-------------------------------------------------------------------------------- INTERNATIONAL SYMPOSIUM ON NEW IMAGES OF THE EARTH'S INTERIOR THROUGH LONG-TERM OCEAN-FLOOR OBSERVATIONS -------------------------------------------------------------------------------- Venue: Kazusa Akademia Center, Chiba Prefecture, Japan Time: November 6-8, 1997 Updated informations regarding the symposium will be posted at the OHP homepage site http://eri-ndc.eri.u-tokyo.ac.jp/OHP_sympo/. SCHEDULE: Nov. 5 Registration and Ice breaker at Kazusa Akademia Center Nov. 6 Scientific Sessions and Banquet Nov. 7 Scientific Sessions Nov. 8 Scientific Sessions PROGRAM: ***Nov. 6 morning*** Session 00: The Ocean Hemisphere Network Project (OHP) 8:30 Yoshio Fukao (ERI, U of Tokyo) Session 11: Oceanic Plates, Upper Mantle, Global Structure (Chairpersons: Y. Fukao, H. Igel) 8:45 David Bercovici (University of Hawaii) Generation of plate tectonics and plate boundaries from lithosphere-mantle flow and void-volatile self-lubrication (D. Bercovici) 9:15 James B. Gaherty (MIT) Seismological Structure of the Upper Mantle: A Regional Comparison of Seismic Layering (J.B. Gaherty, T.H. Jordan, M. Kato) 9:45 comment by Toshiro Tanimoto (UC Santa Barbara) OHP and Seismic Structure in the Western Pacific (T. Tanimoto) 10:00 comment by S. Karato (University of Minnesota) Evolution of Oceanic Lithosphere: Paradigms and Paradoxes of Oceanic Lithosphere 10:15 Walter D. Mooney (USGS) New Image of Continental Roots Based on Crustal Isostasy: An Interpretation Constrained by Data from Global Tomography and Mantle Kimberlites (W. Mooney and J. Vidale) 10:35 break 10:50 Barbara Romanowicz (Univ. of California at Berkeley) Waveform inversion for whole mantle structure using coupled modes (B. Romanowicz, X.-D. Li, C. Megnin, L. Breger) 11:20 comment by Robert J. Geller (Tokyo University) Optimally accurate numerical schemes for computing synthetic seismograms (R.J. Geller, N. Takeuchi, H. Mizutani) (Poster S03) 11:35 Adam Schultz (University of Cambridge) Three Dimensional Electrical Conductivity Structure of the Upper Mantle through the Transition Zone: Resolution Improvement and the Role of Permanent Ocean Bottom Observatories (Adam Schultz) 12:05 Yoshimori Honkura (Tokyo Intistute of Technology) Global Electromagnetic Response and the Conductivity Distribution in the Mantle (Y. Honkura and M. Matsushima) ================ 12:30 lunch ================ ***Nov. 6 afternoon*** Session 12: Mantle Tomography (Chairperson: T. Tanimoto) 2:00 Steve Grand (University of Texas at Austin) Global S-Wave Tomography and the Fate of Slabs (S. Grand) 2:30 comment by Sri Widiyantoro (Bandung Institute of Technology) Large scale structure of Earth's mantle from travel time tomography (R. van der Hilst, S. Widiyantoro, and B. Kennett) 2:45 comment by Masayuki Obayashi (ERI) Comparison of recent tomographic models, (M. Obayashi, T. Sakurai and Y. Fukao) (Poster S17) 2:55 comment by Takatoshi Yanagisawa (University of Tokyo) The Depth-dependent Skewness of S-wave Velocity Deviation Estimated from Global Mantle Tomography (T. Yanagisawa and Y. Hamano) (Poster G16) 3:10 Hendrik van Heijst (Oxford University) Transition zone tomography using surface wave overtone phase velocity measurements. (H. van Heijst and J. Woodhouse) 3:30 Adam M. Dziewonski (Harvard University) Anomalous Properties of the Pacific Hemisphere from Lithosphere to the Core-Mantle Boundary (A. M. Dziewonski, G. Ekstrom, Y. Gu and X.-F. Liu) 4:00 break Session 13: Poster session: OHP network and seafloor observations (P01-P21) 4:10 Yozo Hamano (University of Tokyo) OHP Network: Science plan 4:30 poster session 6:30 Panel discussion Panelists: J.