The Alpine Orogeny in the West and Southwest Iberia Margins

Terrinha, Pedro; Ramos, Adrià; Neres, Marta; Valadares, Vasco; Duarte, João C.; Martínez-Loriente, S.; Silva, Sónia; Mata, João; Kullberg, José Carlos; Casas‐Sainz, Antonio M.; Matias, L.; Fernández, Òscar; Muñoz, Josep Antón; Ribeiro, Carlos Eduardo Parente; Font, Eric; Neves, Conceição; Roque, Cristina; Rosas, Filipe; Pinheiro, Luís Menezes; Bartolomé, Rafael; Sallarès, Valentı́; Magalhães, Vítor; Medialdea, Teresa; Somoza, Luı́s; Gràcia, Eulália; Hensen, Christian; Gutscher, Marc‐André; Ribeiro, A.; Zitellini, Nevio

doi:10.1007/978-3-030-11295-0_11

Cited by 18 publications

(18 citation statements)

References 96 publications

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“…The Western and Southwestern Iberia are usually considered as one Stable Continental Region (SCR) onshore domain (Johnston, 1989) in the sense that the most recent active tectonic event, the Alpine orogeny that led to the formation of the Pyrenees and the Betics in Iberia, attained its activity peak in Eocene and Miocene times (e.g. Terrinha et al, 2019). In W and SW Iberia, the Alpine orogeny resulted in the inversion of meso-cenozoic basins in central Portugal (the Lusitanian basin) and…”

Section: Geodynamic Settingmentioning

confidence: 99%

A sanity check for earthquake recurrence models used in PSHA of slow deforming regions: the case of SW Iberia

Ramalho

Matias

Neres

et al. 2020

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Abstract. Probabilistic Seismic Hazard Assessment (PSHA) is the most common tool used to decide on the acceptable seismic risk and corresponding mitigation measures. We propose two consistency tests to address the variability of earthquake generation models found in PSHA studies: i) one rule-of-thumb test where the seismic moment release from the model is converted to an average slip on a typical fault and compared with known plate kinematics or GNSS deformation field; ii) using a neotectonic model, the computed deformation is converted into seismic moment release and to a synthetic earthquake catalogue. We apply these tests to the W and SW Iberia slow deforming region, where two earthquake source areas are investigated: 1) the Lower Tagus Valley, one of the largest seismic risk zones of Portugal; and 2) the offshore SW Iberia area, considered to be the source for the 1st November 1755 event (M~8.7). Results show that some of the earthquake source models should be considered as suspicious, given their high/low moment release when compared to the expected values from GNSS observations or neotectonic modelling. In conclusion, PSHA studies in slow deforming regions should include a similar sanity check on their models' evaluation, downgrading the weight of poorly compliant models.

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Section: Geodynamic Settingmentioning

confidence: 99%

A sanity check for earthquake recurrence models used in PSHA of slow deforming regions: the case of SW Iberia

Ramalho

Matias

Neres

et al. 2020

Preprint

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“…The West and SW Iberian margins evolved through a sequence of rift episodes from the Late Triassic to the Early Cretaceous during the synrift, post-rift and passive-margin phases of the North Atlantic evolution (Terrinha et al 2019b). Overlying the Paleozoic and Proterozoic basement are sedimentary Mesozoic and Cenozoic basins, bordering the Portuguese Atlantic margin, which are potential targets for CO 2 storage (Fig.…”

Section: Lithostratigraphic and Tectonic Framework Of Sedimentary Basinsmentioning

confidence: 99%

Identification and characterization of geological formations with CO ₂ storage potential in Portugal

Pereira

Ribeiro

Carneiro

2021

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Carbon capture, utilization and storage (CCUS) is considered a major part of the Portuguese strategy for reducing CO2 emissions. Some industrial sectors, the most prominent being the cement sector, require the implementation of CO2 storage to reach carbon neutrality by 2050. This article presents and characterises the areas with potential for CO2 storage in mainland Portugal. The lithostratigraphic and tectonic frameworks of the onshore and offshore basins are presented; a site screening process was conducted, based on basin- and regional-scale assessments, resulting in the definition of eight possible storage clusters, seven of which are offshore. The storage capacity was estimated for those clusters, with a central (P50) value of 7.09 Gt; however, the most interesting locations are in the Lusitanian Basin (West Iberian Margin), both onshore and offshore, as they present high capacity and are located favourably in relation to the industrial CO2 emitters. Considering only the potential sites of this basin, their storage capacities are greater than 3 Gt CO2, of which 259 Mt are onshore.Thematic collection: This article is part of the Geoscience for CO2 storage collection available at: https://www.lyellcollection.org/cc/geoscience-for-co2-storage

