| Title | Improved analysis of horizontal-to-vertical spectral ratio measurements for groundwater investigations |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Dietiker, B ;
Hunter, J A; Pugin, A J -M |
| Source | Southern Ontario groundwater project 2014-2019: summary report; by Russell, H A J (ed.); Kjarsgaard, B A (ed.); Geological Survey of Canada, Open File 8536, 2020 p. 159-170, https://doi.org/10.4095/321101
 Open Access |
| Year | 2020 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Southern Ontario
groundwater project 2014-2019: summary report |
| File format | pdf |
| Province | Ontario |
| NTS | 31F/09; 31G/05; 31G/06 |
| Area | Ottawa; Ottawa River |
| Lat/Long WENS | -76.5000 -75.0000 45.7500 45.2500 |
| Subjects | hydrogeology; surficial geology/geomorphology; stratigraphy; geophysics; Nature and Environment; Science and Technology; groundwater; groundwater resources; aquifers; subsurface geology; bedrock
topography; earthquakes; modelling; glacial deposits; glacial landforms; geophysical surveys; seismic reflection surveys; seismic profiles; in-field instrumentation; seismic velocities; seismic waves; s waves; seismic methods; seismology;
seismographs; geometric analyses; hydraulic analyses; Data processing; Phanerozoic; Cenozoic; Quaternary |
| Illustrations | location maps; plots; spectra; 3-D diagrams; seismic reflection profiles; geophysical profiles; geoscientific sketch maps; rose diagrams; tables |
| Program | Groundwater Geoscience Aquifer Assessment & support to mapping |
| Released | 2020 05 28 |
| Abstract | Ambient seismic noise, and specifically the Horizontal-to-Vertical Spectral Ratio (HVSR), is routinely used for seismic microzonation, assessment of earthquake site characteristics and bedrock depth
information for hydrogeological studies. These measurements not only provide peak frequency or period of a seismic resonator, but the shape of the spectral ratio can also give insight into the architecture of subsurface structure. For example a
dipping resonator decreases the peak amplitude and increases the peak frequency of the spectrum. Effects of two-dimensional (2-D) subsurface structure (non-horizontal layering) have been successfully modelled and can be observed on the orthogonal
Horizontal-to-Vertical Spectral Ratios, where N-S/V and E-W/V have different peak frequencies and peak amplitudes. By analysis of both horizontal spectral ratios the practitioner is able to determine whether one-dimensional (1-D) subsurface layering
is present and hence 1-D assumptions are appropriate, e.g. inverting shear-wave velocities (Vs), calculating average Vs and depth to the resonator. HVSR measurements collected along seismic reflection profiles with known resonator topography, e.g.
over steeply dipping bedrock resonators, are used to investigate both orthogonal horizontal components separately. Differences between the orthogonal H/V components are able to identify 2-D subsurface structure. Results demonstrate that extending
analysis beyond the peak frequency to include orthogonal Horizontal-to- Vertical Spectral Ratios adds important information related to dipping surfaces and their orientations. Due to the ease and rapidity of HVSR data collection, the technique is
ideally suited for reconnaissance scale survey work but also for infill where other data is sparse. |
| Summary | (Plain Language Summary, not published)
Collection of papers on work completed in the past five years as part of the southern Ontario Groundwater Project. This edited volume is a collection of
currently unreported work. |
| GEOSCAN ID | 321101 |
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