Abstract: Kīlauea volcano is one of the most active volcanoes on Earth, erupting regularly from vents at its summit and along its Southwest and East Rift Zones (ERZ). Seismicity and deformation provide constraints on Kīlauea’s shallow magmatic system, but geophysical imaging remains sparse outside the summit area. I will present geophysical model results from magnetotelluric data that cover the entire subaerial volcanic system. 3D resistivity models image a stacked magmatic system, with shallow and deep reservoirs connected by seismicity. The shallow system connects the summit to Pu`u O`o cone, the source of near continuous eruption from 1983-2018. A deeper magmatic system containing 3-4 km3 of melt is thought to have fed the 2018 eruption along the lower ERZ. No electrically conductive connection exists between the summit and the 2018 eruption vents, implying that the dikes feeding the eruption solidified on a time scale of month to years. Different transport pathways through Kīlauea’s complex magmatic system can explain the varied observations (seismicity, geobarometry, petrology, deformation) and styles of eruption (summit, fissure, and extra-caldera vent eruptions as well as rift-zone intrusions). The F-shaped magmatic system further explains aspects of the 2018 eruption chronology and places melt inclusion data from this and prior eruptions into context. Finally, the geophysical model sheds light on tectonic/ magmatic interactions, such as the escape of Kīlauea’s mobile south flank, and the evolution of the volcano, including formation of its cumulate core and migration of its rift zones through time.

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