The North Anatolian Fault Zone (NAFZ) is an intersection area between the Anatolian and Eurasian plates. The Arabian Plate, which squeezes the Anatolian Plate from the south between the Eurasian Plate and itself, is also responsible for this formation. This tectonic motion causes the Anatolian Plate to move westwards with almost a 20 mm yr⁻¹ velocity, which has caused destructive earthquakes in history. Block boundaries that form the faults are generally locked to the bottom of the seismogenic layer because of the friction between blocks and are responsible for these discharges. However, there are also some unique events observed around the world, which may cause partially or fully free-slipping faults. This phenomenon is called “aseismic creep” and may occur through the entire seismogenic zone or at least to some depths. Additionally, it is a rare event in the world located in two reported segments along the North Anatolian Fault (NAF), which are İsmetpaşa and Destek. In this study, we established GPS networks covering those segments and made three campaigns between 2014 and 2016. Considering the long-term geodetic movements of the blocks (Anatolian and Eurasian plates), surface velocities and fault parameters are calculated. The results of the model indicate that aseismic creep still continues with rates of 13.2±3.3 mm yr⁻¹ at İsmetpaşa and 9.6±3.1 mm yr⁻¹ at Destek. Additionally, aseismic creep behavior is limited to some depths and decays linearly to the bottom of the seismogenic layer at both segments. This study suggests that this aseismic creep behavior will not prevent medium- to large-scale earthquakes in the long term.

中文翻译：

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使用大型GPS网络监控整个北安那托利亚断层（NAF）的İsmetpaşa和Destek段的地震蠕变趋势

北安那托利亚断层带（NAFZ）是安那托利亚板块与欧亚板块之间的交集区域。阿拉伯板块也是造成这种形成的原因，该板块从南欧亚板块及其自身之间挤压安那托利亚板块。这种构造运动导致安那托利亚板块向西移动，其yr ^-1几乎为20 mm速度，造成了历史上的破坏性地震。由于断块之间的摩擦，形成断层的断块边界通常被锁定在地震层的底部，并负责这些排放。但是，在世界范围内也观察到一些独特的事件，它们可能会导致部分或全部自由滑动的断层。这种现象称为“地震蠕变”，可能会在整个地震发生带或至少某些深度发生。此外，这是世界罕见的事件，分布在北安纳托利亚断层（NAF）的两个已报告区段中，即伊斯梅帕萨（Ismetpaşa）和德斯特克（Destek）。在这项研究中，我们建立了涵盖这些细分市场的GPS网络，并在2014年至2016年之间进行了3次攻势。考虑到区块（Anatolian和Eurasian板块）的长期大地运动，计算表面速度和断层参数。模型的结果表明，抗震蠕变仍以13.2±3.3 毫米年^-1在İsmetpaşa和9.6±3.1 毫米年^-1在Destek。此外，抗震蠕变行为仅限于某些深度，并且在两个段处都线性衰减至成地震层的底部。这项研究表明，从长远来看，这种抗震蠕变行为不会阻止中到大型地震。