There are several study materials and resources available for earthquake engineering concepts in the civil engineering optional subject. These resources can help students understand the principles and applications of earthquake engineering and prepare for their exams effectively. Below are some of the key study materials and resources for earthquake engineering concepts in civil engineering:

1. Textbooks: There are various textbooks available that cover earthquake engineering concepts comprehensively. Some popular textbooks include:
- "Earthquake Engineering: From Engineering Seismology to Optimal Design" by Yousef Bozorgnia and Vitelmo Bertero.
- "Fundamentals of Earthquake Engineering" by Amr S. Elnashai and Luigi Di Sarno.
- "Earthquake Engineering: Theory and Implementation" by N. N. Basak.

2. Lecture Notes: Many universities and educational institutions provide lecture notes on earthquake engineering. These notes offer detailed explanations of various topics and can be a valuable resource for students. Students can access these lecture notes online or through university libraries.

3. Research Papers: Reading research papers can provide in-depth knowledge and insights into specific areas of earthquake engineering. Students can access research papers through online databases, such as IEEE Xplore, ScienceDirect, or Google Scholar, by searching for relevant keywords.

4. Online Courses and Tutorials: Several online platforms offer courses and tutorials on earthquake engineering. These courses are designed to provide a comprehensive understanding of the subject and often include video lectures, quizzes, and assignments. Websites like EduRev offer courses specifically tailored for civil engineering optional subjects.

5. Seismic Design Codes and Guidelines: Familiarizing yourself with seismic design codes and guidelines is crucial for earthquake engineering. Codes such as the International Building Code (IBC) or the Eurocode provide regulations and recommendations for designing structures to withstand seismic forces. Students can access these codes and guidelines through official websites or libraries.

6. Practice Questions and Mock Tests: Solving practice questions and taking mock tests can help students assess their knowledge and identify areas that need further improvement. Websites like EduRev offer a wide range of practice questions and mock tests for civil engineering optional subjects.

Remember, it is essential to study from reliable and authoritative sources to ensure accurate and up-to-date information.