Civil World on Instagram: "Seismic Wave Propagation to a Site This animation illustrates how seismic energy travels from the focus of an earthquake through different layers of the Earth and reaches a building on the surface. Understanding this process is essential for designing earthquake-resistant structures. ✅ Key Points: Focus is the origin point of the earthquake within the Earth's crust. Epicenter is the point on the surface directly above the focus. Body waves travel through the inner laye