[M-IS03] Structure and deformation in the overlying plate due to subduction and related feedbacks

convener:Hiroshi Sato(Earthquake Prediction Research Center, Earthquake Research Institute, The University of Tokyo), David A Okaya(University of Southern California), Eh Tan(Institute of Earth Sciences, Academia Sinica), Masahiro Ishikawa(Graduate School of Environment and Information Sciences Yokohama National University)

Subduction over time modifies the overriding plate by fractionation, accretion, and tectonic deformation. This can lead to processes such as tectonic shortening (orogeny), regional uplift, weakening by back-arc spreading and volcanism, basin formation, and/or destabilization of the lithosphere. In turn, the composition, strength, and morphology of the overlying plate, which may be the product of a long geological history and have significant along-strike variations, can affect current large-scale subduction dynamics such as slab dip, and ultimately broad-scale plate kinematics in two and three dimensions. Examples of geological settings that bear witness to these processes are found along the Pacific Rim, including Japanese arcs, Taiwan, Hikurangi, northwestern North America, and Tethys margin, including Himalaya and the Mediterranean mobile belt. We seek contributions from all geoscience disciplines that document the structure and tectonic evolution of overlying plate deformation and their feedbacks onto subduction processes. We welcome studies on topics such as: geologic and tectonic geomorphological deformation of the overlying plate and its relation to the subduction; geodetic deformation of the overlying plate; active and passive imaging of the overlying plate and crustal structure; rheological features obtained by laboratory and earthquake seismology; basin development and mountain building processes; numerical geodynamical modeling of overlying plate deformation; and backarc opening proceses. Comparisons of the Nankai and Japan Trench subduction systems to other global subduction zones are of particular interest. This session is supported by ILP (International Lithosphere Program).

+Add all to schedule

[MIS03-01] Crustal structure of the Nankai subduction zone revealed by two decades of onshore-offshore and ocean-bottom seismometer data

*Dan Bassett¹, Adrien Arnulf², Shuichi Kodaira³, Ayako Nakanishi³, Alistair Harding⁴ (1.GNS Science, 2.University of Texas at Austin, 3.JAMSTEC, 4.Scripps Institution of Oceanography)

[MIS03-02] Lower lomit of seismogenic zone beneath Japan based on hyopocenter catalog determined with 3D seismic velocity structure

*Makoto MATSUBARA¹, Tomoko Elizabeth Yano¹, Hiroshi Sato² (1.National Research Institute for Earth Science and Disaster Resilience, 2.Earthquake Research Institute, the University of Tokyo)

[MIS03-03] Thermal structure of the Honshu arc deduced from high P-T ultrasonic experiments and seismic tomography

*Masahiro Ishikawa¹, Shigeki Sugita¹, Satoshi Fukunaga² (1.Graduate School of Environment and Information Sciences, Yokohama National University, 2.College of Engineering Science, Yokohama National University)

[MIS03-04] Back-arc spreading induced by weakening in the overriding plate and mantle wedge

*Eh Tan¹, Chi-Chin Lee² (1.Institute of Earth Sciences, Academia Sinica, 2.Department of Geosciences, National Taiwan University)

[MIS03-05] Origin of seismogenic source faults in the backarc of Honshu, Japan.

*Hiroshi Sato¹, Tatsuya Ishiyama¹, Tetsuo No², Makoto MATSUBARA³, Shuichi Kodaira² (1.Earthquake Research Institute, The University of Tokyo, 2.Japan Agency for Marine-Earth Science and Technology, 3.National Research Institute for Earth Science and Disaster Resilience)

[MIS03-06] Stress loading on crustal source faults due to megathrust coupling: the Nankai Trough and the Kuril trench

*Akinori Hashima¹, Hiroshi Sato¹, Tatsuya Ishiyama¹, Andrew M. Freed², Thorsten W. Becker³ (1.Earthquake Research Institute, University of Tokyo, 2.Purdue University, 3.The University of Texas at Austin)