Felipe is motivated by the idea that H₂O vapor is the main component in volcanic gases. Therefore, tracking changes in water vapor is highly useful because it offers direct clues about magma movement, degassing processes, and potential hazards. He uses stable isotopes to distinguish the water vapor origin (magmatic, hydrothermal or meteoric) and uses in-house developed systems to make high-rate, direct measurements of major volatiles (H₂O, CO₂, and SO₂) to improve our understanding of underground magmatic processes.