Mega-tsunami conglomerates and flank collapses of ocean island volcanoes
نویسندگان
چکیده
منابع مشابه
Rift zone reorganization through flank instability in ocean island volcanoes: an example from Tenerife, Canary Islands
The relationship between rift zones and flank instability in ocean island volcanoes is often inferred but rarely documented. Our field data, aerial image analysis, and Ar/Ar chronology from Anaga basaltic shield volcano on Tenerife, Canary Islands, support a rift zone— flank instability relationship. A single rift zone dominated the early stage of the Anaga edifice (~6–4.5 Ma). Destabilization ...
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Geological evidence suggests that during a future eruption, Cumbre Vieja Volcano on the Island of La Palma may experience a catastrophic failure of its west flank, dropping 150 to 500 km of rock into the sea. Using a geologically reasonable estimate of landslide motion, we model tsunami waves produced by such a collapse. Waves generated by the run-out of a 500 km (150 km) slide block at 100 m/s...
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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 t...
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Secondary magnetic fields are induced by the flow of electrically conducting seawater through the Earth's primary magnetic field ('ocean dynamo effect'), and hence it has long been speculated that tsunami flows should produce measurable magnetic field perturbations, although the signal-to-noise ratio would be small because of the influence of the solar magnetic fields. Here, we report on the de...
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ژورنال
عنوان ژورنال: Marine Geology
سال: 2018
ISSN: 0025-3227
DOI: 10.1016/j.margeo.2017.10.004