The P and Swave velocity perturbation model published in Schimmel et al. (2003) can be downloaded here.
Marcelo
Assumpção to the right and
Martin Schimmel to the left 
A prime tool to illuminate mantle structure is seismic tomography. Although it lacks the resolving power to constrain mantle discontinuities it provides us with reconstructions of the long and intermediate scale structure. We use this tool to map the P and Swave velocity anomalies underneath SEBrazil.
In the
following we list some selected figures which you can view by
clicking on the highlighted text. The results are compiled in a
publication (download
pdf.gz [6.7Mb] ).
In our publication you can find the details and more figures about
the tectonic settings, the resolution and data consistency tests.
Informations on the seismic
anisotropy, the upper mantle deformation in SE Brazil, and a
francobrazilian portable seismic experiment are
also provided by the tectonophysics group in Montpellier.
Map with the sites of seismic stations used so far for the relative arrival time data set and gross geological provinces. The solid lines are political boundaries and the dashed lines denote the main geological provinces. Up to 15 stations have been in operation at any time to record the events from 1992 to 1999. The stations are sorted by projects or owner; `bb' and `sp' stand for broadband and shortperiod sensor, respectively. The shortperiod stations are used to increment the Pwave data set.
Histograms for the relative P (a) and Swave (b) residuals after correction of station elevation. The P and Swave data sets consist of 5367 and 4763 residuals. Core phases and first arrivals are separated by colors. A gaussfunction with corresponding standard deviation and maximum count has been added for reference.
Relative travel time residuals of the direct P and S phases as function of back azimuth at stations FRMB (a), CDCB (b), BSCB (c), TRIB (d), RIFB (e), NATB (f). The symbols and error bars mark the means and standard deviations of at least four measures within a 10 deg bin centered every 5 deg.
Distribution of ray incidence angles at 400 km depth as function of back azimuths for the P (a) and Swave (b) data set. Every symbol corresponds to a ray. The horizontal bandshaped occurrence of incidence angles is due to the selected distance ranges. The data points cluster due to the uneven distribution of events.
Tomographic reconstructions for the Pwave phase times. The horizontal cross sections show the velocity perturbations at distinct depth levels. White lines mark the intersections with the vertical cross sections (AA' and BB') which are displayed in the next figure. White squares denote station sites used in the Swave inversion. Regions with low raydensity are blacked.
Tomographic reconstructions for the Swave phase times. The horizontal cross sections show the velocity perturbations at distinct depth levels. White lines mark the intersections with the vertical cross sections (AA' and BB') which are displayed in the next figure. White squares denote station sites used in the Swave inversion. Regions with low raydensity are blacked.
The P (left column) and S (right column) velocity perturbation models are displayed as vertical cross sections AA' and BB'. The elevations at the Earth's surface are multiplied by 30. Shallow structure is blacked since the ray paths are almost parallel beneath the stations.
Distribution of length sum of ray segments which constrain the P (a,c) and Swave (b,d) velocity perturbations along the cross sections AA' and BB', respectively.
The dashed lines mark our study area (e.g. see the station map for more details, figure from Pesquisa, 53, 2027, 2000).

Pwave velocity perturbations along the cross section AA' (from Pesquisa, 53, 2027, 2000). 
Back to my first page or to the Geophys. Dept. (IJACSIC)? 