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Three-Dimensional Geophysical Mapping: Providing New Constraints for Understanding Hydrogeological and Geological Processes

English title Three-Dimensional Geophysical Mapping: Providing New Constraints for Understanding Hydrogeological and Geological Processes
Applicant Green Alan G.
Number 117513
Funding scheme Project funding
Research institution Institut für Geophysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Geophysics
Start/End 01.10.2007 - 30.09.2009
Approved amount 744'318.00
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Keywords (18)

georadar; seismic reflection; seismic regraction; geoelectric; electromagnetic; self potential; natural hazards; active faults; paleoseismology; hydrogeophysics; reflection seismology; ground-penetrating radar; high-resolution seismic reflection; New Zealand; data inversion; forward and inverse modelling of geophysical data; high-resolution reflection seismology; active faults in New Zealand

Lay Summary (English)

Lead
Lay summary
During the period October 2008 through to September 2009, we continued to published important papers on the forward modelling and inversion of diverse types of geophysical data. Through a series of synthetic and field examples, we discovered that water within a borehole has a much greater effect on electrical resistivity measurements than previously known; we have suggested a lengthy but effective method to accommodate the effects of water-filled boreholes on crosshole and surface-to-hole geoelectric investigations. As part of the RECORD project along the shore of the River Thur in northern Switzerland, we have managed for the first time to jointly invert three crosshole geophysical (seismic, ground-penetrating radar and geoelectrical) data sets in three dimensions. The data were recorded across 6 planes defined by 4 boreholes at the corners of a 5 x 5 m square. We are in the final write-up phase of our geophysical investigations of seismically active faults in New Zealand. We have produced the first ever shallow (upper 1 km) three-dimensional image of a plate boundary fault (the Alpine Fault on the South Island). The reviewer of one paper states "The authors present some .... stunning seismic images from a high-resolution seismic section acquired across the Alpine Fault". Our seismic study of the Canterbury Plains has produced high-resolution images of the basement and overlying layered Cretaceous- to Quaternary-age supracrustal rocks that have been complexly faulted and folded. At one location, the uppermost Late Pleistocene layers appear to have been gently buckled, indicating that this region continues to be tectonically active.During 2009, the post-doctoral researchers and PhD students supported by this SNF project had 23 papers that were either published, accepted for publication or submitted for publication in first-class international journals and conference proceedings volumes. A further 18 papers were co-authored by the applicants.
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
109052 Three-Dimensional Geophysical Mapping: Providing New Constraints for Understanding Hydrogeological and Geological Processes 01.10.2005 Project funding
126981 Three-Dimensional Geophysical Mapping: Providing New Constraints for Understanding Hydrogeogical and Geological Processes 01.10.2009 Project funding

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