1989 Loma Prieta earthquake earthquake precursor, more recent studies have cast doubt on the connection, attributing the Corralitos signals to either unrelated magnetic disturbance or, even more simply, to sensor-system malfunction. The earthquake caused severe damage in some very specific locations in the San Francisco Bay Area, most notably on unstable soil in San Francisco and Oakland. Oakland City Hall was evacuated after the earthquake until a US$80M seismic retrofit and hazard abatement work was completed in 1995. Many other communities sustained severe damage throughout the region located in Alameda, San Mateo, Santa Clara, San Benito, Santa Cruz and Monterey counties. Major property damage
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