[S-SS17] Seismic evidence of volcanic roots

[SSS17-05] Seismic imaging of deep structure beneath active volcanoes

*Junichi Nakajima¹ (1.Department of Earth and Planetary Sciences, Tokyo Institute of Technology)

Keywords:S-wave reflector, seismic tomography, low-frequency earthquakes

Seismological observations clearly show that flux melting in the mantle wedge is a deep source of magmatism in subduction zones and generated melts are transported to the continental crust through a mantle upwelling flow. However, physical processes of magmatism beneath deep crust are poorly understood. Here I review seismological structures (seismic velocity and attenuation, S-wave reflectors, and low-frequency earthquakes) beneath active volcanoes in Japan, focusing on deep magma chambers and possible pathways of magmatic fluids to the upper crustal levels.