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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >The nature of the plate interface and driving force of interseismic deformation in the New Zealand plate-boundary zone, revealed by the continuous GPS velocity field
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The nature of the plate interface and driving force of interseismic deformation in the New Zealand plate-boundary zone, revealed by the continuous GPS velocity field

机译：GPS连续速度场揭示的板块界面性质和新西兰板块边界带间震变形的驱动力

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摘要

New Zealand straddles the boundary between the Australian and Pacific plates. Cenozoic relative plate motion has resulted in a complex pattern of faulting and block rotation, with displacements on individual faults up to hundreds of kilometers. However, over periods of several years, GPS measurements show a remarkably smooth pattern of velocities. We show here using a new method of back slip analysis, that almost the entire plate-boundary continuous GPS velocity field can be predicted within measurement error from a simple model of elastic distortion due to deep slip on a single plate interface (megathrust in the Hikurangi and Putsegur subduction zones or fault through continental lithosphere beneath the Southern Alps) at the relative plate motion rates. This suggests that the main driving force of plate-boundary deformation is slip on the deeper moving part of the plate interface, without buried creep in localized shear zones beneath individual surface faults. The depth at which this deep slip terminates (locking point line) determines the width of deformation. Along the Hikurangi margin, there is also clockwise rotation of ~150 km long segment of the fore arc (Wairoa domain) at 4.5° ± 1 Ma, relative to the Australian Plate, about a pole in western North Island; model residuals in the velocity field are mainly a result of incomplete averaging of the cycle of slow slip events on the plate interface, downdip of the locking point. Key Points Interseismic velocity field in New Zealand driven by dip slip on plate interface Slow slip earthquakes modeled as an apparent partial coupling factor Individual faults appear to play no role in interseismic velocity field
机译：新西兰横跨澳大利亚和太平洋板块之间的边界。新生代的相对板块运动导致了断层和块体旋转的复杂模式，单个断层的位移长达数百公里。但是，在过去的几年中，GPS测量显示出非常平滑的速度模式。我们在这里显示出一种使用后滑动分析的新方法，可以通过简单的弹性变形模型（由于单个板块界面上的深滑动（Hikurangi中的超大推力））在测量误差范围内预测几乎整个板块边界连续GPS速度场。以及相对于板块运动速率穿过南阿尔卑斯山以下大陆岩石圈的断层俯冲带​​或断层）。这表明，板块边界变形的主要驱动力是在板块界面的较深运动部分上滑动，而没有在单个表面断层下方的局部剪切区内埋藏蠕变。该深滑终止的深度（锁定点线）确定变形的宽度。沿着希库朗吉边缘，相对于澳大利亚板块，前弧（威鲁阿域）的前弧长段（Wairoa域）在大约150 km处沿顺时针方向旋转，围绕北岛西部的一个极点;速度场中的模型残差主要是由于板界面上的慢滑事件周期的不完全平均，锁定点的下倾造成的。关键点由板块界面上的倾滑引起的新西兰间震速度场慢滑地震被模拟为表观局部耦合因子个别断层似乎在间震速度场中不起作用

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