EESA01H3 Lecture Notes - Lecture 3: Oceanic Crust, Inner Core, Continental Crust
Document Summary
Earthquakes tell is of the earth"s deep interior focus: describes where the earthquake occurs. Faults are movement of separating blocks of the earth"s crust. Largely speed depends on the type of material. Waves can go directly or refracted through a different layer. Refracted waves travel faster to the seismic station. P waves arrive first, then s waves and then surface waves. The surface waves cause damage to the building and anything else on the surface of earth. The more the time lag, the farther away the earthquake focus is. Intracontinental earthquakes occur because of deeply buried faults. These faults are being reactivated as the north american is pushed towards the west. Oceans have mid ocean ridges and seas don"t. Inner part of the core is made out of nickel. Earth is made of inner core, outer core, mantle, crust. Widmannstetter pattern: crystal pattern on rocks produced in the core.
