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Deep drilling in an active geothermal area in the Azores

Abstract

A deep borehole on São Miguel encountered temperatures exceeding 200° C at a depth of 550 m. Subaerial volcanics persist to a depth of 786 m below sea level and indicate an average subsidence of 0.1 cm yr−1 for the island over the past 690,000 Myr.

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Muecke, G., Ade-Hall, J., Aumento, F. et al. Deep drilling in an active geothermal area in the Azores. Nature 252, 281–285 (1974). https://doi.org/10.1038/252281a0

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