This course introduces students to earthquakes in aspects related to science, engineering and the society. Science aspects include the origin of earthquakes and their geographical distribution, how they propagate through the earth crust and affect human beings. Engineering and social aspects cover the common methods used for quantifying and monitoring earthquakes, their damage on constructed facilities, preparedness and disaster mitigation strategies. Teaching and learning activities include formal lecture, discussion, experimental demonstration and visit to seismic monitoring facilities at the Hong Kong Observatory. Students from all disciplines are welcome. Students shall pursue a topic of their own interest and background in a group project with presentation, which will allow them to consolidate the materials learnt in the course for learning development in their own discipline of focus.