Active shortening and aseismic slip along the Cephalonia Plate Boundary (Paliki Peninsula, Greece): Evidence from InSAR and GNSS data

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Tectonophysics Pub Date : 2024-06-27 DOI:10.1016/j.tecto.2024.230400
Varvara Tsironi , Athanassios Ganas , Sotirios Valkaniotis , Vasiliki Kouskouna , Efthimios Sokos , Ioannis Koukouvelas
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Abstract

We present a comprehensive analysis of geodetic data, including InSAR and GNSS, to assess the interseismic deformation of the Paliki peninsula in western Cephalonia, Greece. The region is prone to frequent earthquakes, due to its proximity to the Cephalonia Transform Fault (CTF), a 140 km long dextral strike-slip fault (striking NNE-SSW) that accommodates the relative motion between the Apulian and Aegean lithospheric plates. Our analysis covers the period from 2016 to 2022 and leverages LiCSBAS, an open-source package, for InSAR time series analysis with the N-SBAS method. The results of the InSAR analysis demonstrate deformation rates between 2 and 5 mm/yr in the line-of-sight (LOS) direction of the satellite. We constructed E-W velocity profiles that provided a velocity gradient terminating against the outcropping trace of the seismic fault of the 3 February 2014 earthquake (M6.1) near Atheras. This geodetic evidence indicates a ∼ 1 mm/yr minimum aseismic slip (fault creep) motion along the February 2014 seismic fault, during 2016–2022. Positive LOS values in both satellite imaging geometries show that the coastal town of Lixouri experiences uplift of 1 mm/yr. East-West velocity cross-sections across western Cephalonia including Gulf of Argostoli reveal several velocity discontinuities, possibly bounded by active faults and/or landslides. The E-W shortening rate between Lixouri and Argostoli areas amounts to 1.5 mm/yr corresponding to −187 ns/yr (nanostrain/yr) of tectonic strain. Our results suggest a complex deformation pattern on the Paliki peninsula with strain accumulation along strike-slip and reverse-slip faults. We also inverted GNSS velocities from Italy and Greece, across the Cephalonia segment of CTF (assuming elastic half-space) and obtained a locking depth of 13 km, and a slip rate of 17.3 ± 0.8 mm/yr.

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沿塞法罗尼亚板块边界(希腊帕利基半岛)的活动性缩短和地震滑移:来自 InSAR 和 GNSS 数据的证据
我们对包括 InSAR 和 GNSS 在内的大地测量数据进行了全面分析,以评估希腊西塞法罗尼亚帕利基半岛的地震间变形。该地区地震频发,原因是靠近塞法罗尼亚断层(Cephalonia Transform Fault,CTF),CTF 是一条 140 公里长的右旋走向滑动断层(走向 NNE-SSW),容纳了阿普利亚板块和爱琴海岩石圈板块之间的相对运动。我们的分析涵盖 2016 年至 2022 年,利用开源软件包 LiCSBAS,采用 N-SBAS 方法对 InSAR 时间序列进行分析。InSAR 分析结果表明,卫星视线(LOS)方向的形变速率为 2 至 5 毫米/年。我们构建的东西向速度剖面图提供了一个速度梯度,其终点与 2014 年 2 月 3 日阿瑟拉斯附近地震(M6.1 级)断层的出露痕迹相对应。这一大地测量证据表明,在 2016-2022 年期间,沿 2014 年 2 月地震断层的最小地震滑移(断层蠕变)运动为 1 毫米/年。两个卫星成像几何图形中的正 LOS 值显示,沿海城镇利休里的隆起幅度为 1 毫米/年。横跨包括阿尔戈斯托利湾在内的西塞法罗尼亚的东西向速度横断面显示出几个速度不连续点,可能以活动断层和/或滑坡为界。利苏里和阿尔戈斯托利地区之间的东西向缩短速率为 1.5 毫米/年,相当于-187 纳秒/年(纳应变/年)的构造应变。我们的研究结果表明,帕利基半岛的变形模式十分复杂,应变沿走向滑动断层和逆向滑动断层累积。我们还反演了意大利和希腊的 GNSS 速度,横跨 CTF 的 Cephalonia 段(假设为弹性半空间),得出锁定深度为 13 千米,滑动速率为 17.3 ± 0.8 毫米/年。
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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