The objective of this Chapman Conference is to identify the most promising ways to improve our understanding of how large silicic magma systems grow and erupt by merging views from the geophysics, petrology, geochronology, and modeling communities.

Specifically we aim to address the following questions:

  • What are the obstacles to improving the resolution of 3D geophysical (seismic, magnetotellurics (MT), gravity) images of the geometry, size, architecture, and state (melt vs. mush) of silicic magma reservoirs and how can they be overcome? Can petrologic information from plutons or extrusive rocks help provide better resolution? What is needed to assemble successive 3D images that might lead to a new 4D understanding?
  • How and on what time scales do large silicic magmatic systems develop and grow? Do they experience cycles of evolution? How do we combine numerical models and petrological information that link magma reservoir processes (intrusion, mixing, volatile exsolution, phase equilibria changes) with crustal behavior (heating, inflation, faulting)? What do plutonic volcanic products reveal about the growth and evolution of silicic systems?
  • What do remotely detected geophysical phenomena (e.g., surface inflation/deflation, earthquake patterns, gravity changes, resistivity changes) tell us about processes and rates of magma reservoir growth, volatile evolution, and the triggering of eruptions? How can we better interpret the data sets used to monitor unrest together with petrological indicators (depth; time scales between intrusion and eruption), gas measurements, and numerical simulations so as to improve the capability to forecast eruptions from large silicic systems? Can the short periods of instrumentally-monitored unrest provide insight about long-term evolution?