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SEISMOLOGY AT IAG-USP. IAG: Inst. Astronomy, Geophysics & Atmospheric Sciences USP: University of São Paulo. Main Research Areas. Brazilian seismicity:. Crustal and upper mantle structure. Natural and dam-induced Seismic risk - Crustal stresses. deep seismic refraction

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seismology at iag usp

SEISMOLOGY AT IAG-USP

IAG: Inst. Astronomy, Geophysics & Atmospheric Sciences

USP: University of São Paulo

slide3
Main Research Areas

Brazilian seismicity:

Crustal and upper mantle 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

slide4
Natal, UFRN.

Univ. Federal

Rio Grande do Norte

(RCBR)

Brasilia, UnB

(BDFB)

Rio Claro, UNESP

(RCLB)

São Paulo, USP

IPT

Seismology Groups

dam-induced

natural

slide5
Risco Sísmico no Sudeste

mapa sismotectônico

acel. 0,1g -> return period 50.000 years

- Support from Petrobrás/Eletronuclear

slide6
Crustal Seismic Refraction

arco magm.

craton SF

Crustal section in Tocantins foldbelt between Amazon and

Sao Francisco cratons.

(Berrocal et al., 2004. Tectonophysics)

slide7
Present temporary

stations

temporary BB stations since 1992

7 STS-2

5 Guralps (100s)

10 RT 72A

a few 130

Swiss Stations (2002-2004)

Tomografia (Feng et al.,2006)

slide8
Upper Mantle P and S Tomography,

Central and SE Brazil.

Nazca plate

Engdahl,

Van der Hilst & Berrocal,

GRL 1995.

Schimmel,

Assumpção & VanDecar,

JGR 2003

slide9
Upper Mantle Surface Wave Tomography

- cooperation with Suzan Van der Lee (Northwestern Univ.)

Vs, 100km depth

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

slide10
Crustal structure with Receiver Functions

espessura crustal (km)

On going projects in cooperation with Natal,

Brasilia, Rio Claro, NWU, Univ. South Carolina,

slide11
Z

R

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

slide12
Inversão da Função do Receptor

basalto

arenitos

e

a

embasamento

b

Zevallos et al.(submitted 2005)

slide13
Future?

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.

1) Northern Paraná Basin :

Basement topography and basin evolution.

(with S. Carolina Univ.)

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