 影响因子:3.7
- 作者:I. Wölbern;G. Rümpker;K. Link;F. Sodoudi
- 通讯作者:I. Wölbern;G. Rümpker;K. Link;F. Sodoudi
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Dr. Ingo Wölbern其他文献
Dr. Ingo Wölbern的其他文献
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{{ truncateString('Dr. Ingo Wölbern', 18)}}的其他基金
Seismic investigation of the Fogo magmatic plumbing system, Cape Verde, using multi-array techniques (FoMaPS)
使用多阵列技术 (FoMaPS) 对佛得角福戈岩浆管道系统进行地震调查
- 批准号:
320572620 - 财政年份:2016
- 资助金额:
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