Joint seismic and gravity data inversion to image intra-crustal structures: The Ivrea Geophysical Body along the Val Sesia Profile (Piedmont, Italy)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F21%3A00544667" target="_blank" >RIV/67985530:_____/21:00544667 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.frontiersin.org/articles/10.3389/feart.2021.671412/full" target="_blank" >https://www.frontiersin.org/articles/10.3389/feart.2021.671412/full</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3389/feart.2021.671412" target="_blank" >10.3389/feart.2021.671412</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Joint seismic and gravity data inversion to image intra-crustal structures: The Ivrea Geophysical Body along the Val Sesia Profile (Piedmont, Italy)

Popis výsledku v původním jazyce

We present results from a joint inversion of new seismic and recently compiled gravity data to constrain the structure of a prominent geophysical anomaly in the European Alps: the Ivrea Geophysical Body (IGB). We investigate the IGB structure along the West-East oriented Val Sesia profile at higher resolution than previous studies. We deployed 10 broadband seismic stations at 5 km spacing for 27 months, producing a new database of similar to 1000 high-quality seismic receiver functions (RFs). The compiled gravity data yields 1 gravity point every 1-2 km along the profile. We set up an inversion scheme, in which RFs and gravity anomalies jointly constrain the shape and the physical properties of the IGB. We model the IGB's top surface as a single density and shear-wave velocity discontinuity, whose geometry is defined by four, spatially variable nodes between far-field constraints. An iterative algorithm was implemented to efficiently explore the model space, directing the search toward better fitting areas. For each new candidate model, we use the velocity-model structures for both ray-tracing and observed-RFs migration, and for computation and migration of synthetic RFs: the two migrated images are then compared via cross-correlation. Similarly, forward gravity modeling for a 2D density distribution is implemented. The joint inversion performance is the product of the seismic and gravity misfits. The inversion results show the IGB protruding at shallow depths with a horizontal width of similar to 30 km in the western part of the profile. Its shallowest segment reaches either 3-7 or 1-3 km depth below sea-level.

Název v anglickém jazyce

Joint seismic and gravity data inversion to image intra-crustal structures: The Ivrea Geophysical Body along the Val Sesia Profile (Piedmont, Italy)

Popis výsledku anglicky

We present results from a joint inversion of new seismic and recently compiled gravity data to constrain the structure of a prominent geophysical anomaly in the European Alps: the Ivrea Geophysical Body (IGB). We investigate the IGB structure along the West-East oriented Val Sesia profile at higher resolution than previous studies. We deployed 10 broadband seismic stations at 5 km spacing for 27 months, producing a new database of similar to 1000 high-quality seismic receiver functions (RFs). The compiled gravity data yields 1 gravity point every 1-2 km along the profile. We set up an inversion scheme, in which RFs and gravity anomalies jointly constrain the shape and the physical properties of the IGB. We model the IGB's top surface as a single density and shear-wave velocity discontinuity, whose geometry is defined by four, spatially variable nodes between far-field constraints. An iterative algorithm was implemented to efficiently explore the model space, directing the search toward better fitting areas. For each new candidate model, we use the velocity-model structures for both ray-tracing and observed-RFs migration, and for computation and migration of synthetic RFs: the two migrated images are then compared via cross-correlation. Similarly, forward gravity modeling for a 2D density distribution is implemented. The joint inversion performance is the product of the seismic and gravity misfits. The inversion results show the IGB protruding at shallow depths with a horizontal width of similar to 30 km in the western part of the profile. Its shallowest segment reaches either 3-7 or 1-3 km depth below sea-level.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Frontiers in Earth Science

ISSN

2296-6463

e-ISSN

2296-6463

Svazek periodika

9

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

17

Strana od-do

671412

Kód UT WoS článku

000659893100001

EID výsledku v databázi Scopus

2-s2.0-85107594900