Host: Japan Association of Mineralogical Sciences
Miocene felsic volcanic field at the Kii Peninsula (MFVK) in southwest Japan allows us to reveal temporal and spatial change of a large felsic volcanic system in response to changes in the local and regional stress field. Approximately 1,500 km3 of magma were erupted from the MFVK. An area normalized eruption rate is ranked as one of the larger rates of LFVF worldwide. The large eruption rate is due to a large magma supply in combination with local and regional stress conditions, promoting magma accumulation for a large silicic magma chamber. We suggest that such a large magma chamber can generate excess pressure inside the chamber itself that results in a local tumescence and counteracts the tectonic compressional stress field, allowing magma to reach the surface.
