Landslides and the evolution of El Hierro in the Canary Islands

Gee, M.J.R.; Watts, A. B.; Masson, Douglas G.; Mitchell, Neil C.

doi:10.1016/s0025-3227(01)00153-0

Cited by 115 publications

(100 citation statements)

References 39 publications

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“…Large-scale flank collapse can transport 100-mto kilometer-scale megablocks into the moats (e.g., Moore et al, 1994). The moat has a maximum of 3 km thickness by up to 160 km width at Hawaii (e.g., ten Brink and Watts, 1985;Moore et al, 1994), a maximum of 455 m thickness by up to 250 km width at the Canary Islands (Collier and Watts, 2001;Gee et al, 2001), and a maximum of 520 m thickness by up to 130 km width at La Réunion island (southwestern Indian Ocean; de Voogd et al, 1999;Oehler et al, 2008) (widths as measured from Figure 1 and from Oehler et al [2008]). Relatively little sediment is deposited on the flanks of the actual seamounts; these are dominated by sediment erosion and bypass into the moat (Leslie et al, 2002).…”

Section: Discussion Of Formation Models and Comparison To Volcaniclasmentioning

confidence: 99%

Seamount chain–subduction zone interactions: Implications for accretionary and erosive subduction zone behavior

Clarke

Vannucchi

Morgan

2018

Geology

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Sediment volume at the trench and topographic highs on the incoming plate are two of the main factors controlling whether a forearc will undergo subduction erosion or accretion. On oceanic plates, topographic highs such as large seamount complexes are commonly associated with significant volumes of flanking volcaniclastic sediments in the form of >100-kmwide debris aprons, with the largest deposits found in flexural moat basins. We propose that subduction of these sediment accumulations promotes localized frontal accretion, even in otherwise non-accretionary margins. The Osa mélange in southwestern Costa Rica is a field example that provides new insights into the nature and occurrence of this interaction. The southwestern margin of Central America is punctuated by accreted Late Cretaceous-middle Eocene seamounts that formed at the Galápagos hotspot and accreted throughout the late Miocene. In contrast to most accreted seamounts along this margin, which retained their overall structure, the Osa mélange is a chaotic mixture of seamount lithologies. It consists of basalt, chert, and carbonate blocks in a fine-grained pelitic matrix composed predominantly of feldspar and pyroxene grains with rare quartz. This lithology is consistent with sediment from a seamount chain's debris apron, such as the Hawaiian moat sampled during Ocean Drilling Program (ODP) Leg 136 and the Canary Islands moat sampled by ODP Leg 157. Subduction of seamounts and their debris aprons promotes concurrent accretion and erosion over short distances along the trench. This introduces heterogeneity into the subduction channel, with implications for deformation within the subduction zone plate interface.

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Section: Discussion Of Formation Models and Comparison To Volcaniclasmentioning

confidence: 99%

Seamount chain–subduction zone interactions: Implications for accretionary and erosive subduction zone behavior

Clarke

Vannucchi

Morgan

2018

Geology

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“…The Verrill Canyon area on the Scotian Slope and successive landslides in the Canary Islands illustrate such multi-phase mass-wasting processes (Mosher et al, 1994;Masson et al, 1998;Gee et al, 2001). The Humboldt Slide, on the northern California continental margin, is interpreted as a large shear-dominated retrogressive slope failure (Gardner et al, 1999).…”

Section: A Multi-phase Instability Event ?mentioning

confidence: 99%

The Gebra Slide: a submarine slide on the Trinity Peninsula Margin, Antarctica

et al. 2003

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A large submarine slide^the Gebra Slide^has been discovered on the continental margin of Trinity Peninsula, Central Bransfield Basin, Antarctic Peninsula. The slide scar is clearly expressed in the bathymetry and is cut into the toe of the glacial-period slope-prograding strata on the lower continental slope. Seismic data give evidence of an associated debris-flow deposit embedded in the interglacial-period basin-fill strata of the basin floor. The total volume of sediment involved in the mass movement is about 20 km 3 . Indirect dating of the mass-wasting event, based on seismic^stratigraphic relationships of the slide scar and associated debris-flow deposit with underlying glacial-period slope units and the overlying interglacial-period basin-floor units, suggests that it took place at the transition between the last glacial period and the present-day interglacial. The initiation of the Gebra Slide is attributed to a combination of several factors, such as high sedimentation rates during the last glacial period, the unloading effect of a retreating ice sheet during deglaciation, pre-existing tectonic fabric and high seismicity in the area. This is the first recent submarine slide of this size identified on the glacial, continental margins of Antarctica. In morphology and general characteristics it is quite similar to the well-known large-scale submarine slides from the northern hemisphere glacial margins, although it is smaller. Its most striking characteristic is its lower-slope position (at 1500^2000 m of water depth), which remains up to now difficult to explain. ß

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“…The only study that highlights some of the structural features on the submarine sector of the edifice is Acosta et al (2003b). Other studies have focused on documenting the extent and characteristics of the giant landslides on El Hierro and their offshore deposits (Gee et al, 2001a(Gee et al, , 2001bMasson, 1996;Masson et al, 2002;.…”

Section: Introductionmentioning

confidence: 99%

Volcano-structure of El Hierro (Canary Islands)

Becerril

Arnedo

Morales³

et al. 2016

Journal of Maps

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The first complete volcano-structural map of El Hierro (Canary Islands, Spain) has been developed in order to provide a tool for volcano-tectonic analyses and volcanic hazard evaluation on the island. This map is a synthesis of collated and interpreted field data and bathymetric maps. We have integrated information obtained from: (1) high-resolution digital elevation models, (2) bathymetric information, (3) topographic, geologic and geomorphological maps, (4) aerial photographs and orthoimages, (5) previous reports and scientific publications, and (6) new detailed field surveys. The 1:100,000-scale map includes the main volcano-structural elements such as vents, eruptive fissures, dykes, faults, and landslides scars. This information has been used for analysing the volcano-tectonic evolution of El Hierro and for estimating the probability of new vent opening on the island (i.e. volcanic susceptibility). We expect that this map will underpin future geological studies and future volcanic risk assessment. ARTICLE HISTORY

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Landslides and the evolution of El Hierro in the Canary Islands

Cited by 115 publications

References 39 publications

Seamount chain–subduction zone interactions: Implications for accretionary and erosive subduction zone behavior

Seamount chain–subduction zone interactions: Implications for accretionary and erosive subduction zone behavior

The Gebra Slide: a submarine slide on the Trinity Peninsula Margin, Antarctica

Volcano-structure of El Hierro (Canary Islands)

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