ORCID Profile
0000-0002-9236-8130
Current Organisations
Delft University of Technology
,
Technische Universiteit Delft
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Publisher: Geological Society of America
Date: 10-01-2023
DOI: 10.1130/B36557.1
Abstract: We present the late Holocene eruption history of the poorly known Doña Juana volcanic complex, in SW Colombia, which last erupted in the twentieth century. This represents a case study for potentially active volcanism in the rural Northern Andes, where tropical climate conditions and a fragmented social memory blur the record of dormant volcanoes. We reconstructed the volcanic stratigraphy of the central-summit vent area by integrating new mapping at 1:5000 scale with radiocarbon ages, sedimentology analysis, and historical chronicles. Our results revealed cyclic transitions from lava-dome growth phases and collapse to explosive Vulcanian and possibly subplinian phases. Pyroclastic density currents were generated by dome collapse producing block-and-ash flows or by pyroclastic fountain/column collapse and were rapidly channelized into the deeply incised fluvial valleys around the volcano summit. The pyroclastic density currents were ∼4−10 × 106 m3 in volume and deposited under granular flow− or fluid escape−dominated depositional regimes at high clast concentrations. In places, more dilute upper portions reached a wider areal distribution that affected the inhabited areas on high depositional terraces. The coefficient of friction (ΔH/L) is higher for block-and-ash flows and dense lava−bearing fountain/low-column-collapse pyroclastic density currents compared to pumice-bearing, column-collapse pyroclastic density currents. Associated mass-wasting processes included syneruptive and intereruptive debris flows, with the last one documented in 1936 CE.
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-20460
Abstract: & & Volcanic habitats host a dynamic environment for sudden and long-lasting relationships between nature and culture, becoming an archetypal case for the study of resilient communities. In these habitats, the study of the occurring phenomena is often addressed independently and in disciplinary isolation, focusing on the uncertainty and contingency of geohazards, the abrupt and recurrent resetting of biophysical conditions due to natural disturbances, or the intrinsic repercussions on the anthropogenic memory. Under this perspective, mass-movements within a volcanic habitat can be addressed as a complex system built over various generations of interacting and interdependent human societies, ecological systems, climate and geological processes. Understanding this multivariable and multi-scalar coexistence becomes central in how mass-movements are perceived. In this work, we propose a transdisciplinary approach for the formulation and design of alternative strategies in the mitigation of mass-movements hazards, by responsibly collaborating between geoscientists, social scientists, and local actors.& br& Mass-movement mitigation strategies rarely take into account the cultural relationship of the inhabitants with their territories and the complexity of the local knowledge and capabilities of the communities to resolve their condition [2]. This limits the effectiveness in the response capacity and resilience of communities and ecosystems to extreme events [2]. Through this research, we aim at finding ways to democratize knowledge, and change academic practices within a geoethical context, recognizing and valuing the local perspectives. In this work, we study an area within the Do& #241 a Juana-Cascabel volcanic-complex, located in SW Colombia, and focus on the processes in the vicinity to the Humadal stream and neighbouring communities. This stream is recognized as the main preoccupation of the inhabitants with the recent occurrence of mass-movements in its basin. We address this issue through a team consisting of key local social actors and researchers in anthropology, archaeology, biology, design, engineering, geology, pedagogy, and pedology. We collaborate within a Historical Ecology framework, aiming to the empowerment of sociological resilience-based decision making [3]. This work started with the site recognition, mapping the geological, biological, and social settings. In parallel, we listened and valued the local knowledge about physical geography, ecosystems, and mass-movements in an active volcanic habitat, and merge it with the scientific knowledge. Moreover, this local knowledge enlighted key aspects on the interaction between the inhabitants and the State& #8217 s agencies and governmental processes, which underlay the dynamics of any reliable policy and sustainibile process.& & br& In this particular site, we identified the organizational capacity to work on reforestation, road maintenance, and weaving as fundamental capabilities for connecting with the design, potential implementation, and sustainability of a set of potential mitigation strategies. With this case study, we invite the multiple actors involved in disaster risk reduction to find common languages beyond disciplinary boundiaries aiming to horizontalize knowledge with the local actors in risk. Through this excercise, we avoid the victimization of the communities, reduce power relationships, and empower resilience.& & & & [1]Martin, Martin & Kent, (2009). Journal of environmental management, 91(2), 489-498.& br& [2]Gaillard, (2008). Journal of volcanology and geothermal research, 172(3-4), 315-328.& br& [3]Brierley, (2010). & Area, 42(1), 76-85.& &
Publisher: Informa UK Limited
Date: 08-2022
Publisher: Springer Science and Business Media LLC
Date: 28-08-2019
Publisher: Springer Science and Business Media LLC
Date: 05-03-2021
Location: Austria
No related grants have been discovered for Miguel Angel Cabrera.