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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Temporal stability of deformation rates: Comparison of geological and geodetic observations, Hikurangi subduction margin, New Zealand
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Temporal stability of deformation rates: Comparison of geological and geodetic observations, Hikurangi subduction margin, New Zealand

机译：变形率的时间稳定性：地质与大地观测结果的比较，Hikurangi俯冲带，新西兰

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摘要

We examine how well contemporary horizontal velocity fields from Global Positioning System (GPS) geodetic measurements describe long-term deformation rates. Million-year rates of extension, shortening, strike slip and vertical-axis rotations are compared with modelling of GPS velocities from the last 10-15 years in the Hikurangi subduction margin, New Zealand. Within measurement uncertainties of mainly <= 50%, the rates of deformation and vertical-axis rotations for each time interval are usually indistinguishable. The comparable deformation rates are consistent with the notion of near-constant rates since similar to 1.5 Ma. During this time oblique relative plate motion was partitioned, with the majority (85%) of margin-normal motion accommodated on the plate interface, and most (>= 60%) margin-parallel motion by strike-slip faulting and vertical-axis rotations in the upper plate. Prior to similar to 1.5 Ma GPS velocities cannot be reliably used to describe deformation and rotations of the Hikurangi margin because, at this time, the Taupo Rift commenced opening, the boundary between Raukumara and Wairoa rotational domains was abandoned and the rates of upper-plate shortening increased. The broad compatibility of GPS and geological deformation and rotation rates since similar to 1.5 Ma suggests that the build up of contemporary elastic strains in the North Island, measured by GPS, is largely uniform for much of the duration of each seismic cycle. The good agreement between the GPS and geological deformation rates in the North Island is consistent with the view that contemporary elastic strains will mainly be converted to permanent dip slip on the subduction thrust and to displacement on upper plate faults during future large-magnitude earthquakes. (c) 2007 Elsevier B.V. All rights reserved.
机译：我们检查了来自全球定位系统（GPS）大地测量的当代水平速度场如何很好地描述了长期变形率。将过去10到15年间在新西兰Hikurangi俯冲带的GPS速度模型与百万年延伸，缩短，走滑和垂直轴旋转速率进行了比较。在主要<= 50％的测量不确定度内，每个时间间隔的变形率和垂直轴旋转率通常是无法区分的。可比较的变形速率与近似恒定速率的概念一致，因为近似于1.5 Ma。在此期间，倾斜的相对板块运动被划分，大部分（85％）的边缘法线运动被容纳在板块界面上，并且大多数（> = 60％）的边缘平行运动通过走滑断层和垂直轴旋转在上板上。在接近1.5 Ma之前，GPS速度不能可靠地用来描述Hikurangi边缘的变形和旋转，因为此时Taupo裂谷开始开放，Raukumara和Wairoa旋转域之间的边界被放弃，上板速度缩短增加。由于与1.5 Ma相似，GPS与地质变形和旋转速率的广泛兼容性表明，通过GPS测量的北岛现代弹性应变的积累在每个地震周期的大部分时间内都基本一致。 GPS与北岛的地质变形率之间的良好一致性符合以下观点，即在未来的大地震中，当代弹性应变将主要转换为俯冲推力上的永久性倾滑和上板断裂的位移。 （c）2007 Elsevier B.V.保留所有权利。

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