Neogene Through Quaternary Tectonic Reactivation of SW Iberian Passive Margin
Neogene Through Quaternary Tectonic Reactivation of SW Iberian Passive Margin
复制标题
新近纪通过第四纪构造重新激活西伊比利亚被动边缘
DOI：
10.1007/s00024-003-2463-4
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发表时间：
2004
影响因子：
2
通讯作者：
B. Team
中科院分区：
文献类型：
--
作者：
N. Zitellini;M. Rovere;P. Terrinha;F. Chierici;L. Matias;B. Team
葡萄牙西南部、加的斯湾和摩洛哥面临着与地震和海啸有关的自然灾害的潜在威胁。我们报告了 1992 年和 1998 年沿伊比利亚西南部大陆边缘和洋壳进行的两次多道地震 (MCS) 勘测的结果。该 MCS 数据集显示了涉及研究区域的大陆和洋壳的压缩变形的证据。变形区域从塔霍深渊平原南部边界延伸到塞纳深渊平原，涵盖了葡萄牙西南部的大陆边缘。观察到的大多数结构可能与非洲-欧洲板块汇聚的中中新世阶段有关。在本文中，我们讨论了识别仍然活跃且可能产生大地震和海啸的构造结构的最新进展。已确定的构造结构分别位于瓜达尔基维尔河岸、马蹄深渊平原东部边界和葡萄牙西南部大陆坡沿线。
Southwest Portugal, the Gulf of Cadiz and Morocco are under the potential threat of natural hazards linked to seismicity and tsunami generation. We report the results of two multi-channel seismic (MCS) surveys carried out in 1992 and 1998 along the continental margin and oceanic crust of SW Iberia. This MCS data set shows the evidence of the compressional deformation which involves both the continental and the oceanic crust of the study area. The area of deformation extends from the southern border of the Tagus Abyssal Plain to the Seine Abyssal Plain, encompassing the continental margin of SW Portugal. Most of the structures observed are probably related to a Mid-Miocene phase of Africa-Europe plate convergence. In this paper we discuss the recent advances on the identification of the tectonic structures that are still active and that may generate great earthquakes and tsunamis. The tectonic structures identified are located respectively at the Guadalquivir Bank, along the eastern border of the Horseshoe Abyssal Plain and along the southern continental slope of SW Portugal.