-P.Montagner, H.Utada, P.Tarits, B.Romanowicz, D.Wiens, J.Kasahara ================ 7:30 Banquet ================ ***Nov. 7 morning*** Session 21: Slab, Mantle Transition Zone: (Chairpersons: S. Kaneshima, J. Gaherty) 8:30 Michael Gurnis (Caltech) Three-dimensional dynamic models of slabs (M. Gurnis, S. Zhang, and L. Moresi) 9:00 Tetsuzo Seno (ERI, Univ of Tokyo) Western Pacific dynamics revealed by slab stresses (T. Seno) 9:20 comment by Craig R. Bina (Northwestern University) Seismogenic Stresses from Phase Transitions (C. R. Bina) 9:35 Tetsuo Irifune (Ehime Univ.) Phase transformations in a pyrolite composition: implications for nature of the major seismic discontinuities in the Earth's mantle (T. Irifune) 10:05 break 10:20 Douglas Wiens (Washington University) The structure of the Tonga Slab and Lau Backarc from a combined land-sea seismograph deployment (D. Wiens, K. Koper, Y. Xu, L. Dorman J. Hildebrand, S. Webb, D. Zhao) 10:40 Fumiko Tajima (Univ. of Texas at Austin) Characteristics of the upper mantle transition zone anomalies associated with subduction zones in the northwestern Pacific (F. Tajima and S. P. Grand) 11:00 comment by Lev Vinnik (Institute of Physics of the Earth) Comments on images of the Mantle Transition Zone beneath the easternmost Eurasia (L. Vinnik) 11:15 Charles Estabrook (GeoForschungsZentrum Potsdam) Effects of the Subducting Pacific Plate on the Upper-mantle Seismic Discontinuities (Estabrook, Li, Yuan, Kind) 11:35 John Castle (University of Washington) The 660-km discontinuity beneath Izu-Bonin: Implications for tectonic history, deep earthquakes, and slab strength (J. Castle and K. Creager) 11:55 Alessandro Forte (Institut de Physique du Globe de Paris) Seismic-Geodynamic Constraints on Vertical Mantle Flow: The Importance of Topography at 660 km Depth (A. M. Forte & R. L. Woodward) ================ 12:25 lunch ================ ***Nov. 7 afternoon*** Session 22: Mid and Lower Mantle (Chairperson: S. Grand) 2:00 David A. Yuen (Univ. Minnesota, Twin Cities) Effects of the Mid-mantle Viscosity and Phase Structure on Mantle Convection (L. Cserepes, D. A. Yuen, B. S. Schoeder) 2:30 Hitoshi Kawakatsu (ERI, U of Tokyo) Below the 660km discontinuity in the western Ocean Hemisphere (H. Kawakatsu and F. Niu) 2:50 Satoshi Kaneshima (Univ. of Tokyo) Mid-lower mantle scatterers beneath the OHP network (S. Kaneshima and G. Helffrich) 3:10 Michael A.H. Hedlin (IGPP, University of California, San Diego) Defining global average characteristics of small scale mantle heterogeneity using PKP precursors: Evidence for an extreme departure from the global norm deep beneath Tonga. (M. A. H. Hedlin, P. M. Shearer, J. E. Vidale & P. S. Earle) 3:30 Takehiko Yagi (ISSP, University of Tokyo) High Pressure and High Temperature In Situ X-ray Experiments and Their Applications to the Study of the Lower Mantle (T. Yagi, T. Kondo, and K. Oguri) 4:00 Craig R. Bina (Northwestern University) Phase chemistry in the deep mantle (C. R. Bina and R. J. Hemley) 4:20 break 4:30-8:30 Session 23: Poster session: Geodynamics (G01-16) and Seismology (S01-21) (6:30-7:30 "Bento" dinner break) 7:30 Panel discussion Panelists: S.Karato, M.Gurnis, A.Forte, S.Grand, T.Tanimoto, C.Bina, H.Kawakatsu ***Nov. 8 morning*** Session 31: Anisotropy, Mantle convection, D", Plumes (Chairperson: D. Yuen) 8:30 Jean-Paul Montagner (Institut de Physique du Globe) The structure of the Transition Zone (J.