scholarly journals Flank collapse and large-scale landsliding in the Cape Verde Islands, off West Africa

2008 ◽  
Vol 9 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
D. G. Masson ◽  
T. P. Le Bas ◽  
I. Grevemeyer ◽  
W. Weinrebe
Keyword(s):  
West Africa ◽  
Large Scale ◽  
Cape Verde ◽  
Cape Verde Islands ◽  
Flank Collapse

scholarly journals Exploring the links between volcano flank collapse and the magmatic evolution of an ocean island volcano: Fogo, Cape Verde

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mélodie-Neige Cornu ◽  
Raphaël Paris ◽  
Régis Doucelance ◽  
Patrick Bachélery ◽  
Chantal Bosq ◽  
...  
Keyword(s):  
Large Scale ◽  
Low Frequency ◽  
Frequency Instability ◽  
Cape Verde ◽  
Magma Storage ◽  
Ocean Island ◽  
Flank Collapse ◽  
Time Space ◽  
Before And After ◽  
Low Frequency Instability

AbstractMass-wasting of ocean island volcanoes is a well-documented phenomenon. Massive flank collapses may imply tens to hundreds of km3 and generate mega-tsunamis. However, the causal links between this large-scale, low-frequency instability, and the time–space evolution of magma storage, crystal fractionation/accumulation, lithospheric assimilation, and partial melting remains unclear. This paper aims at tracking time variations and links between lithospheric, crustal and surface processes before and after a major flank collapse (Monte Amarelo collapse ca. 70 ka) of Fogo volcano, Cape Verde Islands, by analysing the chemical composition (major, trace elements, and Sr–Nd–Pb isotopes) and age-controlled stratigraphy (K–Ar and Ar–Ar dating) of lavas along vertical sections (Bordeira caldera walls). The high-resolution sampling allows detecting original variations of composition at different time-scales: (1) a 60 kyrs-long period of increase of magma differentiation before the collapse; (2) a 10 kyrs-long episode of reorganization of magma storage and evacuation of residual magmas (enriched in incompatible elements) after the collapse; and (3) a delayed impact at the lithospheric scale ~ 50 kyrs after the collapse (increasing EM1-like materiel assimilation).

Oxygen, hydrogen, and helium isotopes for investigating groundwater systems of the Cape Verde Islands, West Africa

2009 ◽  
Vol 17 (5) ◽  
pp. 1157-1174 ◽  
Author(s):  
Victor M. Heilweil ◽  
D. Kip Solomon ◽  
Stephen B. Gingerich ◽  
Ingrid M. Verstraeten
Keyword(s):  
West Africa ◽  
Cape Verde ◽  
Helium Isotopes ◽  
Cape Verde Islands ◽  
Groundwater Systems

scholarly journals Hazard potential of volcanic flank collapses raised by new megatsunami evidence

2015 ◽  
Vol 1 (9) ◽  
pp. e1500456 ◽  
Author(s):  
Ricardo S. Ramalho ◽  
Gisela Winckler ◽  
José Madeira ◽  
George R. Helffrich ◽  
Ana Hipólito ◽  
...  
Keyword(s):  
Large Scale ◽  
Cape Verde ◽  
Volume Flux ◽  
Cape Verde Islands ◽  
The Real ◽  
Hazard Potential ◽  
Volcanic Islands ◽  
Run Up ◽  
Santiago Island ◽  
The Impact

Large-scale gravitational flank collapses of steep volcanic islands are hypothetically capable of triggering megatsunamis with highly catastrophic effects. Yet, evidence for the generation and impact of collapse-triggered megatsunamis and their high run-ups remains scarce or is highly controversial. Therefore, doubts remain on whether island flank failures truly generate enough volume flux to trigger giant tsunamis, leading to diverging opinions concerning the real hazard potential of such collapses. We show that one of the most prominent oceanic volcanoes on Earth—Fogo, in the Cape Verde Islands—catastrophically collapsed and triggered a megatsunami with devastating effects ~73,000 years ago. Our deductions are based on the recent discovery and cosmogenic3He dating of tsunamigenic deposits found on nearby Santiago Island, which attest to the impact of this giant tsunami and document wave run-up heights exceeding 270 m. The evidence reported here implies that Fogo’s flank failure involved at least one fast and voluminous event that led to a giant tsunami, in contrast to what has been suggested before. Our observations therefore further demonstrate that flank collapses may indeed catastrophically happen and are capable of triggering tsunamis of enormous height and energy, adding to their hazard potential.

scholarly journals Diffuse CO2 degassing and volcanic activity at Cape Verde islands, West Africa

2015 ◽  
Vol 67 (1) ◽  
Author(s):  
Samara M Dionis ◽  
Nemesio M Pérez ◽  
Pedro A Hernández ◽  
Gladys Melián ◽  
Fátima Rodríguez ◽  
...  
Keyword(s):  
West Africa ◽  
Volcanic Activity ◽  
Cape Verde ◽  
Cape Verde Islands ◽  
Co2 Degassing

scholarly journals Phylogeography and invasion history of Aedes aegypti , the Dengue and Zika mosquito vector in Cape Verde islands (West Africa)

2019 ◽  
Vol 12 (9) ◽  
pp. 1797-1811 ◽  
Author(s):  
Patrícia Salgueiro ◽  
Célia Serrano ◽  
Bruno Gomes ◽  
Joana Alves ◽  
Carla A. Sousa ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
West Africa ◽  
Cape Verde ◽  
Mosquito Vector ◽  
Invasion History ◽  
Cape Verde Islands ◽  
History Of
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