ScanArray—A Broadband Seismological Experiment in the Baltic Shield
ScanArray—A Broadband Seismological Experiment in the Baltic Shield
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DOI：
10.1785/0220210015
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发表时间：
2021-05
影响因子：
3.3
通讯作者：
H. Thybo;N. Bulut;M. Grund;A. Mauerberger;A. Makushkina;I. Artemieva;N. Balling;Ó. Gudmundsson;V. Maupin;L. Ottemøller;J. Ritter;F. Tilmann
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文献类型：
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作者：
H. Thybo;N. Bulut;M. Grund;A. Mauerberger;A. Makushkina;I. Artemieva;N. Balling;Ó. Gudmundsson;V. Maupin;L. Ottemøller;J. Ritter;F. Tilmann
ScanArray国际合作项目在2012年至2017年期间在波罗的海地盾的192个地点获得了宽带地震数据。该计划的主要目标是提供岩石圈地壳和地幔以及岩石圈下上地幔结构的地震学约束。新的信息将用于研究岩石圈和深部结构如何影响观测到的快速地形变化和该区域的地质构造演化。该计划还提供了有关当地地震活动性、震源机制和地震噪音的新信息。这些记录通常质量很高，用于各种地震学方法的分析，包括地壳和上地幔的P波和S波接收函数，地震速度的表面波和环境噪声反演，利用射线和有限频率方法对上地幔速度结构进行体波P波和S波层析成像，剪切波分裂测量，用于获得上地幔和下地幔的体各向异性。在这里，我们提供了一个简短的概述的数据采集和初步分析的新数据，连同一个例子，综合地震学的结果，由项目组沿着一个代表性的1800公里长的配置文件，在波罗的海地盾的构造省份之间的丹麦和北角。第一个模型支持细分的古元古代Svecofennian省分为三个域，其中最高的地形的斯堪的纳维亚山脉在挪威沿着大西洋沿岸已开发的南部和北方域，而地形是更柔和的中央域。
The ScanArray international collaborative program acquired broadband seismological data at 192 locations in the Baltic Shield during the period between 2012 and 2017. The main objective of the program is to provide seismological constraints on the structure of the lithospheric crust and mantle as well as the sublithospheric upper mantle. The new information will be applied to studies of how the lithospheric and deep structure affect observed fast topographic change and geological-tectonic evolution of the region. The program also provides new information on local seismicity, focal mechanisms, and seismic noise. The recordings are generally of very high quality and are used for analysis by various seismological methods, including P- and S-wave receiver functions for the crust and upper mantle, surface wave and ambient noise inversion for seismic velocity, body-wave P- and S-wave tomography for upper mantle velocity structure using ray and finite frequency methods, and shear-wave splitting measurements for obtaining bulk anisotropy of the upper and lowermost mantle. Here, we provide a short overview of the data acquisition and initial analysis of the new data, together with an example of integrated seismological results obtained by the project group along a representative ∼1800-km-long profile across most of the tectonic provinces in the Baltic Shield between Denmark and the North Cape. The first models support a subdivision of the Paleoproterozoic Svecofennian province into three domains, where the highest topography of the Scandes mountain range in Norway along the Atlantic Coast has developed solely in the southern and northern domains, whereas the topography is more subdued in the central domain.