Abstract
Pantanal da Nhecolândia is one of the most well-preserved areas in the State of Mato Grosso do Sul. Located in the southern part of the Taquari River megafan, it is in tectonic contact with the fault escarpments of the Maracaju-Campo Grande plateaus to the east and with the fault escarpments of the Bodoquena plateau to the west, which continue to north. To the south and to the north, the limits are marked respectively by the lineaments of the Negro and Taquari Rivers. Nhecolândia is characterized by the existence of at least 17,631 lagoons, 17,050 (96.70 %) of which are of fresh water (baías) and 577 (3.3 %) of salty water (salinas). Studies based on (Landsat) satellite images and use of free software (QGIS, version 2.8.3) and GIS (Geographic Information Systems) revealed that the major axes of the lagoons are aligned along two directions, NE (62.49 %) and NW (37.51 %), with modes concentrated between N30-40E and N30-40W, suggesting in both cases the role played by tectonic control (neotectonics) in their formation. Evidences of fluvial origin are presented for these groups of lagoons, as well as for their tectonic alignment.
Highlights
Branner (1912) is probably responsible for the first reference to seismicity in Pantanal, in the State of Mato Grosso do Sul (Brazil)
After the formation of this fan, the regional neotectonics divided it in three distinct domains: the first, to the north, in the Paiaguás region, is higher than the other two, remaining dry, whereas the other two regions are always flooded (Figure 2); the second, in the central part of the structure, is the present, still active lobe of the Taquari River, which is tectonically controlled (Assine and Soares 2004, Assine 2003, Rabelo and Soares 1999), and corresponds to a region that remains covered by a water layer or flooded the whole year
This study reiterates the proposals of the existence of tectonic limits in the Taquari megafan, to the east with the scarps of the Maracaju-Campo Grande and Taquari-Itiquira plateaus, to the south with the Negro River lineament, to the west with faults that mark the eastern border of the Bodoquena plateau scarps and that continue northwards and condition the Paraguay River course
Summary
Branner (1912) is probably responsible for the first reference to seismicity in Pantanal, in the State of Mato Grosso do Sul (Brazil) It was only after more than half a century that the first seismic records have been obtained, thanks to the the Portal of the National Seismologic System in 2014, which made the real-time transmission of seismographic data possible. In 2010, the second strongest earthquake recorded in the region occurred in Coxim in the eastern part of Pantanal, reaching magnitude 4.8 on the Richter scale. Both earthquakes were associated with inverse fault activity (Facincani et al 2012, Assumpção and Suárez 1988, Assumpção et al 2009). Earthquake records have been obtained in the vicinity of Nhecolândia, in special close to the limit between Paiguás and Nhecolândia (Almeida et al 2015)
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