This episode's headline: Earthquake. The guests include ROBERT WESSON, U.S. Geological Survey; JAMEEL AHMAD, Structural Engineer; FREDERICK KRIMGOLD, Architect; GRANT PETERSON, Federal Emergency Management Agency; CORRESPONDENTS: SPENCER MICHELS; ELIZABETH BRACKETT; KWAME HOLMAN. Byline: In New York: ROBERT MacNeil; In Washington: JUDY WOODRUFF