S (Solid Earth Sciences ) » S-CG Complex & General
[S-CG71] Volcanic roots
convener:Naofumi Aso(Tokyo Institute of Technology), Tsuyoshi Iizuka(University of Tokyo), Shuhei Sakata(Earthquake Research Institute, The University of Tokyo), Yohei Yukutake(Hot Springs Research Institute of Kanagawa Prefecture)
The magma transport system beneath volcanoes is a key to understand geodynamics and the evolution of the Earth. To understand the deep volcanic roots around the lower crust, including deep magma chambers, we need to integrate studies based on various approaches. As seismological evidence, deep long-period earthquakes around the Moho beneath active volcanoes are interpreted to relate to the magma transport system. It is therefore essential to investigate seismicity with a high-resolution hypocenter distribution and focal mechanisms of deep long-period earthquakes. Physical understanding of these events will guide us to reveal the role of deep long-period earthquakes in the magma transport system. Also, high-resolution seismic or electrical resistivity imaging is essential to understand physical properties at the depths and to visualize the magma transport system. Besides, the petrological and geochemical properties of igneous rocks provide important information on the origin of magma and its evolutionary processes including fractional crystallization, assimilation, and mixing at the deeper part of the crust. In particular, microscale chemical and isotopic analyses of minerals with compositional zoning provide important constraints on the evolution of magma chambers. We welcome studies to understand volcanic roots from a variety of approaches including but not limited to the methods mentioned above.
*Naofumi Aso1 (1.Tokyo Institute of Technology)
*Manami Suzuki 1, Tomomi Okada1, Akiko Hasemi1, Toru Matsuzawa1, Norihito Umino1, Takashi NAKAYAMA1, Noriko Tsumura2, Tadashi Yamashina3, Group for the aftershock observations of the 2011 off the Pacific of Tohoku Earthquake (1.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, 2.Graduate School of Science, Chiba University, 3.Faculty of Science and Technology, Kochi University)