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xvii Chapter 1: Introduction1 1.1 The role of gas in volcanism  1 1.2 Measurement of volcanic gases  2 1.2.1 Direct sampling  3 1.2.2 Satellite measurements  4 1.2.3 Ground-based remote sensing  4 1.2.3.1 COSPEC  5 1.2.3.2 Miniature DOAS-based spectrometers  6 1.2.3.3 UV cameras  7 1.3 Objectives  11 1.4 Study sites  12 1.4.1 Fuego volcano, Guatemala  12 1.4.1.1 Geologic setting  12 1.4.1.2 Recent volcanic activity  13 1.4.1.3 Previous Studies  14 1.4.2 Kilauea volcano, Hawaii  15 1.4.2.1 Geologic setting  15 1.4.2.2 Recent volcanic activity  16 1.4.2.3 Previous and Relevant Studies  17 1.4.2.3.1 Gas studies at Kilauea 17 1.4.2.3.2 Seismo-acoustic studies at Kilauea 18 1.4.2.3.3 Integration of gas and geophysics at Kilauea 20 1.5 Dissertation format  21 1.6 References  21

Ultraviolet digital imaging of volcanic plumes : implementation and application to magmatic processes at basaltic volcanoes