Deep-water seamounts, a potential source of tsunami generated by landslides? The Hirondelle Seamount, NE Atlantic

Omira, Rachid; Ramalho, Inês; Terrinha, Pedro; Baptista, Maria Ana; Batista, Luís; Zitellini, Nevio

doi:10.1016/j.margeo.2016.06.010

Cited by 31 publications

(15 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a widely distributed geomorphic unit in global bathymetry, seamounts have generally been defined as extinct or active volcanoes rising more than 100 m above the surrounding seafloor [Smith and Cann, 1990;Behn et al, 2004;Kim and Wessel, 2011]. Previous studies have revealed that seamounts may play important roles including, being a potential location for mineral resources [Grigg et al, 1987;Sarma et al, 2013], affecting global ocean circulation [Gille et al, 2004;Chen et al, 2015], and contributing to tsunami wave propagation [Mofjeld et al, 2004;Omira et al, 2016]. Intraplate seamounts (e.g., the Hawaiian-Emperor seamount trail) can form at large distances from plate tectonic boundaries, where most volcanic activity occurs.…”

Section: Introductionmentioning

confidence: 99%

New insights into the magmatism in the northern margin of the South China Sea: Spatial features and volume of intraplate seamounts

Fan

Xia

Zhao

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

The extensive intraplate seamounts are obvious features in the northern South China Sea (SCS). However, the distribution, volume, and origin of these seamounts are not well understood, which greatly hinders our understanding of magmatism in the SCS. Based on high‐resolution bathymetric data and 147 seismic profiles, and combining gravity and magnetic data, we first identify 45 seamounts in the northern margin of the SCS and simulate their shape with elliptical cones. Results show that the total volume of these 45 seamounts above seafloor is estimated at about 1885–3078 km3 and the total volume of intrusive magma above Moho is about 0.15 Mkm3, which is close to the estimates for classic large igneous provinces across the world. These seamounts are mostly located on the continental slope with thin crust (approximately 12–18 km), which reduces the overlying pressure and shortens the magmatic conduits. The dominant azimuth of elliptical major axis in seamounts is consistent with the synrift and synspreading fault strikes (NE‐NEE), indicating that these preexisting faults provide magmatic conduits for the subsequent postrift intraplate seamounts. Based on three existing clues, i.e., (1) the intraplate seamounts, high velocity layer and Hainan mantle plume are contiguous in 3‐D space, (2) the high‐velocity layer is thicker beneath the continental shelf but thinner beneath the slope, and (3) the basalts dredged from certain seamounts show OIB‐type geochemical features, we propose a magmatic upwelling pattern which contains Hainan mantle plume to explain the spatial and morphological characteristics of these intraplate seamounts.

show abstract

Section: Introductionmentioning

confidence: 99%

New insights into the magmatism in the northern margin of the South China Sea: Spatial features and volume of intraplate seamounts

Fan

Xia

Zhao

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…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%

“…The MAGICLAND dataset derived from the need of thoroughly compiling submarine landslide evidences offshore west and southwest Iberia. Studies of specific large landslides (Omira et al 2016;Gamboa et al 2021a) or assessments of limited areas (Camerlenghi et al 2010) of this margin have been made, but not to this areal extent or scales of analysis. Our results serve a two-fold objective.…”

Section: Database Applications and Limitationsmentioning

confidence: 99%

“…First, the provision of a data of value for wide-coverage databases of submarine landslide morphometry, immediately complimentary of landslide databases on the Spanish EEZ (León et al 2020) and relevant for broader global scale objectives (Clare et al 2019). Second, to pinpoint bathymetric features or areas of occurrence of large landslides that can have high tsunamigenic potential, especially ones on flanks of large seamounts (Harbitz et al 2014;Omira et al 2016). As mentioned, the sole use of DEM data presents limitations for the full characterisation of the landslides and their flow dynamics or preservation potential as no subsurface data can be provided, and absolute runout distances and paths can be underestimated.…”

Section: Database Applications and Limitationsmentioning

confidence: 99%

“…However, submarine landslides are a primary geohazard in marine environments and the extensive characterisation of their occurrence, at all scales and ages, on proximal and distal oceanic regions is crucial. Tsunamis generated from landslides on the flank of subaerial topography plunging into the sea (Siebert 1984;Ward and Day 2001;Bardet et al 2003) or from large collapses on fully submerged morphologies (Harbitz et al 2014;Omira et al 2016) area a major concern. Moreover, seabed geotechnical installations and infrastructures such as submarine communication cables, pipelines, submarine observatories or any purposebuild platform are sensible to underwater mass movements (Pope et al 2015;Clare et al 2019).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Gamboa¹,

Omira²,

Terrinha³

2021

Preprint

Self Cite

View full text Add to dashboard Cite

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.

show abstract

On the inference of tsunami uncertainties from landslide run-out observations

Zengaffinen-Morris¹,

Úrgeles

Løvholt³

2021

Preprint

View full text Add to dashboard Cite

show abstract

Deep-water seamounts, a potential source of tsunami generated by landslides? The Hirondelle Seamount, NE Atlantic

Cited by 31 publications

References 48 publications

New insights into the magmatism in the northern margin of the South China Sea: Spatial features and volume of intraplate seamounts

New insights into the magmatism in the northern margin of the South China Sea: Spatial features and volume of intraplate seamounts

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

On the inference of tsunami uncertainties from landslide run-out observations

Contact Info

Product

Resources

About