Seismics; adpative methods; Wavelets; Geophysics; Modelling
Ren Zhengyong, Kalscheuer Thomas, Greenhalgh Stewart Alan, Maurer Hansruedi R. (2014), A hybrid boundary element-finite element approach to modeling plane wave 3D electromagnetic induction responses in the Earth, in Journal of Computational Physics
, 258, 705-717.
Auer Ludwig, Nuber Andre Marc, Greenhalgh Stewart Alan, Maurer Hansruedi, Marelli Stefano (2013), A critical appraisal of asymptotic 3D-to-2D data transformation in full-waveform seismic crosshole tomography, in GEOPHYSICS
, 78(6), 235-247.
Ren Zhengyong, Kalscheuer Thomas, Greenhalgh Stewart Alan, Maurer Hansruedi R. (2013), A goal-oriented adaptive finite-element approach for plane wave 3-D electromagnetic modelling, in Geophysical Journal International
, 194(2), 700-718.
Ren Zhengyong, Kalscheuer Thomas, Greenhalgh Stewart Alan, Maurer Hansruedi R. (2013), Boundary element solutions for broad-band 3-D geo-electromagnetic problems accelerated by an adaptive multilevel fast multipole method, in Geophysical Journal International
, 192(2), 473-499.
Ren Zhengyong, Kalscheuer Thomas, Greenhalgh Stewart, Maurer Hansruedi (2013), Boundary element solutions for broad-band 3-D geo-electromagnetic problems accelerated by an adaptive multilevel fast multipole method, in GEOPHYSICAL JOURNAL INTERNATIONAL
, 192(2), 473-499.
Dalban Canassy Pierre, Walter Fabian, Husen Stephan, Maurer H., Faillettaz Jérôme, Farinotti Daniel (2013), Investigating the dynamics of an alpine glacier using probabilistic icequake locations: Triftgletscher, switzerland, in Journal of Geophysical Research F: Earth Surface
, 118(4), 2003-2018.
Zhou B, Greenhalgh S, Maurer H (2012), 2.5-D frequency-domain seismic wave modeling in heterogeneous, anisotropic media using a Gaussian quadrature grid technique, in COMPUTERS & GEOSCIENCES
, 39, 18-33.
Plattner A, Maurer HR, Vorloeper J, Blome M (2012), 3-D electrical resistivity tomography using adaptive wavelet parameter grids, in GEOPHYSICAL JOURNAL INTERNATIONAL
, 189(1), 317-330.
Manukyan E, Latzel S, Maurer H, Marelli S, Greenhalgh SA (2012), Exploitation of data-information content in elastic-waveform inversions, in GEOPHYSICS
, 77(2), 105-115.
Meles GA, Greenhalgh SA, Green AG, Maurer H, Van der Kruk J (2012), GPR Full-Waveform Sensitivity and Resolution Analysis Using an FDTD Adjoint Method, in IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
, 50(5), 1881-1896.
Maurer H, Greenhalgh SA, Manukyan E, Marelli S, Green AG (2012), Receiver-coupling effects in seismic waveform inversions, in GEOPHYSICS
, 77(1), 57-63.
Manukyan E, Maurer H, Marelli S, Greenhalgh SA, Green AG (2012), Seismic monitoring of radioactive waste repositories, in Geophysics
, 77(6), EN73-EN83.
Marelli S., Maurer H.R., Manukyan E. (2012), Validity of the acoustic approximation in full-waveform seismic crosshole tomography, in Geophysics
, 77(3), R129-R139.
Hauck C, Bottcher M, Maurer H (2011), A new model for estimating subsurface ice content based on combined electrical and seismic data sets, in CRYOSPHERE
, 5(2), 453-468.
Inverting complete waveforms of seismic data has the potential to significantly increase our knowledge about the interior of the earth, including the uppermost 100 m, which are of vital interest for numerous problems of high societal relevance (e.g., groundwater resources, storage of dangerous waste, natural hazards and major building projects). However, the large computational expenses together with problematic system effects, such as the generally unknown source characteristics and variable receiver coupling, have precluded application of this potentially very powerful technique on a routine basis. Building on the latest developments in the applicant’s research group in the areas of numerical modelling, inversion technology and experimental design, novel waveform inversion algorithms and data acquisition strategies will be developed. The project involves two subprojects: one devoted to numerical forward modelling (project A) and one devoted to inversion technology and experimental design problems (project B). In project A, an adaptive-wavelet modelling technique, which we originally developed for 3D geoelectrical problems, will be significantly modified such that the frequency-domain acoustic response of a 2D model can be computed. The performance of this algorithm will be compared with state-of-the-art adaptive finite-element modelling codes. Based on these comparisons, the most suitable of the two techniques will be further developed and adapted to tackle visco-acoustic, elastic, visco-elastic and ground penetrating radar (GPR) problems. Particular emphasis will be put on exploiting common features of the different problems. For example, the GPR problem is formally equivalent to the visco-acoustic case. Likewise, the equations of motion that describe the (visco)-elastic problems can be decomposed into Helmholtz-type scalar equations, on which (visco-)acoustic modelling is based. By sharing as many common elements as possible in the modelling codes, it should be more straightforward to apply further developments, such as 2.5D modelling, simultaneously to all types of problems. In project B, optimised inversion model parameterisations will be investigated. Again, this task will benefit from previous research on geoelectrical problems conducted in the applicant’s research group. Moreover, critical issues of waveform inversions, such as pronounced non-linearities and systematic effects caused by variable receiver coupling, will be studied and appropriate strategies to account for these problems will be devised. In a second phase of project B, statistical experimental design will be used to determine optimised field layouts for seismic and GPR waveform inversion experiments. In addition, an information content analysis will help identify particularly important (i.e., information-rich) portions of the seismic and GPR waveforms. The new algorithms developed for projects A and B will be tested on comprehensive 3D seismic and GPR data sets to be acquired and analysed as components of this application.