Lonjakan magma tersembunyi memicu gempa bumi di bawah pulau Azores

Sebuah massa magma dalam jumlah besar melonjak ke atas di bawah Pulau São Jorge di kepulauan Azores, Portugal, pada Maret 2022, memicu ribuan gempa bumi sebelum terhenti di bawah permukaan tanah. Peristiwa yang dirinci dalam sebuah studi baru ini merupakan erupsi yang gagal, yang sempat meningkatkan namun akhirnya meredakan kekhawatiran akan aktivitas vulkanik.

Magma tersebut berasal dari kedalaman lebih dari 20 kilometer di bawah permukaan dan naik dengan cepat hanya dalam beberapa hari. Magma ini mengandung cukup banyak batuan cair untuk mengisi sekitar 32.000 kolam renang berukuran Olimpiade, namun terhenti di kedalaman 1,6 kilometer, yang menyebabkan permukaan pulau naik sekitar enam sentimeter. Sebagian besar gempa bumi terjadi setelah magma berhenti bergerak ke atas, dengan aktivitas terkonsentrasi di sepanjang Zona Patahan Pico do Carvão.

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