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首页> 外文OA文献 >Holocene displacement field at an emerged oceanic transform-ridge junction:the Husavik-Flatey Fault – Gudfinnugja Fault system, North Iceland
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Holocene displacement field at an emerged oceanic transform-ridge junction:the Husavik-Flatey Fault – Gudfinnugja Fault system, North Iceland

机译：在出现的海洋变形 - 山脊交界处的全新世位移场：Husavik-Flatey断层 - Gudfinnugja断层系统，冰岛北部

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摘要

Our research focuses on Holocene tectonics in a broad area surrounding the junction between the active NW–SE trending Husavik-Flatey transform fault (HFF) and the N–S Gudfinnugja normal fault (GF), an exceptional example of onshore transform-ridge intersection. We mapped 637 minor and major faults, and measured the dip-slip and strike-slip offset components on the major faults. We also mapped 1016 individual tension fractures, as well as opening directions on the most reliable ones. The results indicate that this portion of the HFF comprises major right-stepping segments, with both normal and right-lateral strike-slip components, linked by local normal faults. The entire GF always shows pure dip-slip normal displacements, with a strong decrease in offset at the junction with the HFF. Fissure opening directions are in the range N45°-65°E along the HFF, N90°E along the GF, and N110°E within the area south of the HFF and west of the GF. Fault kinematics and fissure openings suggest a displacement field in good agreement with most of present-day GPS measurements, although our data indicate the possible long-term Holocene effects of the superimposition of magma-related stresses on the regional tectonic stresses. The HFF and the GF work together as a structural system able to accommodate differential crustal block motion, and possibly past dyke intrusions.
机译：我们的研究集中在活跃的西北—东南趋势胡萨维克－弗拉特变形断层（HFF）和南北古德芬努贾正断层（GF）之间交界处的全新世构造，这是陆上转换-脊相交的一个特例。我们绘制了637个次要和主要断层图，并测量了主要断层上的倾滑和走滑偏移分量。我们还绘制了1016个单独的拉伸裂缝，以及最可靠的裂缝的张开方向。结果表明，HFF的这一部分包括主要的右阶阶跃段，其正，右走向走滑分量均由局部正断层链接。整个GF总是显示纯的滑移法向位移，与HFF的连接处的偏移大大降低。沿HFF的裂隙打开方向在N45°-65°E范围内，沿GF的裂隙打开方向在N90°E范围内，在HFF的南部和GF的西部范围内为N110°E。断层运动学和裂隙开口表明位移场与当今的大多数GPS测量结果吻合得很好，尽管我们的数据表明岩浆相关应力叠加对区域构造应力可能产生长期的全新世效应。 HFF和GF作为一个结构系统一起工作，能够适应不同的地壳运动，并可能适应过去的堤防入侵。

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