The quest for the source area of the 1755 Lisbon erthquake - revealing the maximum depth of seismogenic faulting in the Horseshoe abyssal plain

寻找1755年里斯本地震的震源区——揭示马蹄深渊平原孕震断层的最大深度

• 批准号: 202901856
• 负责人: Professor Dr. Ingo Grevemeyer
• 金额: --
• 依托单位: Forschungseinheit Marine Geodynamik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/202901856?language=en
• 关键词: quest; source; area; 1755; Lisbon

The Gulf of Cadiz and the Horseshoe abyssal plain are characterized by diffuse seismic and tectonic activity and the region lacks a clear plate boundary separating Africa from Eurasia/Iberia. The area hosted with the Great Lisbon earthquake of 1755 the largest European earthquake since historic earthquakes were reported. The exact location of the source of the 1755 Lisbon earthquake is still unknown. Recent work, however, suggested that the event occurred in the vicinity of the Horseshoe fault, an oblique thrust fault. The Horseshoe fault is cut by prominent features in the bathymetry – the SWIM lineaments. The SWIM lineaments are believed to facilitate fluid migration. The work proposed here has two main aims: (i) surveying the seismogenic potential of the area by yielding the maximum depth of seismogenic faulting and (ii) relating fluid seepage to seismically active faults. Therefore, as a piggy back project to the RV Meteor cruise M86/1 a small network of OBS shall be deployed in the Horseshoe abyssal plain and across the Horseshoe fault, recording earthquakes over 5-7 month.

加迪斯湾和马蹄海深海平原的特点是地震和构造活动分散，该区域缺乏将非洲与欧亚/伊比利亚分开的明确板块边界。1755年的里斯本大地震是有史以来欧洲最大的地震。1755年里斯本地震震源的确切位置至今仍不得而知。然而，最近的研究表明，该事件发生在马蹄断层附近，这是一个斜向逆冲断层。马蹄断层被水深测量中的突出特征-SWIM线性构造切割。SWIM线性构造被认为有助于流体迁移。这里提出的工作有两个主要目标：（一）通过得出发震断层的最大深度来调查该地区的发震潜力;（二）将流体渗漏与地震活动断层联系起来。因此，作为RV Meteor巡航M86/1的捎带项目，应在马蹄形深海平原和马蹄形断层上部署一个小型OBS网络，记录5-7个月的地震。

项目成果

Seismotectonics of the Horseshoe Abyssal Plain and Gorringe Bank, eastern Atlantic Ocean: Constraints from ocean bottom seismometer data

东大西洋马蹄深渊平原和戈林奇浅滩的地震构造学：来自海底地震仪数据的约束

• DOI: 10.1002/2016jb013586
• 发表时间: 2017
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Grevemeyer;D. Lange;H. Villinger;S. Custódio;L. Matias
• 通讯作者: L. Matias