This lecture discusses: elasticity theory, seismic wave propagation, velocity structure, earthquake parameters, earthquake parameter estimation, travel time curves, travel time tomography, earthquakes, CMT, focal mechanisms, identification of fault planes. This lecture can be taken by students who have taken the Earth Physics course. Lectures are carried out using an expository approach in the form of lectures, discussions, presentations, and observations, practicums, workshops equipped with the use of LCDs, computer simulations, as well as an inquiry approach in the context of observation tasks and the use of tools or software related to Seismological Physics.