Download Earth`s internal structure: a seismologist`s view

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Transcript 
Earth’s internal structure:
a seismologist’s view
Types of waves used by
seismologists
Organizing the information
• Seismic travel times
• Dispersion curves
• Free oscillation frequencies
Putting it all together
The crust
Mohorovicic 1909
The
lithosphere
The
asthenosphere
Mineralogical models of the
upper 400 km
• Pyrolite (Ringwood 1975) is a garnet
peridotite mainly of olivine and
orthopyroxene
• Piclogite (Anderson and Bass 1984) is a
clinopyroxene and garnet rich aggregate
with some olivine
The
transition zone
• Characterized by
discontinuities in
velocity and density
models.
• Observed mainly by
SS and PP underside
reflections/
The
lower
mantle
is
relatively
simple,
except
D’’
The discovery of the core
• The core: Oldham 1906. Drop in velocity 
shadow zone in P arrivals  liquid core
• Inner core: Lehman 1936. Increase in
velocity  triplication  solid inner core
• Innermost core: 2003
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