$===$ : civil engineers address soil liquefaction challenges in seismic design? Discuss the mechanisms behind soil liquefaction during earthquakes and its potential impact on structures. Explore the methods used to assess liquefaction susceptibility, including soil testing and site characterization techniques. Analyze the design strategies employed to mitigate liquefaction effects, such as ground improvement techniques like compaction grouting, vibro$-$compaction, and soil reinforcement. Furthermore, examine case studies of successful liquefaction mitigation measures implemented in seismic$-$prone regions."