Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/10566
DC Field | Value | Language |
---|---|---|
dc.date.accessioned | 2017-05-17T06:00:16Z | en |
dc.date.available | 2017-05-17T06:00:16Z | en |
dc.date.issued | 2017-05-09 | en |
dc.identifier.uri | http://hdl.handle.net/2122/10566 | en |
dc.description.abstract | In this study we combine seismological and GOCE satellite gravity information by using a Bayesian-like technique, with the aim of inferring the density structure of the Pacific (90°N 90°S) (121°E 60°W) lithosphere and upper mantle. We recover a 1° × 1° 3-D density model, down to 300 km depth, which explains gravity observations with a variance reduction of 67.41%. The model, with an associated a posteriori standard deviation, provides a significant contribution to understanding the evolution of the Pacific lithosphere and answers to some debated geodynamic questions. Our methodology enables us to combine the recovery of density parameters with the optimum density-vSV scalings. The latter account for both seismological and gravity observations in order to identify the regions characterized by chemically-induced density heterogeneities which add to the thermally-induced anoma- lies. Chemically-modified structures are found west of the East Pacific Rise (EPR) and are of relevant amplitude both below the north-western side of the Pacific Plate, at the base of the lithosphere, and up to 100 km depth beneath the Hawaiian and Super Swell regions, thus explaining the anomalous shallow regions without invoking the thermal buoyancy as the sole justification. Coherently with the chemically modified structures, our results a) support a lighter and more buoyant lithosphere than that predicted by the cooling models and b) are in favor of the hypothesized crustal underplating beneath the Hawaiian chain and be- neath the volcanic units in the southern branch of the Super Swell region. The comparison between calculated mantle gravity residuals and residual topography a) suggests a lateral viscosity growth associated with the increasing thickness and density of the Plate and b) correlates well with sub-lithospheric mantle flow from the EPR towards west, up to the Kermadec and Tonga Trench in the south and the Kuril-Kamchatka Trench in the north. | en |
dc.language.iso | English | en |
dc.publisher.name | Elsevier | en |
dc.relation.ispartof | Tectonophysics | en |
dc.relation.ispartofseries | /705 (2017) | en |
dc.subject | Pacific lithosphere | en |
dc.subject | GOCE | en |
dc.subject | Satellite gravity | en |
dc.subject | Seismological observations | en |
dc.subject | Residual Topography | en |
dc.title | The combined inversion of seismological and GOCE gravity data: New insights into the current state of the Pacific lithosphere and upper mantle | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 101-115 | en |
dc.subject.INGV | 04.07. Tectonophysics | en |
dc.identifier.doi | 10.1016/j.tecto.2017.03.013 | en |
dc.description.obiettivoSpecifico | 7T. Struttura della Terra e geodinamica | en |
dc.description.journalType | JCR Journal | en |
dc.contributor.author | Tondi, Rosaria | en |
dc.contributor.author | Gilardoni, Maddalena | en |
dc.contributor.author | Reguzzoni, MIrko | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia | en |
dc.contributor.department | DICA, Politecnico di Milano | 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 Bologna, Bologna, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia | - |
crisitem.author.orcid | 0000-0001-9400-3904 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
TECTO_PACIFIC.pdf | 10.11 MB | Adobe PDF | ||
TECTO_submitted.pdf | Open Access | 34.39 MB | Adobe PDF | View/Open |
WEB OF SCIENCETM
Citations
20
6
checked on Feb 10, 2021
Page view(s)
381
checked on Apr 20, 2024
Download(s)
17
checked on Apr 20, 2024