American Geophysical Union
Phone: 202.462.6900, 800.966.2481 (North America only)
Fax: 202.328.0566
E-mail: service@agu.org
http://www.agu.org
Select "Science and Society" from side menu, and then select "Careers in Science" to get a list of Ph.D. institutions.

American Geological Institute
Phone: 703.379.2480
Fax: 703.379.7563
E-mail: aeb@agiweb.org
http://www.agiweb.org
Select "Geoscience Careers" from side menu, then select "Guide to Geoscience Departments."

Environmental and Engineering Geophysical Society
Phone: 303.531.7517
Fax: 303.820.3844
E-mail: staff@eegs.org
http://www.eegs.org/
Select "What is Geophysics?"

Society of Exploration Geophysicists
Phone: 918.497.5554
http://www.seg.org/
Under "You & Geophysics" on the right menu bar, select "What is Geophysics" or "Students."