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Appendix B U.S. Geodynamics Committee: Reportorial Topics and Reporters The U.S. Geodynamics Committee (USGC) was established in 1969 to foster and encourage studies of the dynamic history of the earth, with appropriate attention to both basic science and applications. The USGC also serves as the U.S. national committee for the International Lithosphere Program (ALP). In the 1970s, the U.S. Geodynamics Committee served as the U.S. counterpart to the International Geodynamics Project. The USGC developed recommendations for U.S. participation in the Geodynamics Project, published as U.S. Program for the Geodynam~cs Project: Scope and Objectives (1973~. Three additional major reports were prepared by the USGC more recently: Continental Scientific Drilling Program (1979), Geodynamics in the 1980s (1980) and The Lithosphere: Report of a Workshop (1983~. To implement its recommendations, the USGC established a system of special priority topics and corresponding reporters. The term "reporter" can be misreading. The USGC adopted this word from the usage in international geophysical programs in which it has a connotation of activity and responsibility. The duty of each reporter is to provide recommendations to the USGC regarding steps that could be taken to implement the topic or priority in question. Much of the work of the USGC is based on the activities and recommendations of the reporters and the groups that they have convened. Meetings have ranged from small groups to two major workshops on continental scientific drilling. These activities have led to well-defined results including the following: deep reflection profiling programs; preparation and publication of the plate margins cross sections; the Continental Scientific Drilling Program; and the North American Continent-Ocean Transects Program. 85

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86 The reportorial topics adopted by the USGC are subject to continual review, with additions and phasing out as appropriate. In addition, the USGC has designated USGC-~LP reporters. USGC Reportorial Topics and Reporters Seismic Reflection Profiling Continent-Ocean Transects Geodynamic Data Sedimentary Systems Chemical Geodynamics Internal Processes and Properties Mantle Dynamics Crustal Dynamics Fluids in the Crust Global Seismology Continental Drilling Marine Geology and Geophysics; and Planetology Voicanic Hazards I,arry Brown Robert C. Speed William J. Hinze Peter R. Vail Donald J. DePaolo Raymond JeanIoz Bradford H. Hager Leigh H. Royden Mark D. Barton Stewart W. Smith Mark D. Zoback Sean C. Solomon Grant H. Heiken

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87 USGC-lLP Reporters In recognition of the importance of linkage and interaction between the USGC and the ILP, those U.S. scientists who have major responsibilities on the Inter-Union Commission on the Lithosphere (JCL) are designated as USGC-~LP reporters. L,ithosp}zere Program Topics Working Group (WG) or Coordinating Committee (CC) WG-1 WG-2 .\ WG-3 WG-4 WG-6 Recent Plate Movements and Deformation Nature and Evolution of the Continental Lithosphere Task Group A. Variations in the Nature and Evolution of Mobile Belts Task Group B. Plate Motions and Orogeny through Time Task Group C. Thermal, Mechanical, and Cherrucal Evolution of the Continental Lithosphere Intraplate Phenomena Nature and Evolution of the Oceanic Lithosphere WG-5 Paleoenvironmental Evolution of the Oceans and Atmosphere Structure, Physical Properties, Composition, and Dynamics of the Lithosphere-Asthenosphere System Task Group A. Structure Task Group B. Physical Properties Task Group C. Dynamics Task Group D. Composition CC-1 Environmental Geology and Geophysics CC-2 Mineral and Energy Resources CC-3 Geosciences Within Developing Countries CC-4 Continental Drilling CC-5 Data Centers and Data Exchange CC-6 National Representatives Subcommittee on the Arctic CC-7 Global Geoscience Transects Robert S. Yeats (ch) Christopher R. Scotese (ch TG-B) Gerald Schubert (vc TO-C) Mary Lou Zoback (mb) John C. Mutter (ch) George Kiersch (ch) Mark D. Zoback (ch) Michael A. Chinnery (mb) William J. Hinze (mb) Frank M. Richter (US rep) G. Leonard Johnson (ch) Randall Van Schmus (mb) (and leader, N.Am. sec- tion) John W. Harbaugh (mb) Role on the ICL WG or CC: ch = chairman; vc = vice chairman; mb = member.

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