Ocean Island Volcanoes: Genesis, Evolution and Impact

Pimentel, Adriano; Ramalho, Ricardo; Becerril, Laura; Larrea, Patricia; Brown, Richard J.

doi:10.3389/978-2-88963-728-7

Cited by 1 publication

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“…These complexities, among other factors, result from the variety of styles of volcanic activity in the Azores (from the Hawaiian style, effusive, to the Plinian style, strongly explosive), the type of devices emitting volcanic lava, the magnitude of volcanic activity and erosive dynamics. Several studies on the geochemistry of rocks in the Azores have led to the conclusion that most occurrence of the volcanic rocks of this archipelago fall into alkaline magma series from basalt or alkali basalt to trachyte (Trota et al 2011;Jeffery and Gertisser 2020). This variety of eruptive styles creates a wide variety of lithologies.…”

Section: Geomechanical and Seismic Characteristics Of Volcanic Azorea...mentioning

confidence: 99%

Risk Analysis Management of Volcanic Slopes in São Miguel Island, Azores

Fernandez,

Oliveira,

Vargas

et al. 2024

Preprint

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The Azores Archipelago is affected by several geohazards and natural disasters, including earthquakes, volcanic eruptions, and extreme meteorological events. This makes this region quite susceptible to landslides. To ensure the safety of natural slopes, it is vital to systematically assess and manage risk to propose measures to reduce the geotechnical risk of slope instability. Volcanic formations are unique in that they typically exhibit sizeable natural variability of lithological formations and heterogeneities, with significant variations in geometry. Therefore, the existing standard characterisation systems do not consider the heterogeneous nature and unique characteristics of volcanic formations. The instability of a slope was selected for the analysis in Porto Formoso. The hill is located on the north coast of the island of S. Miguel, in the Azores archipelago. From a geological point of view, the slope consists of a volcanic rocky mass of a trachytic nature, which is covered superiorly by an incoherent deposit of a pomitic nature. A 3D numerical model using the Material Point Method (MPM) was developed and applied to the site, including seismic action considering the Portuguese regulations. A slope risk analysis was analyzed, considering the MPM numerical results. Finally, conclusions are drawn.

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Section: Geomechanical and Seismic Characteristics Of Volcanic Azorea...mentioning

confidence: 99%