Characterisation of Seismicity of the Azores Archipelago: An Overview of Historical Events and a Detailed Analysis for the Period 2000–2012

Characterisation of Seismicity of the Azores Archipelago: An Overview of Historical Events and a Detailed Analysis for the Period 2000–2012
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亚速尔群岛地震活动特征:2000 年至 2012 年历史事件概述和详细分析

DOI:
10.1007/978-3-642-32226-6_8
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Lüdmann
Lüdmann
中科院分区:
--
文献类型:
--
作者:
Hübscher;Lüdmann

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亚速尔群岛位于大西洋中脊,在欧亚板块、努比亚(非洲)板块和美洲板块的接触形成的三重交汇处(另见Vogt和Jung,“亚速尔大地综合体和板块构造:研究历史、综合和未解之谜”一章)。地震活跃率很高,震级较低的地震,很好地界定了接触区。本章概述了现有的历史和仪器目录,基本上描述了该区域自1915年初以来的地震活动,并更详细地分析了2000-2012年期间记录的数据的特点。在包含群岛排列的观测地震活动条带内,研究了这一时期最小完备度(Mc)和b值的空间变化。考虑到格洛里亚断裂向东与中大西洋地区向西之间的地质转换,对Mc和b值进行了初步解释。
The Azores Archipelago is located in the Middle Atlantic Ridge, at the Triple Junction formed by the contact of the Euro-Asiatic, the Nubia (African) and the American plates (see also Vogt and Jung, Chapter “ The “Azores Geosyndrome” and Plate Tectonics: Research History, Synthesis, and Unsolved Puzzles ”). Its seismicity rate is very high with earthquakes with relatively low magnitude, defining quite well the contact regions. This chapter gives an overview of the existing historical and instrumental catalogues, describes the seismicity of the region essentially since early 1915, and analyses in more detail the characteristics of the recorded data in the period 2000–2012. The spatial variations of the minimum magnitude of completeness (Mc) as well as the b-value is studied for this period within the stripe of observed seismicity which contains the alignment of the Archipelago islands. A preliminary interpretation of the Mc and b-values is made keeping in mind the geological transition between the Gloria fault to the East and the Mid-Atlantic Region to the West.
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