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Selected Research Projects
Research Projects:
- Geophysical parameterization and interpolation of irregular data
using natural neighbours.
Malcolm Sambridge, in collaboration with Jean Braun and Herbert McQueen of the
geodynamics group,
have developed an approach for interpolating a property of the
Earth (e.g. temperature, or seismic velocity) specified at a series of
arbitrarily distributed `reference' points in two or three dimensions.
The method makes use of some powerful algorithms from the field of
computational geometry and is applicable to a wide range of
problems including numerical modelling and building complex
parameterizations in 3-D.
A Web page for this project can be reached by clicking
here.
- Neighbourhood Algorithm
The Neighbourhood algorithm, a general Monte Carlo
method for non-linear inversion has been developed at RSES. The web page contains
a description of the method and its application to the inversion of
receiver functions for crustal seismic structure. Also access is provided
to postscript versions of related papers, other related
www pages and information on how to obtained the software.
Click here .
Application of the NA algorithm for different problems:
- Inversion for Regionalised Upper Mantle models: -
The RUM model.
Oli Gudmundsson and Malcolm Sambridge have performed a series of
inversions of global travel time data for a
regionalised seismic model (RUM)
of the upper mantle. This work also provides geometrical descriptions of the
major subduction zones
- Seismic Tomography.
The group is involved in travel-time tomography at both
regional
and global scales for both P and S waves particularly
in joint inversions for bulk-sound
speed and shear wavespeed for the whole mantle.
The web pages currently provide access to images. Models
can be made available on request to
Brian Kennett.
On a regional scale there is an major effort to map 3-D shear wavespeed
structure beneath the Australian region using waveform tomography for
surface waves. A summary of results from the Skippy experiment can be found
by clicking here.
Current work focusses on inversion for both
shear wavespeed and anisotropy
- Seismic Wave Propagation.
Body wave synthetics
Surface waves in 3-D media
Questions about the topics in this Report to
Brian Kennett: Brian.Kennett@.anu.edu.au
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