-P. Montagner) 9:00 Shun-ichiro Karato (University of Minnesota) Seismic Anisotropy of the Deep Mantle, Boundary Layers and Geometry of Mantle Convection (S. Karato) 9:30 Lev Vinnik (Institute of physics of the Earth) Anisotropic structures in D" (L. Vinnik, L. Breger and B. Romanowicz) 10:00 break 10:15 Raul Valenzuela (Universidad Nacional Autonoma de Mexico) Lateral and radial velocity structure of lowermost mantle from diffracted shear waves. (R. W. Valenzuela and M. E. Wysession) 10:35 Eiichi Takahashi (Tokyo Institute of Technolkogy) Nature of the Mantle Plume : new results of very high pressure experiments (E. Takahashi) 11:05 comment by David Bercovici (University of Hawaii) Mantle plume heads, from bottom to top (D. Bercovici) 11:20 Discussion: Mantle dynamics ================ 12:00 lunch ================ ***Nov. 8 afternoon*** Session 32: Through the Looking-Ocean-Floor: new challenge (Chairperson: H. Kawakatsu) 1:30 Kazunari Nawa (Nagoya University) Incessant excitation of the Earth's free oscillations (Poster S20) (K. Nawa, N. Suda, Y. Fukao, T. Sato, Y. Aoyama, K. Shibuya) 1:40 Toshiro Tanimoto (University of California, Santa Barbara) Excitation of Normal Modes by Atmospheric Turbulence: Source of Long Period Noise (T. Tanimoto) 2:05 Yoshio Fukao (ERI, University fo Tokyo) Seismic coupling between the solid and fluid Earth (Y. Fukao, S. Watada, K. Nawa, N. Suda, N. Kobayashi, K. Nishida) 2:30 Pascal Tarits (Universite de Bretagne Occidentale) Global Induction from Magnetic Satellite and Observatories Data: Role of Seafloor Observatories (P. Tarits) 3:00 Kiyoshi Suyehiro (ORI, University fo Tokyo) Seafloor Borehole Observartories for Global Seismic Network (Suyehiro et al.) 3:30 Panel discussion: New Images of the Earth's Interior Through Long-term Ocean-floor Observations Panelists: K.Suyehiro, Y.Hamano, Y.Fukao, A.Schults, A.Dziewonski, B.Romanowicz ================= End of symmposium ================= === Poster Sessions ======================================================== ----------------------------------------------------------------- Session 13: Poster session: OHP network and seafloor observations ----------------------------------------------------------------- P01 Kiyoshi Suyehiro (ORI, University fo Tokyo) Seafloor Borehole Observartories for Global Seismic Network (Suyehiro et al.) P02 Eiichiro Araki (ORI, Univ. of Tokyo) Development of a compact broadband ocean bottom seismometer. (Araki, H. Nishisaka, M. Shinohara, R. Beauduin, K. Mochizuki, K. Suyehiro) P03 Isao Yamada (Nagoya University) OHP seismic network and its observation system (I. Yamada and Oceanic Island Seismic observation group) P04 Junzo Kasahara (ERI, Univ. of Tokyo) Ocean Bottom Seismic Measurements using Submarine Cables (Kasahara, J., Sato, T., Momma, H. and Shirasaki,Y.) P05 Watada Shingo (ERI, Univ. of Tokyo) OHP data center (S. Tsuboi, S. Watada, Y. Fukao) P06 (Posted in Session 23) Hiromi Fujimoto (ORI, University of Tokyo) Measurements of horizontal and vertical seafloor crustal movements (H. Fujimoto, T. Kanazawa, K. Koizumi, and Y. Osada) P07 Hisashi Utada (ERI, Univ. Tokyo) Geoelectromagnetic component of the Ocean Hemisphere Network (H. Utada, Y. Hamano, and H. Shimizu) P08 Hiroaki Toh (ORI, U. Tokyo) The First Application of an Overhauser Magnetometer to the Absolute Measurement of the Seafloor Geomagnetic Total FOrce and Its Acoustic Link to the Surface (H. Toh and Y. Hamano) P09 Yoshikazu Tanaka (BGRL, U. Kyoto) Electric Field Observations with the sea bottom communication cables near Kyushu Island, Japan (Y. Tanaka, M. Shimoizumi, S. Ooba, H. Utada and Y. Hamano) P10 Kiyoshi Baba (Chiba University) Conductivity Structure in Northeast Pacific 25N,138W (K. Baba, N. Seama, A. D. Chave, J. H. Filloux) P11 Tadanori Goto (ERI, Univ. of Tokyo) On the mantle electrical conductivity beneath Western Pacific constrained by onland and submarine cable measurements (T. Goto, H. Shimizu and H. Utada) P12 Hisayoshi Shimizu (ERI, University of Tokyo) On the distribution of OHP magnetic stations for better modeling of global geomagnetic field (H. Shimizu and H. Utada) P13 Kiyohumi Yumoto (Kyusyu Unversity) Circum-pan Pacific Magnetometer Network Project (Yumoto, K., M. Seto and the CPMN project) P14 Tadahiro Sato (National Astronomical Observatory) A superconducting gravimeter network, GGP-Japan Network (GGP-Japan Group) P15 Daisuke Suetsugu (IISEE/Building Research Institute) SPANET -South Pacific Broadband Seismic Network- (D. Suetsugu and S. Kamiya) P16 Barbara Romanowicz (Univ. of California at Berkeley) MOISE (Monterey bay Ocean bottom International Seismic Experiment) (D. Stakes, B, Romanowicz, J-P. Montagner, P Tarits) P17 Yukari (Nakasa) Kido (Japan Marine Science & Technology Center (JAMSTEC)) Introduction of Oceanic Crust Dynamics Research Frontier Study (Y. (N.) Kido & Oceanic Crust Dynamics Research Frontier Group) P18 Hideaki Machiyama (JAMSTEC) Outline of a analysis system of Long-term deep seafloor observatory off Cape Muroto (H. Machiyama et al.) P19 Yuichi Morita (ERI) OHMS (Ocean Hemisphere project, Mobile Seismic observation system) (Y. Morita) P20 Tomoki Watanabe (ERI) Electric Corrosion Test for Weight Releaser Aiming Long Time Pop-up Type Ocean-bottom Observation (T. Watanabe and T. Kanazawa) P21 Masashi Mochizuki (ERI) Development of Ocean Bottom Seismometer for Long-term Broadband Observation (M. Mochizuki, T. Watanabe, T. Kanazawa) ----------------------------------------------------------------- Session 23: Poster session: Geodynamics and Seismology ----------------------------------------------------------------- =========== Geodynamics =========== G01 Masao Nakanishi (ORI, Univ of Tokyo) Reconstruction of Western Pacific Subduction Zones: Estimating Paleo-position of Trenches and Age of Subducted Plates (M. Nakanishi and K. Tamaki) G02 Yasushi Harada (University of Tokyo) Global Event at around 40Ma seen from Global Motions of Plates relative to Hotspots (Y. Harada) G03 Yoshiki Hamahata (Tohoku Univ.) Molecular Dynamics (MD) estimation of the temperature anomaly in the lower mantle (Y. Hamahata, E. Ohtani, K. Kawamura) G04 Daisuke Yamazaki (Univ. Tokyo) Silicon Self-Diffusion in Perovskite at High Pressure (D. Yamazaki, T. Kato, H. Yurimoto, E. Ohtani and M. Toriumi) G05 Kenji Mibe (ERI, U Tokyo) Connectivity of Aqueous Fluid in the Upper Mantle (K. Mibe, T. Fujii and A. Yasuda) G06 Masaki Ogawa (University of Tokyo at Komaba) The thermo-chemical regime of the early mantle inferred from numerical models of coupled magmatism-mantle convection system with the solid-solid phase transitions at depths around 660 km (M. Ogawa and H. Nakamura) G07 Takashi Nakagawa (University of Tokyo) Basic Study on Numerical Simulation of the Planetary Cooling Process: a Dynamical Model (T. Nakagawa, T. Yanagisawa and Y. Hamano) G08 Atsuko Namiki (Univ. of Tokyo) What controls the convection pattern at heigh Rayleigh number? (A. Namiki and K. Kurita) G09 Ichiro Kumagai (Univ. of Tokyo) The fate of the entrained material in the starting mantle plume (I. Kumagai and K. Kurita) G10 Satoshi Hirano (JAMSTEC) Constraints on Subduction Deformation from Numerical Modeling and Seafloor Observations (S. Hirano, P. R. Cummins, H. Machiyama, Y. Kaneda and Y. Kono) G11 Tomoeki Nakakuki (Univ. of Hiroshima) Dynamical models of subduction: structure and stability (T. Nakakuki and S. Honda) G12 Satoru Honda (Univ. Hiroshima) Heat Transfer by mantle convection (S. Honda, Y. Iwase, T. Nakakuki) G13 Motoyuki Kido (ORI, U tokyo) Synthetic tests of the geodynamical inversion of mantle viscosity (M. Kido and S. Honda) G14 David A. Yuen (Univ. Minnesota, Twin Cities) The Role of non-Newtonian Rheology in the Dynamics of the Upper Mantle (D. A. Yuen, T. Larsen, A. Ten) G15 Mamoru Kato (Kyoto Univ.) Numerical Modeling of Convection in a Stratified Upper Mantle: Early Results (M. Kato) G16 Takatoshi