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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Surface displacement field at Terceira island deduced from repeated GPS measurements
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Surface displacement field at Terceira island deduced from repeated GPS measurements

机译：重复GPS测量得出的Terceira岛表面位移场

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摘要

We present the results of six GPS (Global Positioning System) campaigns held in Terceira Island (Azores) between 1999 and 2006 for a group of 17 stations, to estimate the surface displacement field induced by the Eurasian-Nubian interplate motion, and their relationship with the rifting along Terceira Rift and volcanic processes at the island scale. We show that the whole island mainly behaves like a rigid body which absolute motion is closer to Eurasia. The magnitude of the computed intra-island horizontal deformation field (difference between the individual site velocities and the mean rigid-body motion) is still below the observation accuracy, and so cannot be directly related with local processes. We also show that the island is globally subsiding with an average rate close to 1 mm/yr, as it moves to the NE away from the Terceira Rift, mostly attached to the Eurasian plate. The high subsidence rate can be the result of the volcanic processes that shaped the Serreta ridge, NW of Terceira.
机译：我们介绍了1999年至2006年在Terceira岛（亚速尔群岛）针对17个站进行的六次GPS（全球定位系统）运动的结果，以估算由欧亚-努比亚板块间运动引起的地表位移场及其与沿Terceira裂谷的裂谷和岛屿规模的火山爆发。我们表明，整个岛主要表现为刚体，其绝对运动更接近欧亚大陆。计算出的岛内水平形变场的大小（单个部位速度与平均刚体运动之差）仍低于观测精度，因此不能与局部过程直接相关。我们还显示，随着该岛从Terceira Rift移到东北（主要附着于欧亚板块）向东北方向移动，该岛正在以平均速率接近1毫米/年的速度在全球沉降。高沉降速率可能是形成Terceira西北Serreta脊的火山过程的结果。

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