This book is presented in two volumes, focusing on the classic Lamb's problem in seismology. It provides a systematic discussion on the relative foundational theories of seismology and two approaches to solving Lamb's problem. The second volume (Vol. 2) thoroughly explores time-domain solutions using the Cagniard-de Hoop method. It begins with closed-form solutions for two-dimensional issues, advancing to integral solutions and detailed analyses of three kinds of Lamb's problems and their extensions in three dimensions, culminating in generalized closed-form solutions in time domain. The book aims to provide a clear and detailed explanation of theories and methods, making it accessible for self-study. It serves as a valuable reference for upper-level undergraduate and graduate students in geophysics, as well as university faculty and researchers in related fields.