Paul Richards, Earth Institute at Columbia University (image)

Caption
Paul Richards, a seismologist at Lamont-Doherty Earth Observatory, discusses the greatly expanded capabilities of instruments able to detect clandestine nuclear tests.
Credit
Courtesy Comprehensive Test Ban Treaty Organization
Usage Restrictions
Use this image to link to the video on YouTube: http://www.youtube.com/watch?v=RpyF5T6W-Z0