Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9457
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dc.contributor.authorallSapia, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallOldenborger, G. A.; Geological Survey of Canadaen
dc.contributor.authorallViezzoli, A.; Aarhus Geophysics Apsen
dc.contributor.authorallMarchetti, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.date.accessioned2015-04-02T06:33:32Zen
dc.date.available2015-04-02T06:33:32Zen
dc.date.issued2014-02-20en
dc.identifier.urihttp://hdl.handle.net/2122/9457en
dc.description.abstractHelicopter 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.isoEnglishen
dc.publisher.nameElsevier Science Limiteden
dc.relation.ispartofJournal of applied geophysicsen
dc.relation.ispartofseries/104 (2014)en
dc.subjectAirborne electromagnetics, Time domain electromagnetics, Hydrogeophysics, Data integrationen
dc.titleIncorporating ancillary data into the inversion of airborne time-domain electromagnetic data for hydrogeological applicationsen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber35 - 43en
dc.subject.INGV05. General::05.01. Computational geophysics::05.01.01. Data processingen
dc.identifier.doi10.1016/j.jappgeo.2014.02.009en
dc.description.obiettivoSpecifico7A. Geofisica di esplorazioneen
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.relation.issn0926-9851en
dc.relation.eissn1879-1859en
dc.contributor.authorSapia, V.en
dc.contributor.authorOldenborger, G. A.en
dc.contributor.authorViezzoli, A.en
dc.contributor.authorMarchetti, M.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentGeological Survey of Canadaen
dc.contributor.departmentAarhus Geophysics Apsen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptGeological Survey of Canada-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.orcid0000-0003-1958-2314-
crisitem.author.orcid0000-0002-9476-206X-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent05. General-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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