SEISMOLOGY AT SEISMOLOGY AT IAG-USP IAG-USP

IAG: Inst. Astronomy, Geophysics & Atmospheric SciencesIAG: Inst. Astronomy, Geophysics & Atmospheric Sciences

USP: University of São PauloUSP: University of São Paulo

Staff Academic: Jesus Berrocal Marcelo Assumpção Technicians: Luis Galhardo, Célia Fernandes, Denis Schramm José Roberto Barbosa Cleusa Barbosa Students: PhD: Marcelo Bianchi, Marcelo Rocha, Afonso Lopes MS: Thiago Costa, Marcelo Guarido PD: Fábio Perosi

Main Research Areas

Brazilian Brazilian seismicity:seismicity:

Crustal and upper Crustal and upper mantle structuremantle structure

- Natural and dam-induced

- Seismic risk

- Crustal stresses

- deep seismic refraction

- receiver functions

- upper mantle tomography

Cooperation with Carnegie Institute, USGS-Menlo Park Northwestern University, Montpellier (France), Univ. S. Carolina, Barcelona, Potsdam

Rio Claro, UNESP(RCLB)

Brasilia, UnB(BDFB)

São Paulo, USP

naturaldam-induced

Natal, UFRN.Univ. FederalRio Grande do Norte(RCBR)

Seismology Groups

IPT

- Support from Petrobrás/Eletronuclear

Risco Sísmico no SudesteRisco Sísmico no Sudeste

acel. 0,1g -> return period 50.000 yearsmapa sismotectônico

Crustal section in Tocantins foldbelt between Amazon and Sao Francisco cratons.

(Berrocal et al., 2004. Tectonophysics)

Crustal Seismic RefractionCrustal Seismic Refraction

arco magm. craton SF

temporary BB temporary BB stations since 1992stations since 1992

7 STS-27 STS-25 Guralps (100s)5 Guralps (100s)

10 RT 72A10 RT 72A a few 130a few 130

Swiss Stations Swiss Stations (2002-2004)(2002-2004)

Present temporaryPresent temporarystationsstations

Tomografia (Feng et al.,2006)Tomografia (Feng et al.,2006)

Upper Mantle P and S Tomography,Upper Mantle P and S Tomography,Central and SE Brazil.Central and SE Brazil.

Engdahl,Van der Hilst & Berrocal,GRL 1995.

Schimmel, Assumpção & VanDecar,JGR 2003

Nazca plate

Upper Mantle Surface Wave TomographyUpper Mantle Surface Wave Tomography- cooperation with Suzan Van der Lee (Northwestern Univ.)

Vs, 100km depth

Phys. Earth Planet. Int. 2004; JGR 2006, submitted

Crustal structure with Receiver FunctionsCrustal structure with Receiver Functions

On going projects in cooperation with Natal,Brasilia, Rio Claro, NWU, Univ. South Carolina,

esp

ess

ura

cru

sta

l (km

)

high frequency (~5Hz) receiver functions in sedimentary basins

RZ

Inversão da Função do Receptor

basalto

arenitos

embasamento

Zevallos et al.(submitted 2005)

b

ae

1) Northern Paraná Basin :Basement topography and basin evolution.

(with S. Carolina Univ.)

2) Crustal and upper mantle structure.(with Natal, NWU, S. Carolina Univ, Barcelona)

Pool of 40 BB + 400 texans,to be funded by Petrobrás and used by Brazilian universities.

Future?