Associate Professor
Atmosphere and Ocean Research Institute

Office: Atmosphere and Ocean Research Institute-752
TEL: +81-4-7136-6122
FAX: --

Research Field

Marine geology, structural geology, tectonics

Current Research

Various spectrum of earthquakes in subduction zones occur during a part of large scale tectonic processes such as acceretionary prism formation or subduction erosion, as well as reflect coupling processes of shear deformation and reaction/fluid flow in microscopic view. To understand earthquakes in subduction zones in geological context, I investigate structural and chemical analyses, physical property measurement, age dating and deformation/reaction experiments by using samples taken during geological field survey, deep sea drilling, and shallow subseafloor coring. Specific research topics are as follows:
(1) Tectonics of modern and ancient accretionary prisms based on structural analysis, thermal maturity measurement and age dating.
(2) Diagenesis and physical property change in subducting sediment and oceanic crust and modeling of pore pressure along plate boundary.
(3) Evaluating seamount asperity/seamount creep hypotheses based on on-land geology, marine geology and sandbox experiment.
(4) Sedimentation/erosion dynamics of horst-graben of the Japan Trench and documentation of outer rise earthquakes.
(5) Quantitative evaluation of mineral vein formation in accretionary complex and metamorphic belt.

Representative Publications

1. Yamaguchi, A., Cox, S.F., Kimura, G., Okamoto, S., 2011, Dynamic changes in fluid redox state associated with episodic fault rupture along a megasplay fault in a subduction zone. Earth and Planetary Science Letters, 302, 369–377. doi:10.1016/j.epsl.2010.12.029
2. Yamaguchi, A., Sakaguchi, A., Sakamoto, T., Iijima, K., Kameda, J., Kimura, G., Ujiie, K., Chester, F.M., Fabbri, O., Goldsby, D., Tsutsumi, A., Li, C.-F., Curewitz, D., 2011, Progressive illitization in fault gouge caused by seismic slip propagation along a megasplay fault in the Nankai Trough. Geology, 39, 995–998. doi:10.1130/G32038.1
3. Yamaguchi, A., Hina, S., Hamada, Y., Kameda, J., Hamahashi, M., Kuwatani, T., Shimizu, M., Kimura, G., 2016, Source and sink of fluid in pelagic siliceous sediments along a cold subduction plate boundary. Tectonophysics, 686, 146–157. doi: 10.1016/j.tecto.2016.07.030