Many active volcanic areas in the world are densely inhabited. Large towns are built at the foot of volcanoes, or inside volcanic fields, resulting in a very high volcanic hazard due to the combination of high volcanic risk and a large population. Vesuvius, Campi Flegrei, and Etna (Italy); Marapi (Indonesia); Teide (Tenerife, Canary Islands); Guagua Pichincha (Ecuador); Popocatepetl (Mexico); Aso, Sakurajima, and Unzen (Japan); and Mayon and Pinatubo (Philippines) are only a few of the active volcanoes sited in densely populated areas. Monitoring these volcanoes with modern technology is critical to mitigating volcanic hazard through the detection of any possible...

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