Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)

Casillas, Ramón; Fernández, Carlos; Colmenero, Juan Ramón; Nuez, J. de la; García-Navarro, Encarnación; Martín, María Candelaria Afonso

doi:10.1007/s00445-010-0373-8

Cited by 12 publications

(4 citation statements)

References 40 publications

(4 reference statements)

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“…In La Gomera, from the modeling of the main magnetic source as a uniformly magnetized body, we conclude that the source magnetization is probably less than 3 A/m. The lower bulk magnetization of the La Gomera intrusive core, in comparison with those of the equivalent bodies in Tenerife and Gran Canaria, could be explained by the high degree of hydrothermal alteration observed in the Basal Complex materials on La Gomera (Casillas et al, ; Rodríguez‐Losada & Martínez‐Frías, ). Alternatively, it could be related with the geochronology of the intrusive core, about which no data are available.…”

Section: Discussionmentioning

confidence: 99%

“…The Lower Old Edifice was a large basaltic shield volcano with a diameter estimated as approximately 22 km built between 10.5 and 8.7 Ma. At approximately 9.4 Ma, the Tazo avalanche removed part of its northwestern flank, probably triggered by continuous magma injection through dikes in a rift zone oriented ENE‐WSW (Casillas et al, ; Fernández et al, ). Later, the San Marcos avalanche affected the northeastern flank just before 8.6 Ma (Ancochea et al, ) (Figure c).…”

Section: Geological Settingmentioning

confidence: 99%

“…After the first modern studies on the geology of La Gomera (Bravo, 1964;Cantagrel et al, 1984;Cendrero, 1970), three reconstructions of the volcanic history of this island are recently proposed (Ancochea et al, 2006;Cueto et al, 2004;Paris et al, 2005). In the last 15 years, work has focused on the study of abundant dike swarms (Ancochea et al, 2003;Ancochea et al, 2008;Márquez et al, 2018;Rodríguez-Losada & Martínez-Frías, 2004), the study of marine geomorphological features (Llanes et al, 2009), the characterization of gravitational landslides by structural analysis (Casillas et al, 2010;Fernández et al, 2015), and paleomagnetic data for studying a Miocene geomagnetic polarity transition (Caccavari et al, 2015). This wealth of knowledge has provided us with a rather good picture of La Gomera subaerial volcanic history, although little is known about the construction of the submarine edifice.…”

Section: Introductionmentioning

confidence: 99%

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Three‐Dimensional Magnetic Models of La Gomera (Canary Islands): Insights Into the Early Evolution of an Ocean Island Volcano

Blanco-Montenegro

Montesinos

Nicolosi

et al. 2020

Geochem Geophys Geosyst

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An aeromagnetic data set from the island of La Gomera was studied through two inverse modeling approaches that produced complementary views of the inner structure of this volcanic island: (1) a variable magnetization model that identified the main lateral magnetization contrasts and (2) a constant magnetization model that imaged the main magnetic source by assuming that it was a uniformly magnetized body. The modeling reveals intense magnetizations beneath the northern part of La Gomera, which occupy an important portion of the northern submarine edifice, correspond well with outcrops of the submarine volcano (Basal Complex), and confirm that most of the magnetic signal revealed by aeromagnetic mapping in the Canary Islands is due to the intense magnetizations of the intrusive complexes (plutonic bodies and dike complexes) emplaced during the initial stages of growth of the volcanic edifices. The consistency of our models with the results of a previous gravimetric study suggests that these intrusive complexes are denser and more magnetic than the surrounding rocks. The location of the main magnetic source reinforces the interpretation, first suggested by geological evidence, that the submarine and early subaerial growth of La Gomera started to the north of the present island. The elongated shape of these intrusive complexes with a nearly E‐W strike agrees with the orientation of analogous structures on Tenerife and Gran Canaria, suggesting that the initial formation of the central islands of the Canary Archipelago was controlled by a set of regional fractures in a strike‐slip tectonic framework.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three‐Dimensional Magnetic Models of La Gomera (Canary Islands): Insights Into the Early Evolution of an Ocean Island Volcano

Blanco-Montenegro

Montesinos

Nicolosi

et al. 2020

Geochem Geophys Geosyst

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“…Seafloor mapping of this region has been performed using side scan sonar and multibeam echosounder. Nine giant landslides are known from the island of La Gomera, seven are known from El Hierro, seven are known from Tenerife, four are known from Gran Canaria, three are known from La Palma, and one is known from each of the islands of Fuerteventura and Lanzarote (Carracedo et al 1999;Urgeles et al 1999;Gee et al 2001;Krastel et al 2001;Masson et al 2002;Acosta et al 2003;Ancochea et al 2006;Casillas et al 2010;Dávila Harris et al 2011;Hunt et al 2011;Boulesteix et al 2013;Hunt et al 2014;Becerril et al 2016;León et al 2017).…”

Section: North Atlantic Oceanmentioning

confidence: 99%

A Global Database of Giant Landslides on Volcanic Islands

Rowberry

Klimeš

Blahůt

et al. 2023

Progress in Landslide Research and Technology

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This paper describes a comprehensive online database of giant landslides on volcanic islands compiled by researchers from the Institute of Rock Structure and Mechanics, Czech Academy of Sciences, in the framework of IPL Project 212. The database was constructed from 2016 to 2018. It comprises a total of seventy-five events from the Atlantic Ocean and Mediterranean Sea, sixty-seven events from the Pacific Ocean, and forty events from the Indian Ocean. In this paper some of the main benefits of landslide inventories and thematic databases are outlined and the global distribution of giant landslides on volcanic islands is described in depth. The database is hosted on the website of the Institute of Rock Structure & Mechanics and records can be downloaded as a spreadsheet or kml file for integration in a number of geospatial programs including ArcGIS and Google Earth. However, since completion of the database in 2018, a number of potentially significant studies of giant landslides on volcanic islands have been published from archipelagos in the Atlantic and Pacific Oceans while outstanding modern analogues for past events are represented by the collapse of Anak Krakatau on 22 December 2018 and the collapse of Hunga Tonga-Hunga Haʻapai on 15 January 2022. Consequently, the recent literature will be scrutinized with the aim of updating information already contained in the database while two new layers are planned: the first of these will provide information about recent volcanic collapses and the second will provide information about the long-term instrumental monitoring of giant landslides. It is intended that the second release of the database will be available online in early 2023.

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Volcano Flank Instability and Collapse

Acocella

2021

Volcano-Tectonic Processes

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Deformation structures associated with the Tazo landslide (La Gomera, Canary Islands)

Cited by 12 publications

References 40 publications

Three‐Dimensional Magnetic Models of La Gomera (Canary Islands): Insights Into the Early Evolution of an Ocean Island Volcano

Three‐Dimensional Magnetic Models of La Gomera (Canary Islands): Insights Into the Early Evolution of an Ocean Island Volcano

A Global Database of Giant Landslides on Volcanic Islands

Volcano Flank Instability and Collapse

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