Madeira & Silveira 2003, hlm. 748 Madeira, José; Silveira, António Brum da (2003), "Active Tectonics and First Paleoseismological Results in Faial, Pico and S. Jorge Islands (Azores, Portugal)", Annals of Geophysics(PDF), 46 (5), Bologna: INGV, Istituto Nazionale di Geofisica e Vulcanologia, hlm. 733–761, diarsipkan(PDF) dari versi asli tanggal 2017-08-08, diakses tanggal 2017-12-14
Madeira & Silveira 2003, hlm. 748 Madeira, José; Silveira, António Brum da (2003), "Active Tectonics and First Paleoseismological Results in Faial, Pico and S. Jorge Islands (Azores, Portugal)", Annals of Geophysics(PDF), 46 (5), Bologna: INGV, Istituto Nazionale di Geofisica e Vulcanologia, hlm. 733–761, diarsipkan(PDF) dari versi asli tanggal 2017-08-08, diakses tanggal 2017-12-14