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EARTH PHYSICS Research School of Earth Sciences

EARTH PHYSICS Research School of Earth Sciences. RSES - Earth Physics. Geodynamics CADI Geophysical Fluid Dynamics Seismology ANSIR. Earth Physics - Scientific Themes. ■ Lithosphere studies (Seismology & E/M) ■ Deep Earth Structure and processes ■ Geodynamic Modelling

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EARTH PHYSICS Research School of Earth Sciences

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  1. EARTH PHYSICS Research School of Earth Sciences

  2. RSES - Earth Physics Geodynamics CADI Geophysical Fluid Dynamics Seismology ANSIR

  3. Earth Physics - Scientific Themes ■Lithosphere studies (Seismology & E/M) ■Deep Earth Structure and processes ■Geodynamic Modelling ■Sea level change and response to ice loads ■Geodetic studies of active processes ■Computational Geophysics ■Data Inference ■Ocean Processes ■Volcanic Processes ■Atmospheric Physics

  4. RSES- Earth Physics • Seismology • Studies of the Australian Continent • Seismic Tomography • Structure of the Deep Earth • Antarctic Seismology • Geodynamics • Satellite geodesy • Plate movements in PNG, Antarctica • Sea Level, Ice and Climate

  5. RSES- Earth Physics • Geophysical Fluid Dynamics • Ocean Processes • Physics of Lava Flows • Nature of subduction • Mantle convection • Computational Geophysics • TERRAWULF Parallel Cluster • Geophysical Inverse Problems • Modelling of surface processes

  6. Earth Physics Students: 13 Ph.D. students 2 Honours students Interactions with Other Areas: • Geodynamics - strong links with EE on climate change and sea-level issues • CADI has broad interaction across the School - EM, EC and EE on a variety of problems e.g. Landscape evolution, Inverse methods • Seismology links to EM: - material properties and seismic wavespeeds - interpretation of tomographic images re tectonic evolution

  7. Strands of Seismology Research • Lithosphere and Mantle Structure in Australia and East Antarctica - using multiple techniques • Subduction zone and deep mantle structure • Improved techniques for data analysis and structural recovery

  8. Recent and Current Seismic Data Acquisition

  9. Broad-band experiments

  10. Sources and stations

  11. 3-D Shear structure – ak135 reference

  12. Structural Studies

  13. Subduction Zone Imaging Widiyantoro, Kennett & van der Hilst (1999) EPSL Separate P & S inversions Gorbatov & Kennett (2003) EPSL 3-D ray tracing Nonlinear joint inversion

  14. Earth Sounding Initiative • From 2003 Strategic Planning with additional Central ANU support • Level C/D post (continuing) in Observational Seismology • Level B/C post (5 years) in Crustal Scale Seismology (passive + active) • Aimed to improve links through ANSIR and support National priorities

  15. The reflection equipment in the ANSIR Major National Research Facility was transferred to RSES in July 2002, and as a result Prof B.L.N. Kennett became Director of the MNRF. Operations are supported by a Grant from Geoscience Australia, with an Executive Officer taking main responsibility for oversight of reflection surveys. Innovations since the move include commercial hire of ANSIR vibrators and multi-company experiments in WA.

  16. Future of ANSIR • The contractual arrangements for the ANSIR Major National Research Facility expired at the end of June 2005. • The Owners (GA & ANU) have agreed to maintain capability for seismic imaging across the full range of scales currently supported by ANSIR, as a contribution to the National Research Priorities, for at least two more years • The continuing facility will broaden its scope to include other geophysical sounding techniques e.g. e/m sounding through a current LIEF bid • To reflect the change the “ANSIR” brand has been retained but the description is now altered to: ANSIR – National Research Facility for Earth Sounding

  17. ANSIR – Continental Coverage to 2005

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