Unexpected earthquake hazard revealed by Holocene rupture on the Kenchreai Fault (central Greece): Implications for weak sub-fault shear zones
Unexpected earthquake hazard revealed by Holocene rupture on the Kenchreai Fault (central Greece): Implications for weak sub-fault shear zones
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DOI：
10.1016/j.epsl.2018.01.014
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发表时间：
2018-03
影响因子：
5.3
通讯作者：
A. Copley;C. Grützner;A. Howell;J. Jackson;C. Penney;S. Wimpenny
中科院分区：
文献类型：
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作者：
A. Copley;C. Grützner;A. Howell;J. Jackson;C. Penney;S. Wimpenny
高分辨率高程模型、古地震槽探和第四纪测年表明，科林斯湾东部（希腊）的Kenchreai断层在全新世已经破裂。沿着与邻近的Pisia和Heraion断层（于1981年破裂），我们的研究结果表明，存在紧密间隔和平行的正断层，这些正断层同时活动，但速率不同。这样的结构使我们能够解决理解地震周期的一个主要问题，特别是什么控制着震间应变积累的分布？我们的研究结果意味着这些断层上的震间加载和随后的地震是由下伏韧性地壳中的弱剪切带控制的。此外，在该地区晚第四纪地貌或垂直海岸运动不占主导地位的断层上识别重大地震滑动，为地震危险性评估提供了重要的教训。
High-resolution elevation models, palaeoseismic trenching, and Quaternary dating demonstrate that the Kenchreai Fault in the eastern Gulf of Corinth (Greece) has ruptured in the Holocene. Along with the adjacent Pisia and Heraion Faults (which ruptured in 1981), our results indicate the presence of closely-spaced and parallel normal faults that are simultaneously active, but at different rates. Such a configuration allows us to address one of the major questions in understanding the earthquake cycle, specifically what controls the distribution of interseismic strain accumulation? Our results imply that the interseismic loading and subsequent earthquakes on these faults are governed by weak shear zones in the underlying ductile crust. In addition, the identification of significant earthquake slip on a fault that does not dominate the late Quaternary geomorphology or vertical coastal motions in the region provides an important lesson in earthquake hazard assessment.