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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 >Strain accumulation across the Gazikoy-Saros segment of the North Anatolian Fault inferred from Persistent Scatterer Interferometry and GPS measurements
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Strain accumulation across the Gazikoy-Saros segment of the North Anatolian Fault inferred from Persistent Scatterer Interferometry and GPS measurements

机译：根据持久散射散射干涉法和GPS测量推断北安那托利亚断层Gazikoy-Saros段的应变累积

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摘要

We use a combination of Persistent Scatterer Interferometry (PSI) and GPS observations to study interseismic crustal deformation on the Gazikoy-Saros segment (Ganos fault) of the North Anatolian Fault (NAF) zone, northwestern Turkey. The data include 44 C-band radar images collected by the ERS1 and ERS2 satellites in descending orbits between 1992 and 2003 over the study area, and campaign GPS horizontal velocities from 7 stations. The resultant secular velocity field is inverted using a nonlinear minimization algorithm to estimate parameters of two interseismic deformation models: aseismic deep slip in a purely elastic earth model (elastic half-space theology), and viscoelastic flow in an elastic-viscoelastic earth model (viscoelastic-coupling theology). The following conclusions are drawn: (1) The fault locking depth is estimated in the range of similar to 8-17 km (95% confidence interval) regardless of the theological model. (2) The elastic half space model implies an upper bound of 20-27 mm/yr for the slip rate on the Ganos fault. (3) Models incorporating viscoelastic rheology and seismic cycle effects suggest a lower slip rate of 18-24 mm/yr, which agrees more closely with geological estimates. However, these values are slightly sensitive to the assumed earthquake recurrence interval. (4) A bootstrap analysis of deformation data yields average crust-upper mantle viscosities of 1.3 x 10(19)-3.6 x 10(20) Pa s for the Ganos area. (c) 2007 Elsevier B.V. All rights reserved.
机译：我们使用持续散射干涉测量（PSI）和GPS观测的组合来研究土耳其西北部北安纳托利亚断层（NAF）区域的Gazikoy-Saros段（Ganos断层）间的地壳形变。数据包括ERS1和ERS2卫星在1992年至2003年之间沿研究区域下降轨道收集的44个C波段雷达图像，以及来自7个台站的GPS行进速度。使用非线性最小化算法对合成的长期速度场进行反演，以估算两个地震变形模型的参数：纯弹性地球模型（弹性半空间神学）中的抗震深滑和弹性-粘弹性地球模型（粘弹性）中的粘弹性流。 -耦合神学）。得出以下结论：（1）不论神学模型如何，估计的断层锁定深度都在类似于8-17 km（95％置信区间）的范围内。 （2）弹性半空间模型暗示了Ganos断层上的滑动速率的上限为20-27 mm / yr。 （3）包含粘弹性流变学和地震循环效应的模型表明，滑移率较低，为18-24 mm / yr，这与地质估算结果更为吻合。但是，这些值对假定的地震复发间隔略有敏感。 （4）变形数据的自举分析得出，加诺斯地区的地壳上地幔平均粘度为1.3 x 10（19）-3.6 x 10（20）Pa s。 （c）2007 Elsevier B.V.保留所有权利。

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