GEOL 106 Lecture Notes - Lecture 2: Igneous Rock, Seismogram, Isostasy
23 Mar 2018
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Document Summary
Earth"s internal structure: earth is divided into three major layers, crust- earth"s thin, rocky outer skin, mantle- approx. 2900 km thick and composed of peridotite (fe, mg silicates: core- is composed of iron (ni, co, s, most of our knowledge of earth"s interior comes from the study of seismic waves. Information also comes from: meteorites, density calculations, heat flow, high pressure experiments. 7kms tick and composed of basalt (fe, mg & al rich rock: continental crust- 30 to 70 km and composed primarily of granite (si rich rock) Interior layers of the earth based on composition. Complex rocks- overall granitic (al, silicates with na, ca, mg, fe. Interior layers of the earth based on physical properties. Seismology: the study of earthquakes and of seismic waves as they pass through the earth. Focus- source of energy release: epicenter- on the surface directly above the focus.
