General Information

SEDI is headed by a Chair, a Vice Chair and a Secretary General and guided by an Executive Committee. The officers are chosen at open business meetings held at the quadrennial IUGG General Assemblies. The terms of these three offices is for four years, with the current term running from 1 September, 2019, through 31 August, 2023.

Current officers

Executive committee

Name Country
James Badro France
Philippe Cardin France
Ulrich R. Christensen Germany
Cathy Constable USA
Renaud Deguen France
Arwen Deuss Netherland
Matthieu Dumberry Canada
Tim Elliott UK
Rafael Garcia France
Ed Garnero USA
Yumei He China
George Helffrich Japan
Richard Holme UK
Gauthier Hulot France
Dominique Jault France
Catherine Johnson Canada
Chris Jones UK
Stephane Labrosse France
Thorne Lay USA
Guy Masters USA
Yongxin Pan China
Sebastian Rost UK
Hisa Shimizu Japan
Sabine Stanley Canada
Paul Tackley Switzerland
Satoru Tanaka (Past Chair) Japan
Hrvoje Tkalcic Australia
James Wookey UK
Jon Aurnou (Past Chair) USA


Since 1987, SEDI has been an Union Committee of the International Union of Geodesy and Geophysics (IUGG). As such, it cuts across the traditional discipline-oriented bounds of the Associations of the (IUGG) [such as the International Association of Geodesy ( IAG), the International Association of Geomagnetism and Aeronomy (IAGA), the International Association of Seismology and Physics of the Earth's Interior (IASPEI), and the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI)] which normally study the Earth from a particular point of view. The intent of SEDI is to amalgamate all sources of data and all points of view to generate the most coherent and consistent picture of the workings of the Earth's deep interior.

Business meetings

Business meetings of SEDI are held at the SEDI Symposium and the IUGG General Assembly. At these meetings, which are open to all interested participants, reports of SEDI-related scientific activities are presented and decisions are made concerning projects to endorse or scientific symposia to be organized.


Membership in SEDI is informal; it is sufficient to send an email message, containing your name and address and an expression of interest to become a member of SEDI, to the secretary at or SEDI presently has about 550 members. The secretary of SEDI maintains an email list for the purpose of scientific exchange only.