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This lecture covers the fundamental concepts of Earthquake and Seismology, with special focus on the Mechanism of Earthquake and the concept of the Epicentre and Hypocentre. To understand earthquakes properly, it is essential to connect them with the Internal Structure of the Earth including the crust, mantle, core, lithosphere, and asthenosphere because seismic activity originates due to movements within these internal layers. In this session, the following key topics are explained in a clear and conceptual manner: • Meaning of Earthquake and Seismology • Hypocentre (Focus) and Epicentre • Foreshock, Mainshock, Aftershock • P-Waves and S-Waves (Body Waves) • Surface Waves (Love & Rayleigh Waves) • Isoseismic Lines • Richter Scale (Magnitude) • Modified Mercalli Scale (Intensity) • Release of Energy and Elastic Rebound Theory (conceptual understanding) Why This Topic Is Important for Exams: ✔ Frequently asked in UPSC, State PCS, UGC-NET, and other competitive exams ✔ Conceptual questions on seismic waves and shadow zones ✔ Difference between Magnitude and Intensity ✔ Diagram-based questions (Epicentre, Focus, Wave propagation) ✔ Link between Plate Tectonics and Earthquake occurrence ✔ Short notes and 5–10 mark descriptive answers Understanding this topic also builds a strong foundation for related chapters like Volcanoes, Plate Tectonics, and Internal Structure of the Earth. #geography #netjrf #education #science #geographyexam #upsc