Repository logo
 
Publication

Monte Carlo approach to assess the uncertainty of wide-angle layered models: Application to the Santos Basin, Brazil

2016-06Journal article Restricted access
Simple item page
dc.contributor.authorLoureiro, Afonso
dc.contributor.authorAfilhado, Alexandra
dc.contributor.authorMatias, Luis
dc.contributor.authorMoulin, Maryline
dc.contributor.authorAslanian, Daniel
dc.date.accessioned2017-07-25T13:42:19Z
dc.date.available2017-07-25T13:42:19Z
dc.date.issued2016-06
dc.description.abstractIn the Santos Basin (Brazil), two parallel wide-angle refraction profiles show different crustal structures. One shows moderate crustal velocity gradient, and a clear Moho with topography. The other has an anomalous velocity zone, and no clear Moho reflections. This has large implications on the geological and geodynamical interpretation of the basin. Model uncertainties must be excluded as a source of t hese differences. We developed VMONTECARLO, a tool to assess model uncertainty of layered velocity models using a Monte Carlo approach and simultaneous parameter perturbation using all picked refracted and reflected arrivals. It gives insights into the acceptable geological interpretations allowed by data and model uncertainty through velocitydepth plots that provide: a) the velocity-depth profile range that is consistent with the travel times; b) the random model that provides the best fit, keeping most of the observations covered by ray-tracing; c) insight into valid models dispersion; d) main model features unequivocally required by the travel times, e.g., first-order versus second-order discontinuities, and velocity gradient magnitudes; e) parameter value probability distribution histograms. VMONTECARLO is seamlessly integrated into a RAYINVR-based modelling work-flow, and can be used to assess final models or sound the solution space for alternate models, and is also capable of evaluating forward models without the need for inversion, thus avoiding local minima that may trap the inversion algorithms and providing information for models still not well-parametrised. Results for the Brazilian models show that the imaged structures are indeed geologically different and are not due to different interpretations of the same features within the model uncertainty bounds. These differences highlight the strong heterogeneity of the crust in the middle of the Santos Basin, where the rift is supposed to have failed.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLoureiro, Afonso [et al] - Monte Carlo approach to assess the uncertainty of wide-angle layered models: Application to the Santos Basin, Brazil. Tectonophysics. ISSN: 0040-1951. Vol. 683, (2016), pp. 286-307pt_PT
dc.identifier.doi10.1016/j.tecto.2016.05.040pt_PT
dc.identifier.issn0040-1951
dc.identifier.urihttp://hdl.handle.net/10400.21/7305
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionfile:///C:/Users/utilizador2/Downloads/Monte%20Carlo%20approach_AAlfilhado_.pdfpt_PT
dc.subjectBrazilpt_PT
dc.subjectSantos Basinpt_PT
dc.subjectVelocity and depth uncertaintypt_PT
dc.subjectWideangle seismic reflection and refractionpt_PT
dc.subjectRay-tracing and travel time inversionpt_PT
dc.subjectMonte Carlopt_PT
dc.subjectModel assessment and probability distributionpt_PT
dc.titleMonte Carlo approach to assess the uncertainty of wide-angle layered models: Application to the Santos Basin, Brazilpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage307pt_PT
oaire.citation.startPage286pt_PT
oaire.citation.titleTectonophysicspt_PT
oaire.citation.volume684pt_PT
person.familyNameAfilhado
person.familyNameAslanian
person.givenNameAlexandra
person.givenNameDaniel
person.identifier.ciencia-id7314-CD91-482F
person.identifier.orcid0000-0003-0256-8540
person.identifier.orcid0000-0002-9394-606X
person.identifier.ridA-2267-2013
person.identifier.scopus-author-id24381876200
person.identifier.scopus-author-id6701517007
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication8c33b6bc-ca31-4d7a-a9e4-a6a694e809d3
relation.isAuthorOfPublication4cdee7fa-c581-427b-9513-df28a489a461
relation.isAuthorOfPublication.latestForDiscovery8c33b6bc-ca31-4d7a-a9e4-a6a694e809d3

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Monte Carlo approach_AAlfilhado_ADEC.pdf
Size:
4.3 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

ISEL - Eng. Civil - Artigos