Pantanal-Chaco-Paraná basins (PCPB): crust and upper mantle seismic structure and evolution

• Grant number: 13/24215-6
• Support type: Research Projects - Thematic Grants
• Duration: September 01, 2015 - August 31, 2022
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Principal researcher: Marcelo Sousa de Assumpção
• Grantee: Marcelo Sousa de Assumpção
• Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Pesquisadores principais:( Últimos ): Antonio Lopes Padilha
• Pesquisadores principais:( Antigos ): Icaro Vitorello
• Assoc. researchers: Andreas Rietbrock ; Antonio Conceição Paranhos Filho ; Antonio Lopes Padilha ; Edna Maria Facincani ; Gabriel Negrucci Dragone ; João Carlos Dourado ; Jordi Julià Casas ; José Marcato Junior ; Marcelo Belentani de Bianchi ; Marcelo Peres Rocha ; Marcus Vinicius Aparecido Gomes de Lima ; Mario Luis Assine ; Martin Schimmel ; MAURICIO DE SOUZA BOLOGNA ; Suzan van der Lee ; Victor Sacek
• Associated scholarship(s): 22/04439-6 - Analysis of the upper mantle seismic anisotropy beneath Brazil from XKS splitting measurements, BP.IC; 18/19562-2 - Study of physical and structural properties in the region of the Pantanal, Paraná and Chaco-Paraná basins using joint inversion of gravimetric observations and surface waves velocity, BP.DR; 17/02968-3 - Geodynamic Study of Terrestrial Crustal Deformation through GNSS Geodetic Network, BP.PD; + associated scholarships 17/18627-0 - Numerical modeling of stresses in the interior of the continental lithosphere: application in the Pantanal and Chaco-Paraná basins, BP.IC; 17/10554-4 - Stress field evolution in the lithosphere: a numerical approach, BP.DR; 16/20952-4 - Environmental noise tomography in the Pantanal and Paraná basins, BP.PD; 16/13297-0 - Seismicity and focal mechanism studies, BP.PD; 16/11117-4 - Numerical modeling of stresses inside the continental lithosphere, BP.IC; 16/12589-7 - Monitoring local and regional seismicity, BP.IC; 16/03120-5 - Full-waveform tomography of South America with spectral-element and adjoint methods, BP.DD; 16/04433-7 - Regional time-lapse tomography for P and S waves, BP.IC - associated scholarships

Abstract

Crustal and upper mantle structure beneath three major sedimentary basins in SE and Central Brazil (Pantanal, Chaco and Paraná) will be studied by deploying about 40 temporary seismic stations. Together with the stations of the permanent Brazilian Seismic Network, a total of about 60 stations will be used in several different tomography studies to improve our knowledge of upper mantle processes and evolution of intracontinental basins. This multi-national project has partners from Bolivia (Observatório San Calixto), Paraguay (Universidad Nacional), Argentina (INPRES and Universidad de La Plata) and Uruguay (Universidad de la Republica) cooperating in setting up the stations and analysing the data. Partners from other universities in Brazil (IPT, UnB, UFRN, UFMS, UNESP, and Unipampa) and abroad (Northwestern University, USA; Liverpool and Royal Holloway London, UK; CSIC, Barcelona, Spain) will also cooperate in the analyses. In addition to the seismic studies, complementary high-precision geodetic studies will be conducted by INPE to a) study internal deformation of the South American plate and b) infer rheological properties of the lithosphere to contribute to the intepretation of upper mantle structure. Numerical models of upper mantle flow will help understand how deep convection and plate motion can affect crustal behavior, and cause dynamic topography, subsidence and seismogenic stresses. The equipment to be installed in the temporary network will come from a) 20 new equipment to be purchased by the Project, b) 20 loaned from the Brazilian Equipment Pool (managed by the National Observatory, Rio de Janeiro), and c) 10 loaned form Liverpool University. INPE will install 15 new GNSS stations and service the other existing stations of the Brazilian GNSS network. The Project requires purchase of new seismic equipment, some extra auxiliary equipment, expenses for field work (both to deploy the temporary stations as well as to service the permanent stations), travelling for collaboration with partners from neighboring countries, as well as student and staff exchange with NWU, Liverpool, RHWL, and CSIC. Scholarships for IC, PhD, and PD are also requested. (AU)

Scientific publications

(6)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE MELO, BRUNA CHAGAS; ASSUMPCAO, MARCELO; TEAM, 3-BASINS PROJECT. Mantle anisotropy and asthenospheric flow around cratons in southeastern South America. Geophysical Journal International, v. 215, n. 1, p. 494-506, OCT 2018. (13/24215-6)

FERNANDEZ, GONZALO A.; ASSUMPCAO, M.; NIETO, M.; GRIFFITHS, T.; CONVERS, J.. Focal mechanism of the 5.1Mw 2014 Lloja earthquake, Bolivia: Probing the transition between extensional stresses of the central Altiplano and compressional stresses of the sub-Andes. Journal of South American Earth Sciences, v. 91, p. 102-107, APR 2019. (13/24215-6, 16/13297-0)

RODRIGUEZ, EMILY E.; PORTNER, DANIEL EVAN; BECK, SUSAN L.; ROCHA, MARCELO P.; BIANCHI, MARCELO B.; ASSUMPCAO, MARCELO; RUIZ, MARIO; ALVARADO, PATRICIA; CONDORI, CRISTOBAL; LYNNER, COLTON. Mantle dynamics of the Andean Subduction Zone from continent-scale teleseismic S-wave tomography. Geophysical Journal International, v. 224, n. 3, p. 1553-1571, MAR 2021. (13/24215-6)

CEDRAZ, V; JULIA, J.; ASSUMPCAO, M.. Joint Inversion of Receiver Functions and Surface-Wave Dispersion in the Pantanal Wetlands: Implications for Basin Formation. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, v. 125, n. 2, FEB 2020. (13/24215-6)

SHIRZAD, TAGHI; ASSUMPCAO, MARCELO; BIANCHI, MARCELO. Ambient seismic noise tomography in west-central and Southern Brazil, characterizing the crustal structure of the Chaco-Parana, Pantanal and Parana basins. Geophysical Journal International, v. 220, n. 3, p. 2074-2085, MAR 2020. (13/24215-6, 16/20952-4)

ROCHA, M. P.; ASSUMPCAO, M.; AFFONSO, G. M. P. C.; AZEVEDO, P. A.; BIANCHI, M.. Teleseismic P Wave Tomography Beneath the Pantanal, Parana, and Chaco-Parana Basins, SE South America: Delimiting Lithospheric Blocks of the SW Gondwana Assemblage. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, v. 124, n. 7, p. 7120-7137, JUL 2019. (13/24215-6)