Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/9457
DC Field | Value | Language |
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dc.contributor.authorall | Sapia, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.authorall | Oldenborger, G. A.; Geological Survey of Canada | en |
dc.contributor.authorall | Viezzoli, A.; Aarhus Geophysics Aps | en |
dc.contributor.authorall | Marchetti, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.date.accessioned | 2015-04-02T06:33:32Z | en |
dc.date.available | 2015-04-02T06:33:32Z | en |
dc.date.issued | 2014-02-20 | en |
dc.identifier.uri | http://hdl.handle.net/2122/9457 | en |
dc.description.abstract | Helicopter time-domain electromagnetic (HTEM) surveys often suffer fromsignificant inaccuracies in the early-time or near-surface data—a problem that can lead to errors in the inversemodel or limited near-surface resolution in the event that early time gates are removed. We present an example illustrating the use of seismic data to constrain the model recovered from an HTEM survey over the Spiritwood buried valley aquifer in Manitoba, Canada. The incorporation of seismic reflection surfaces results in improved near-surface resistivity in addition to a more continuous bedrock interface with a sharper contact. The seismic constraints reduce uncertainty in the resistivity values of the overlying layers, although no a priori information is added directly to those layers. Subsequently, we use electrical resistivity tomography (ERT) and borehole data to verify the constrained HTEM models. Treating the ERT and borehole logs as reference information, we perform an iterative time-shift calibration of the HTEM soundings to achieve regional-scale consistency between the recovered HTEM models and the reference information. Given the relatively small time-shifts employed, this calibration procedure most significantly affects the early-time data and brings the first useable time gate to a time earlier than the nominal first gate after ramp off. Although time shifts are small, changes in the model are observed from the near-surface to depths of 100 m. Calibration is combined with seismic constraints to achieve amodel with the greatest level of consistency between data sets and, thus, the greatest degree of confidence. For the Spiritwood buried valley, calibrated and constrained models reveal more structure in the valley-fill sediments and increased continuity of the bedrock contact. | en |
dc.language.iso | English | en |
dc.publisher.name | Elsevier Science Limited | en |
dc.relation.ispartof | Journal of applied geophysics | en |
dc.relation.ispartofseries | /104 (2014) | en |
dc.subject | Airborne electromagnetics, Time domain electromagnetics, Hydrogeophysics, Data integration | en |
dc.title | Incorporating ancillary data into the inversion of airborne time-domain electromagnetic data for hydrogeological applications | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 35 - 43 | en |
dc.subject.INGV | 05. General::05.01. Computational geophysics::05.01.01. Data processing | en |
dc.identifier.doi | 10.1016/j.jappgeo.2014.02.009 | en |
dc.description.obiettivoSpecifico | 7A. Geofisica di esplorazione | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | restricted | en |
dc.relation.issn | 0926-9851 | en |
dc.relation.eissn | 1879-1859 | en |
dc.contributor.author | Sapia, V. | en |
dc.contributor.author | Oldenborger, G. A. | en |
dc.contributor.author | Viezzoli, A. | en |
dc.contributor.author | Marchetti, M. | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.department | Geological Survey of Canada | en |
dc.contributor.department | Aarhus Geophysics Aps | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.dept | Geological Survey of Canada | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.orcid | 0000-0003-1958-2314 | - |
crisitem.author.orcid | 0000-0002-9476-206X | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 05. General | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
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Sapia _JAG _2014.pdf | Main article | 990.09 kB | Adobe PDF |
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