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Joint seismic and gravity data inversion to image intra-crustal structures: The Ivrea Geophysical Body along the Val Sesia Profile (Piedmont, Italy)
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SYSNO ASEP 0544667 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Joint seismic and gravity data inversion to image intra-crustal structures: The Ivrea Geophysical Body along the Val Sesia Profile (Piedmont, Italy) Author(s) Scarponi, M. (CH)
Hetényi, G. (CH)
Plomerová, Jaroslava (GFU-E) ORCID, RID, SAI
Solarino, S. (IT)
Baron, L. (CH)
Petri, B. (FR)Article number 671412 Source Title Frontiers in Earth Science. - : Frontiers Media
Roč. 9, May (2021)Number of pages 17 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords joint inversion ; seismic receiver functions ; gravity anomalies ; Ivrea Geophysical Body ; Ivrea-Verbano Zone ; continental crust ; intra-crustal structure Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Volcanology R&D Projects LM2015079 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA21-25710S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support GFU-E - RVO:67985530 UT WOS 000659893100001 EID SCOPUS 85107594900 DOI 10.3389/feart.2021.671412 Annotation 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. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2022 Electronic address https://www.frontiersin.org/articles/10.3389/feart.2021.671412/full
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