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Item type:Publication, First record of OSL‐dated fluvial sands in a tropical Andean cave reveals rapid late Quaternary tectonic uplift(Wiley, 2020-12-05)Abstract We present the first results of OSL‐dated fluvial sands extracted from a riverside cave in the tropical Andes. The excellent agreement between the ages of the various samples allowed the calculation of a late Quaternary valley incision rate forced by ongoing uplift of an active Subandean fault‐propagation fold in NE Peru. A structural cross‐section was constructed to understand the relationship between the geometry of the fault‐propagation fold, historical damaging earthquakes and the cave system. The calculated uplift rate is 2.3 to 2.6 mm a−1 over the past 70 ka and can be directly linked to active propagation of west‐verging basement thrusts. It is similar to uplift rates calculated from fluvial terraces in the Subandes of Colombia and Venezuela. The results will help to better assess the seismic hazard and confirm that OSL dating of fluvial sands in caves is a powerful tool to quantify uplift rates of active mountain fronts. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A Performance Comparison of SRTM v. 3.0, AW3D30, ASTER GDEM3, Copernicus and TanDEM-X for Tectonogeomorphic Analysis in the South American Andes(Elsevier B.V., 2023-07-01)Digital Elevation Models (DEMs) are widely used to assess the degree of tectonic activity in mountainous landscapes. But hardly ever have quality assessments of DEMs been carried out to assess their suitability for the calculation of the most widely used tectonogeomorphic indices. For that reason, we have analysed the five most commonly used DEMs for two tectonic basins in the Peruvian Andes. Those are the 30-m SRTM v.3.0, AW3D30, ASTER GDEM3, Copernicus and the 12-m TanDEM-X. The analysed indices are related to the characteristics of 22 drainage networks and we included a vertical accuracy assessment based on available GNSS control points. Copernicus produced the smoothest river profiles followed by AW3D30 and TanDEM-X. River profiles from the rainforest-covered Moyobamba tectonic basin were noisier than those from the more arid Huancayo tectonic basin. All DEMs performed statistically similar in the calculation of drainage basin area, θ, m/n, Ksn and the Hypsometric Integral. Copernicus and TanDEM-X generated the longest drainage networks. TanDEM-X showed the highest vertical accuracy with a RMSE of 3.174 m in the rugged Huancayo basin, and 2.172 in the Moyobamba basin, followed by AW3D30. Copernicus showed very uneven results between both tectonic basins. TanDEM-X allowed the most detailed mapping of fluvial and tectonic landforms, with the identification of six out of seven fluvial terraces, while Copernicus performed best of all 30-m DEMs. The overall best performing DEMs were Copernicus and TanDEM-X, closely followed by AW3D30. ASTER GDEM3 generally performed worst. In general, there was more statistical variability between DEMs in the more rugged Huancayo basin, suggesting that steeper slopes had a significant impact on the calculated indices. Our results provide a clear guideline for the scientific community of which DEMs to pick for the calculation of the various tectonogeomorphic indices. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Revealing inherited Precambrian crustal structure of the Vaupés Arch in the Colombian Amazonian Craton using teleseismic receiver functions and gravity spectral analysis(Taylor and Francis Ltd., 2026-01-01)Uncovering the crustal structure is essential for understanding the tectonic history of a region. However, such analysis in remote and poorly exposed areas such as the Colombian Amazonian Craton is often challenging due to limited geological and geophysical data. This research presents a new regional Moho model for the southeastern Amazonian region in Colombia, encompassing the Sub-Andean basins and part of the northwestern Amazonian Craton. We combined Moho depth estimates from gravity analysis, using a 2D radially averaged power spectrum, with those derived from receiver functions using the H-k stacking technique at five seismic stations. The resulting Moho map reveals notable crustal heterogeneities along the NW-SE trending Vaupés Arch, with depths ranging from 33 to 51 km. In the light of the limited evidence of Phanerozoic tectonic activity in the Colombian Amazonian Craton and the inconsistency between Moho depths and present-day topography as indicated by an isostatic model, we suggest that the observed Moho depth variations likely reflect a polyphase history of Precambrian contraction and extension in the NW Amazonian Craton. This history is linked to Neoproterozoic rifting during Rodinia's break-up, which led to discontinuous crustal thinning in crustal domains previously thickened by Paleo-Mesoproterozoic orogenic pulses and the compressional phases of the Putumayo Orogen. Our findings underscore the value of integrating geophysical methods to better understand the tectonic evolution of cratonic regions with sparse surface data.