Imaging the Mt. Melbourne Volcanic Field (Northern Victoria Land, Antarctica): a Hamiltonian Monte Carlo approach applied to high-resolution aeromagnetic data
The Mt. Melbourne Volcanic Complex (MMVC) is located in Northern Victoria Land (Antarctica) along the western flank of the West Antarctic Rift System, at the boundary with the Transantarctic Mountains. It is constituted by two main volcanic areas, i.e. the Mt. Melbourne Edifice (MME) and the Cape Wa...
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ftunivgenova:oai:iris.unige.it:11567/1038400 2024-01-28T09:59:19+01:00 Imaging the Mt. Melbourne Volcanic Field (Northern Victoria Land, Antarctica): a Hamiltonian Monte Carlo approach applied to high-resolution aeromagnetic data Ghirotto, Alessandro Zunino, Andrea Armadillo, Egidio Crispini, Laura Ferraccioli, Fausto Ghirotto, Alessandro Zunino, Andrea Armadillo, Egidio Crispini, Laura Ferraccioli, Fausto 2021 ELETTRONICO http://hdl.handle.net/11567/1038400 eng eng ispartofbook:EGUsphere-egu21 EGU General Assembly 2021 firstpage:9106 lastpage:9106 numberofpages:1 http://hdl.handle.net/11567/1038400 info:eu-repo/semantics/conferenceObject 2021 ftunivgenova 2024-01-03T18:02:15Z The Mt. Melbourne Volcanic Complex (MMVC) is located in Northern Victoria Land (Antarctica) along the western flank of the West Antarctic Rift System, at the boundary with the Transantarctic Mountains. It is constituted by two main volcanic areas, i.e. the Mt. Melbourne Edifice (MME) and the Cape Washington Shield (CWS), and some other minor centres. To date, the inner structure of this volcanic complex is still poorly known, being the direct geological information on site confined to either glacial erratics or a few rock outcrops not hidden by the ice sheet. Consequently, even the temporal building up and evolution of the MMVC as well as its primary magmatic source are still under investigation (debated). Recently, we attempted to define the geological structure of the MMVC by means of digital enhancement and forward modeling performed on a high-resolution aeromagnetic dataset (Ghirotto et al. 2020, EGU). Coupling both information derived from past geological/geophysical studies and unpublished magnetic susceptibility measurements from rock samples collected in the field, we proposed two models to explain the chronological evolution of the MME and CWS. These models involve either i) major magmatic events occurred in periods of both normal and reverse magnetic polarity or ii) only magmatic flows with normal polarity. To gain further insights into the geological structure and the geodynamic evolution of the MMVC in relation to the two proposed models, we develop here a Hamiltonian Monte Carlo (HMC) algorithm (Fichtner et al. 2018) based on the probabilistic approach to inverse problems. To date, this methodology has never been applied to aeromagnetic data for geological studies. In detail, the above proposed models provide some soft a priori information from which to start exploring potential solutions. The parameterization of the volcanic area is defined in terms of 2-D polygonal bodies, representing e.g. magmatic lava flows, where the unknown parameters are represented by both the position of the vertices ... Conference Object Antarc* Antarctic Antarctica Ice Sheet Victoria Land Università degli Studi di Genova: CINECA IRIS Antarctic Victoria Land Transantarctic Mountains Cape Washington ENVELOPE(-154.800,-154.800,-78.100,-78.100) |
institution |
Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
description |
