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1. Fire hazard modulation by long-term dynamics in land cover and dominant forest type in eastern and central Europe

Author

A. Feurdean, B. Vannière, W. Finsinger, D. Warren, S. C. Connor, M. Forrest, J. Liakka, A. Panait, C. Werner, M. Andrič, P. Bobek, V. A. Carter, B. Davis, A.-C. Diaconu, E. Dietze, I. Feeser, G. Florescu, M. Gałka, T. Giesecke, S. Jahns, E. Jamrichová, K. Kajukało, J. Kaplan, M. Karpińska-Kołaczek, P. Kołaczek, P. Kuneš, D. Kupriyanov, M. Lamentowicz, C. Lemmen, E. K. Magyari, K. Marcisz, E. Marinova, A. Niamir, E. Novenko, M. Obremska, A. