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New Developments of efficient geophysical tomography algorithms for exploring near-surface structures

English title New Developments of efficient geophysical tomography algorithms for exploring near-surface structures
Applicant Maurer Hansruedi
Number 121707
Funding scheme Project funding
Research institution Institut für Geophysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Geophysics
Start/End 01.11.2008 - 31.10.2010
Approved amount 129'053.00
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Keywords (4)

Seismics; Geoeletrics; Wavelets; Geoelectrics

Lay Summary (English)

Lead
Lay summary
New tomographic inversion algorithms for three-dimensional (3D) imaging of the shallow subsurface will be developed. Based on novel adaptive wavelet techniques numerical modeling and inversion algorithms will be established that are suitable for 3D geoelectrical and seismic problems. These techniques are most useful to solve urgent problems associated with important issues, such as natural hazards, disposal of dangerous waste, groundwater and construction of major buildings and tunnels. An important feature of adaptive wavelet schemes is that they solve the forward and inversion problems in an iterative fashion. The first few iterations can be computed very swiftly and require only small amounts of computer memory. Nevertheless, they are expected to provide a good approximation of the true subsurface structures. With additional iterations the tomographic images can be refined at progressively increasing costs. This attractive property will allow approximate 3D geoelectrical tomograms to be computed directly in the field, which could, for example, be exploited for real-time experimental design. Furthermore, they make the extremely challenging 3D seismic waveform inversion problem tractable, at least in an approximate form. To improve the reliability of the tomographic images, joint inversion schemes will be established that consider the representation of geoelectrical and seismic data and model parameters in terms of wavelets. In analogy to ongoing research on statistical experimental design for geoelectrical data, new strategies for determining optimized seismic experiments will be devised as well. Benefits from all these new developments will be demonstrated with inversions of coincident 3D geoelectrical/seismic field data sets that will be collected in the framework of this project.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

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Associated projects

Number Title Start Funding scheme
111846 New Developments of efficient geophysical tomography algortithms for exploring near-surface structures 01.11.2006 Project funding
132745 New Developments of efficient geophysical tomography algortithms for exploring near-surface structures 01.05.2011 Project funding

Abstract

New tomographic inversion algorithms for three-dimensional (3D) imaging of the shallow subsurface will be developed. Based on a novel adaptive-wavelet technique, numerical modeling and inversion algorithms that are suitable for 3D geoelectrical and seismic problems will be established. The geoelectrical and seismic techniques are useful for solving problems associated with such important issues as natural hazards, disposal of dangerous waste, groundwater, and construction of major buildings and tunnels. A key feature of adaptive-wavelet schemes is that they solve the forward and inversion problems in an iterative fashion. The first few iterations can be computed very swiftly and require only small amounts of computer memory. Nevertheless, they are expected to provide good approximations of the true subsurface structures. With additional iterations, the tomographic images can be refined at progressively increasing costs. This attractive property should allow approximate 3D geoelectrical tomograms to be computed directly in the field, which could, for example, be exploited in real-time experimental design. Furthermore, they should make the extremely challenging 3D seismic waveform inversion problem tractable, at least in a good approximate form. To improve the reliability of the tomographic images, joint inversion schemes will be established that consider the representation of geoelectrical and seismic data and model parameters in terms of wavelets. By analogy with ongoing research on statistical experimental design for geoelectrical data, new strategies for determining optimized seismic experiments will be devised as well. Benefits from all these developments will be demonstrated with inversions of coincident 3D geoelectrical/seismic field data sets to be collected in the framework of this project.
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