Geophysics, Lecture Notes- Physics - Prof Gavin Bell 11

Geophysics, Lecture Notes- Physics - Prof Gavin Bell 11 -...

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PX266 Geophysics (2010/11) Lecture 10 Handout – Seismology and Earth’s Structure Dr. Gavin Bell Figure: Density and seismic velocities for the whole Earth as a function of depth, followed by elastic moduli and gravitational acceleration as a function of pressure. The pressure increases monotonically with depth to a maximum value at the centre of the Earth of around 360GPa (3.6 million times atmospheric pressure). Since this pressure increase is not linear, the pressure scale on the lower figure is effectively a distorted depth scale. The region where = 0 is the outer core, which does not support shear waves.
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Unformatted text preview: Above: the upper mantle and lithosphere, showing S-wave velocity variation derived from seismic wave travel time inversions. The main (Mg, Fe) silicate minerals are shown, with distinct transitions from olivine to spinel to perovskite being accompanied by changes in S-wave speed. The wave speed drops below the lithosphere in the so-called ‘low velocity zone’ making up the upper asthenosphere. Below: normal modes for the whole Earth Further study Revise the A-W equation with Q. 13....
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This note was uploaded on 09/12/2011 for the course ECON 102 taught by Professor Gavinbell during the Spring '11 term at LSE.

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Geophysics, Lecture Notes- Physics - Prof Gavin Bell 11 -...

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