Three-dimensional density tomography determined from multi-directional muography of the Omuroyama scoria cone, Higashi–Izu monogenetic volcano field, Japan

Abstract Scoria cone is one of the basic forms volcanoes, and clarifying its detailed internal structure magma movement during formation important for understanding nature eruptions also volcanic disaster mitigation. We conducted a multi-directional muographic survey Omuroyama scoria cone, Japan, in order to determine three-dimensional density cone. used nuclear emulsion detector optimized muography that was installed at 11 sites around volcano. Muon tracks recorded on films were read with high-speed automated readout system. obtained by applying linear inversion images, evaluated uncertainties. High-density zones detected Based these observations topographic geological constraints, we infer high-density are central, highly welded vent three-directional radial dikes extending from central vent, respectively. an E-W-trending dike fed small lava flow, SSE-NNW-trending caused flank eruption produced crater Our results visualize volcanoes novel resolution, thereby demonstrate process can be discussed detail. Since it has been difficult directly detect such clear visualization structures eruptive processes past, resulted providing hope activity.