This book is a compilation of selected papers from the 9th International Symposium on Lifeline and Infrastructure Earthquake Engineering (ISLIEE 2024). The work focuses on innovative methodologies and the practical applications of these technologies in the field of Earthquake Engineering, including disaster prevention and mitigation, performance deterioration and service safety, structural diagnosis and treatment, reliability analysis, structural health monitoring (SHM) and disaster resilience of civil engineering infrastructures. Besides the development of basic theoretical knowledges, new numerical and experimental methods, this book illustrates application of these innovative methodologies in practical engineering, in particular, in large-scale civil engineering infrastructures. Gathering the newest development, the contents make valuable contributions to academic researchers and engineers in the industry. As well, readers will encounter new ideas for realizing a more efficient and safer system.