Earthquakes and Seismology in Earth’s Interior

Methods of Studying Earth's Interior00:00:06

While physical evidence like xenoliths and meteorites provide clues, geologists primarily use seismic waves to map the physical properties and layers of Earth's interior.

Understanding Seismic Waves00:01:26

Seismic waves are produced by earthquakes which result from stress rupture along faults. Surface waves travel along the crust, while body waves (P-waves and S-waves) travel through the interior to provide data on density and composition.

Analyzing Earth's Layers through wave behavior00:05:33

By tracking how P-waves and S-waves travel, reflect, and refract through the planet, scientists identified the liquid nature of the outer core due to the S-wave shadow zone and the density shifts at the core-mantle boundary.

Mapping the Mantle and Core00:06:32

Detailed seismic analysis reveals the Moho boundary, the low-velocity zone separating the lithosphere and asthenosphere, the transition zone, and the complexities of the D'' layer, leading down to the solid inner core.