(repeat) NSN | Earthquakes in the Midwest

Three massive earthquakes struck the American Midwest in 1811-12. Could it happen again? Watch NOVA every Wednesday night on PBS. Or join us online at pbs.org/nova. NOVA is produced by WGBH in Boston. Funding for NOVA scienceNOW is provided by the National Science Foundation, the Howard Hughes Medical Institute, and the Alfred P. Sloan Foundation, and PBS viewers. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, the Lockheed Martin Corporation, and PBS viewers. This material is based upon work supported by the National Science Foundation under Grant No. 0407101. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.