Transient Aseismic Vertical Deformation Across the Steeply-Dipping Pisia-Skinos Normal Fault (Gulf of Corinth, Greece)

IF 3.3 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Tectonics Pub Date : 2024-08-02 DOI:10.1029/2024tc008276
Zoë K. Mildon, Manuel Diercks, Gerald P. Roberts, Joanna P. Faure Walker, Athanassios Ganas, Ioannis Papanikolaou, Vassilis Sakas, Jenni Robertson, Claudia Sgambato, Sam Mitchell
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引用次数: 0

Abstract

Geodetically-derived deformation rates are sometimes used to infer seismic hazard, implicitly assuming that short-term (annual-decadal) deformation is representative of longer-term deformation. This is despite geological observations indicating that deformation/slip rates are variable over a range of timescales. Using geodetic data from 2016 to 2021, we observe an up to 7-fold increase in vertical deformation rate in mid-2019 across the Pisia-Skinos normal fault in Greece. We hypothesize that this deformation is aseismic as there is no temporally correlated increase in the earthquake activity (M > 1). We explore four possible physical mechanisms, and our preferred hypothesis is that the transient deformation is caused by centimeter-scale slip in the upper 5 km of the Pisia fault zone. This is the first observation of shallow tectonic (i.e., not related to human activities) aseismic deformation on a normal fault globally. Our results suggest that continental normal faults can exhibit variable deformation over shorter timescales than previously observed, and thus care should be taken when utilizing geodetic rates to quantify seismic hazard.
穿越陡倾皮西亚-斯基诺斯正断层的瞬态地震垂直变形(希腊科林斯湾)
从地质学角度得出的形变率有时被用来推断地震危险性,隐含地假定短期(年-十年)形变代表长期形变。尽管地质观测结果表明,形变/滑动率在一系列时间尺度上都是可变的。利用 2016 年至 2021 年的大地测量数据,我们观测到 2019 年中期希腊皮西亚-斯基诺斯正断层的垂直变形率增加了 7 倍。我们假设这种变形是非地震性的,因为地震活动(M >1)并没有在时间上相关增加。我们探讨了四种可能的物理机制,首选的假设是,瞬态形变是由皮西亚断层带上段 5 公里处厘米级的滑动引起的。这是首次在全球范围内观测到正断层的浅构造(即与人类活动无关)地震变形。我们的研究结果表明,大陆正断层在更短的时间尺度上会出现比以前观测到的更多的变形,因此在利用大地测量速率来量化地震危害时应小心谨慎。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Tectonics
Tectonics 地学-地球化学与地球物理
CiteScore
7.70
自引率
9.50%
发文量
151
审稿时长
3 months
期刊介绍: Tectonics (TECT) presents original scientific contributions that describe and explain the evolution, structure, and deformation of Earth¹s lithosphere. Contributions are welcome from any relevant area of research, including field, laboratory, petrological, geochemical, geochronological, geophysical, remote-sensing, and modeling studies. Multidisciplinary studies are particularly encouraged. Tectonics welcomes studies across the range of geologic time.
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