1989 Loma Prieta earthquake larger loss of life, as several of the Bay Area's major transportation structures suffered catastrophic failures. The collapse of a section of the double-deck Nimitz Freeway in Oakland was the site of the largest number of casualties for the event, but the collapse of man-made structures and other related accidents contributed to casualties occurring in San Francisco, Los Altos, and Santa Cruz. The history of earthquake investigations in California has been largely focused on the San Andreas Fault System, due to its strong influence in the state as the boundary between the Pacific Plate and the North American Plate; it
San Francisco Opera which followed. One of Mansouri's triumphs was the overseeing of the reconstruction and renovation of the opera house following the October 1989 earthquake. After closing at the end of the 1995 Fall season for "a 21-month, US$88.5 million renovation, San Francisco's War Memorial Opera House reopened on 5 September 1997 with a gala concert celebrating this occasion, as well the 75th anniversary of the San Francisco Opera. Fittingly, the concert featured operatic greats of the past, present and future. The project included repairs of damage caused by the 1989 Loma Prieta earthquake, improvements for the audience and performers, seismic strengthening