The Mt. Melbourne Volcanic Complex (MMVC) is located in Northern Victoria Land (Antarctica) along the western flank of the West Antarctic Rift System, at the boundary with the Transantarctic Mountains. It is constituted by two main volcanic areas, i.e. the Mt. Melbourne Edifice (MME) and the Cape Washington Shield (CWS), and some other minor centres. To date, the inner structure of this volcanic complex is still poorly known, being the direct geological information on site confined to either glacial erratics or a few rock outcrops not hidden by the ice sheet. Consequently, even the temporal building up and evolution of the MMVC as well as its primary magmatic source are still under investigation (debated). Recently, we attempted to define the geological structure of the MMVC by means of digital enhancement and forward modeling performed on a high-resolution aeromagnetic dataset (Ghirotto et al. 2020, EGU). Coupling both information derived from past geological/geophysical studies and unpublished magnetic susceptibility measurements from rock samples collected in the field, we proposed two models to explain the chronological evolution of the MME and CWS. These models involve either i) major magmatic events occurred in periods of both normal and reverse magnetic polarity or ii) only magmatic flows with normal polarity. To gain further insights into the geological structure and the geodynamic evolution of the MMVC in relation to the two proposed models, we develop here a Hamiltonian Monte Carlo (HMC) algorithm (Fichtner et al. 2018) based on the probabilistic approach to inverse problems. To date, this methodology has never been applied to aeromagnetic data for geological studies. In detail, the above proposed models provide some soft a priori information from which to start exploring potential solutions. The parameterization of the volcanic area is defined in terms of 2-D polygonal bodies, representing e.g. magmatic lava flows, where the unknown parameters are represented by both the position of the vertices ... |
author2 |
Ghirotto, Alessandro Zunino, Andrea Armadillo, Egidio Crispini, Laura Ferraccioli, Fausto |
format |
Conference Object |
author |
Ghirotto, Alessandro Zunino, Andrea Armadillo, Egidio Crispini, Laura Ferraccioli, Fausto |
spellingShingle |
Ghirotto, Alessandro Zunino, Andrea Armadillo, Egidio Crispini, Laura Ferraccioli, Fausto Imaging the Mt. Melbourne Volcanic Field (Northern Victoria Land, Antarctica): a Hamiltonian Monte Carlo approach applied to high-resolution aeromagnetic data |
author_facet |
Ghirotto, Alessandro Zunino, Andrea Armadillo, Egidio Crispini, Laura Ferraccioli, Fausto |
author_sort |
Ghirotto, Alessandro |
title |
Imaging the Mt. Melbourne Volcanic Field (Northern Victoria Land, Antarctica): a Hamiltonian Monte Carlo approach applied to high-resolution aeromagnetic data |
title_short |
Imaging the Mt. Melbourne Volcanic Field (Northern Victoria Land, Antarctica): a Hamiltonian Monte Carlo approach applied to high-resolution aeromagnetic data |
title_full |
Imaging the Mt. Melbourne Volcanic Field (Northern Victoria Land, Antarctica): a Hamiltonian Monte Carlo approach applied to high-resolution aeromagnetic data |
title_fullStr |
Imaging the Mt. Melbourne Volcanic Field (Northern Victoria Land, Antarctica): a Hamiltonian Monte Carlo approach applied to high-resolution aeromagnetic data |
title_full_unstemmed |
Imaging the Mt. Melbourne Volcanic Field (Northern Victoria Land, Antarctica): a Hamiltonian Monte Carlo approach applied to high-resolution aeromagnetic data |
title_sort |
imaging the mt. melbourne volcanic field (northern victoria land, antarctica): a hamiltonian monte carlo approach applied to high-resolution aeromagnetic data |
publishDate |
2021 |
url |
http://hdl.handle.net/11567/1038400 |
long_lat |
ENVELOPE(-154.800,-154.800,-78.100,-78.100) |
geographic |
Antarctic Victoria Land Transantarctic Mountains Cape Washington |
geographic_facet |
Antarctic Victoria Land Transantarctic Mountains Cape Washington |
genre |
Antarc* Antarctic Antarctica Ice Sheet Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Victoria Land |
op_relation |
ispartofbook:EGUsphere-egu21 EGU General Assembly 2021 firstpage:9106 lastpage:9106 numberofpages:1 http://hdl.handle.net/11567/1038400 |
_version_ |
1789334005307408384 |