@Article{RossettiToleVale:2019:GeEvCo,
               author = "Rossetti, Dilce de F{\'a}tima and Toledo, Peter Mann de and 
                         Valeriano, M{\'a}rcio de Morisson",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Neotectonics and tree mortality in a forest ecosystem of the Negro 
                         basin: Geomorphic evidence of contemporary seismicity in the 
                         intracratonic Brazilian Amazonia",
              journal = "Geomorphology",
                 year = "2019",
               volume = "329",
                pages = "138--151",
                month = "Mar.",
             keywords = "Strike slip faults, Neotectonics, Forest structure, Amazonian 
                         rainforest.",
             abstract = "Neotectonic activity was increasingly recorded over the Amazonian 
                         lowlands, even during historical times of a few tens of centuries. 
                         However, detailed analyses linking structures and styles of 
                         deformation are still few considering the large dimension of the 
                         region. Such events in a relatively recent time are expected to 
                         have caused conspicuous impacts on Amazonian ecosystems and forest 
                         disturbance. Changes in topography and hydrology by fracturing, 
                         faulting and folding during either subsidence or uplifting are 
                         direct effects on landscape that leave marks on the structure of 
                         the current forest, such as tree mortality and community 
                         succession. Two rectangular elbow-like shaped wetlands from the 
                         left margin of the middle Negro River valley in northwestern 
                         Amazonia were attributed to neotectonics. Remote sensing imagery 
                         was applied to test this hypothesis and also provide a tectonic 
                         model that can explain deformation dynamics in this area. The 
                         studied wetlands and adjacent river systems display various 
                         morphostructural anomalies compatible with a tectonic control, as 
                         well as lineaments paralleling main NW and NE-trending regional 
                         structures. The geomorphic analysis led to suggest that the 
                         wetlands are depressions formed by NW and NE-trending master 
                         boundary faults of horizontal displacements intercepted by various 
                         subsidiary faults. Transtensional strike slip regime is recorded 
                         by both left and right-lateral faults, with the wetlands 
                         corresponding to subsiding areas owned to conjugate strike slip 
                         faults. Habitat fragmentation and other ecological processes 
                         promoted by tectonic deformation would have impacted the overlying 
                         forest canopy by changing its structure due to tree mortality. The 
                         complex compartmentalization imposed by active tectonics would 
                         have exposed the ground to contrasting hydrological conditions, 
                         which controlled the rate of tree mortality within the wetlands. 
                         We pose that the tectonic disturbance and associated tree 
                         mortality documented in the middle Negro River evidence 
                         contemporary seismicity within the intracratonic Brazilian 
                         Amazonia.",
                  doi = "10.1016/j.geomorph.2018.12.028",
                  url = "http://dx.doi.org/10.1016/j.geomorph.2018.12.028",
                 issn = "0169-555X",
             language = "en",
           targetfile = "rossetti_neotectonics.pdf",
        urlaccessdate = "27 abr. 2024"
}