The last 5000 years of activity at Sete Cidades volcano (São Miguel Island,Azores): Implications for hazard assessment |
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| Authors: | G Queiroz JM Pacheco JL Gaspar WP Aspinall JE Guest T Ferreira |
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| Institution: | 1. Centro de Vulcanologia e Avaliação de Riscos Geológicos, Universidade dos Açores, Rua de S. Gonçalo, 9501-801 Ponta Delgada, Portugal;2. Department of Earth Sciences, Bristol University, Bristol BS8 1RJ, United Kingdom;3. Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom |
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| Abstract: | Sete Cidades is a central volcano with a summit caldera at the western end of São Miguel Island, Azores. Its stratigraphy comprises two main geological groups: the Inferior Group, the units of which date from more than 200 000 years ago through to 36 000 years before present, consisting of thick lava flows and subaerial volcaniclastic deposits that built the base of the central volcano; and the Superior Group which comprises all the activity from the last 36 000 years, including pumice and scoria fallout and PDC deposits with minor lava flows. The volcanostratigraphy is divided into six main formations — Risco, Ajuda, Bretanha, Lombas, Santa Bárbara and Lagoas, each defined by different activity phases in the volcano's evolution. |
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| Keywords: | Sete Cidades volcano volcanostratigraphy eruptive scenarios hazard event tree |
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