Yanagisawa (University of Tokyo) The Depth-dependent Skewness of S-wave Velocity Deviation Estimated from Global Mantle Tomography (T. Yanagisawa and Y. Hamano) ========== Seismology ========== S01 Heiner Igel (Cambrigde Univ.) Modeling Wave Propagation in 3-D Spherical Sections by the Chebyshev Spectral Method (H. Igel) S02 Nozomu Takeuchi (Univ. of Tokyo) Computation of synthetic seismograms for 3-D heterogeneous Earth models using modified DSM operators (N Takeuchi, P Cummins & R J. Geller) S03 Robert J. Geller (Tokyo University) Optimally accurate numerical schemes for computing synthetic seismograms (R.J. Geller, N. Takeuchi, H. Mizutani) S06 Hiromitsu Mizutani (Tokyo University) Modified Operators for Calculation of Synthetic Seismograms using the Pseudo-spectral Method (H. Mizutani, R.J. Geller, N. Takeuchi) S04 Tatsuhiko Hara (IISEE, BRI) Simultaneous iterative linearized waveform inversion for 3-D earth structure and earthquake source parameters (T. Hara) S05 Kazunori Yoshizawa (Hiroshima University) Higher-order heterogeneities in the upper mantle inferred from Rayleigh-wave polarization data (K. Yoshizawa, K. Yomogida, S. Tsuboi) S07 Yasuyuki Nakamura (Disaster Prevention Research Institute, Kyoto University) Three dimensional S wave velocity structure of the upper mantle beneath the Philippine Sea region (Y. Nakamura and T. Shibutani) S08 Reiji Kobayashi (Kyoto University) Quasi-Love waves caused by lateral heterogeneity (R. Kobayashi) S09 Sri Widiyantoro (Bandung Institute of Technology) Subduction Zone Structure in the Western Pacific Inferred from Tomographic Imaging (S. Widiyantoro and R.D. van der Hilst) S10 Fumiko Tajima (Univ. of Texas at Austin) Characteristics of the upper mantle transition zone anomalies associated with subduction zones in the northwestern Pacific (F. Tajima and S. P. Grand) S11 Fenglin Niu (ERI, University of Tokyo) Global Determination of the Mantle Discontinuities Using Discontinuity Response Function (F. Niu and H. Kawakatsu) S12 Takashi Iidaka (ERI, U Tokyo) Evidence for an anisotropic lower mantle beneath the eastern Asia (T. Iidaka, F. Niu) S13 Raul Valenzuela (Universidad Nacional Autonoma de Mexico) Lateral and radial velocity structure of lowermost mantle from diffracted shear waves. (R. W. Valenzuela and M. E. Wysession) S14 Muneyoshi Furumoto (Kanazawa Univ.) Possibility of a rapid temporal change of seismic anisotropy in the lowermost mantle (M. Furumoto and S. Muraoka) S15 David Sharrock (University of Oxford) Constraining Differential Inner Core Rotation from Splitting of Free Oscillations (D. S. Sharrock and J. H. Woodhouse) S15 David Sharrock (University of Oxford) Frequency characteristics of PKP(BC) and PKP(DF) recorded across the United Kingdom (D. S. Sharrock, D. Bowers and D. A. McCormack) S16 Atsuki Kubo (National Institute of Polar Research) Systematic deviation of earthquake slip vectors from predictions by NUVEL1 model at circum Antarctic plate boundaries (A. Kubo, Y. Nogi, and K. Kaminuma) S17 Masayuki Obayashi (ERI) Comparison of recent tomographic models, (M. Obayashi, T. Sakurai, Y. Fukao) S18 Shin'ichiro Kamiya (Nat'l Res. Inst. for Earth science and Disaster prevention) Detection of Serpentinized Wedge Mantle (S. Kamiya and Y. Kobayashi) S19 Walter D. Mooney (USGS) A New Image of Continental Roots Based on Crustal Isostasy: An Interpretation Constrained by Data from Global Tomography and Mantle Kimberlites (W. Mooney and J. Vidale) S20 Kazunari Nawa (Nagoya University) Incessant excitation of the Earth's free oscillations (K. Nawa, N. Suda, Y. Fukao, T. Sato, Y. Aoyama and K. Shibuya) S21 Hisashi Utada (ERI, Univ. of Tokyo) Possible attenuation of electric field from the core through D'' layer (H. Utada, T. Koyama, and H. Shimizu)