Ascensão silenciosa de magma provocou terremotos sob ilha nos Açores

Uma enorme massa de magma subiu sob a Ilha de São Jorge, no arquipélago português dos Açores, em março de 2022, desencadeando milhares de terremotos antes de estagnar no subsolo. O evento, detalhado em um novo estudo, representou uma erupção frustrada que aumentou, mas acabou por aliviar, os temores de atividade vulcânica.

O magma originou-se a mais de 20 quilômetros abaixo da superfície e ascendeu rapidamente em apenas alguns dias. Ele continha rocha fundida suficiente para encher aproximadamente 32.000 piscinas olímpicas, mas parou a uma profundidade de 1,6 quilômetros, fazendo com que a superfície da ilha se elevasse cerca de seis centímetros. A maioria dos terremotos ocorreu depois que o magma parou de subir, com a atividade concentrada ao longo da Zona de Falha do Pico do Carvão.

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