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“…To the north, the Galicia Bank is a main unit consisting of remnant rift structures (Montenat, et al 1998). Adjacent to the Estremadura Spur, the elongated Tore Seamountain extends westward for about 240 km (Figure 1b), formed by coalesced ridges and seamounts that surround an inner asymmetric depression that, at its maximum, is deeper than the surrounding Iberia and Tagus Abyssal Plains (Roque et al 2009;Terrinha et al 2019). This feature is the northernmost termination of the Madeira-Tore Rise, which is punctuated along its length by numerous volcanic peaks (Merle et al 2018).…”

Section: Canyons and Deep-marine Featuresmentioning

confidence: 99%

“…To the southwest, east-west trending seamount chains border the abyssal plains, namely the Gorringe-Josephine chain separating the Tagus and Horseshoe Abyssal Plains, and the Coral Patch Ridge -Lion Seamount separating the Horseshoe and Seine Abyssal Plains (Figure 1b). The seamounts have variable genesis derived from volcanic and/or tectonic processes (Girardeau et al 1998;Gamboa et al 2021a), often associated with reactivated rift structures (Tortella et al 1997;Terrinha et al 2019). Large massfailures occurred on the seamount flanks (Lo Iacono et al 2012;Omira et al 2016;Gamboa et al 2021a), but widespread collapses have been identified at various scales (Gamboa et al 2021b).…”

Section: Canyons and Deep-marine Featuresmentioning

confidence: 99%

Spatial and morphometric relationships of submarine landslides offshore west and southwest Iberia

Gamboa¹,

Omira²,

Terrinha³

2021

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Submarine landslides are ubiquitous geohazards in marine environments occurring at multiple scales. Increasing efforts have been made to catalogue and categorise submarine landslides in comprehensive databases, aiming to better understand their preconditioning and trigger factors. Using the recently compiled, open-access MAGICLAND dataset, we investigate the distribution and morphometric trends of submarine landslides observed in seven distinct geomorphologic domains offshore west and southwest Iberia. In the study area, the higher densities of submarine landslides occur on the proximal southwest margin, with higher frequency nearby earthquake epicentre clusters recorded in the area. Submarine canyons are another major location for slope collapses, with a prevalence for their mouth regions. However, relevant numbers occur within all domains with important relief, including distal regions hundreds of kilometres away from the foot of the continental slope. Landslide size range is inversely proportional to their spacing and frequency within each domain, and within the whole study area. Relevant positive correlations were obtained between the parameters analysed, but relationships between unidimensional parameters such as length and width exhibit the lower correlation coefficient. Correlations of 2D and 3D parameters such as area and volume provide better results, aligning with prior observations. The relationships obtained are, however, variable across domains and the correlation values are influenced by the seafloor geomorphology. This work brings new insights on submarine landslide distribution in the understudied west and southwest Iberian continental margin, complements previous inventories made for nearby regions, and provides valuable data with wider applications for submarine landslide databases.

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The Alpine Orogeny in the West and Southwest Iberia Margins

Cited by 18 publications

References 96 publications

A sanity check for earthquake recurrence models used in PSHA of slow deforming regions: the case of SW Iberia

A sanity check for earthquake recurrence models used in PSHA of slow deforming regions: the case of SW Iberia

Identification and characterization of geological formations with CO ₂ storage potential in Portugal

Spatial and morphometric relationships of submarine landslides offshore west and southwest Iberia

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The Alpine Orogeny in the West and Southwest Iberia Margins

Cited by 18 publications

References 96 publications

A sanity check for earthquake recurrence models used in PSHA of slow deforming regions: the case of SW Iberia

A sanity check for earthquake recurrence models used in PSHA of slow deforming regions: the case of SW Iberia

Identification and characterization of geological formations with CO 2 storage potential in Portugal

Spatial and morphometric relationships of submarine landslides offshore west and southwest Iberia

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Product

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Identification and characterization of geological formations with CO ₂ storage potential in Portugal