The disaster that had a profound effect on building codes in California was the San Francisco earthquake of 1906. This catastrophic event, which struck on April 18, caused widespread destruction, with estimates of over 3,000 fatalities and 28,000 buildings destroyed. The subsequent fires exacerbated the damage, leading to significant loss of infrastructure and housing. In response to this disaster, California implemented stricter building codes to enhance seismic safety, as the earthquake demonstrated the urgent need for improved engineering standards and urban planning. These reforms laid the groundwork for modern seismic regulations, transforming city construction practices in earthquake-prone areas.