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A Geophysical Study of the Carcavai Fault Zone, Portugal

机译：葡萄牙卡卡瓦伊断裂带的地球物理研究

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The Algarve province is located a few hundred kilometres north of the crossing of the E–W Eurasia–Africa plate boundary in an area of diffuse seismicity and broad deformation. It is characterised by a moderate seismicity, with some important historical and instrumental earthquakes causing loss of lives and significant material damages. The area is affected not only by plate boundary earthquakes but also by moderate to large events generated by local sources. The assessment of onshore local sources is, therefore, of vital importance for an evaluation of the regional seismic hazard. This paper discusses the application of geophysical data to the study of the Carcavai fault zone, an outcropping structure more than 20 km long which is seen to deform sediments of the Plio-Quaternary age. The location of some sectors of the fault zone, as well as the vertical offsets of the structure, are still to be confirmed. In order to estimate these and to study the geometry of the fault zone at depth, geophysical data were acquired together with new geological data. Where the location of the fault was less certain, EM and seismic reflection profiles with coarse spatial sampling were carried out. After the detailed location of the fault zone, seismic reflection profiles with a more dense spatial resolution were acquired. The integrated interpretation of the geological and geophysical data confirmed the presence of a large fault zone. The total fault length is still unknown as its extension offshore is still being studied. Together with estimated values of the throw obtained, this data set has improved understanding the seismic hazard in the area by providing more refined estimates of co-seismic rupture, maximum expected earthquake and return periods.
机译：阿尔加威省位于E-W欧亚大陆-非洲板块边界交汇处以北几百公里处，地处地震活动频发和变形大的地区。它的特点是中等地震活动，伴有一些重要的历史和仪器地震，造成人员伤亡和重大财产损失。该地区不仅受到板块边界地震的影响，而且还受到当地震源产生的中到大型事件的影响。因此，对陆上本地震源的评估对于评估区域地震灾害至关重要。本文讨论了地球物理数据在Carcavai断裂带研究中的应用，Carcavai断裂带是一个长20多公里的露头构造，被认为会使上古时代的沉积物变形。断层带某些扇区的位置以及结构的垂直偏移尚待确认。为了估算这些并研究深部断层带的几何形状，我们获取了地球物理数据以及新的地质数据。在断层位置不确定的地方，进行了具有粗略空间采样的电磁和地震反射剖面。在确定了断裂带的位置之后，获得了具有更密集空间分辨率的地震反射剖面。对地质和地球物理数据的综合解释证实了大断层带的存在。总断层长度仍是未知的，因为仍在研究其在近海的延伸。连同获得的投掷估算值，该数据集通过提供更精确的同震破裂，最大预期地震和返回周期的估算值，使人们对该地区的地震危险有了更好的了解。

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