"Develop a comprehensive urban infrastructure plan for a rapidly expanding city in a seismically active region. Consider population growth projections, seismic resilience, environmental sustainability, resource efficiency, community engagement, and long$-$term planning. Integrate advanced engineering techniques for seismic resilience, incorporate sustainable design principles, optimize resource utilization, and engage stakeholders for inclusive decision$-$making. Emphasize flexibility, adaptability, and risk management to ensure the long$-$term viability and resilience of the city's infrastructure network."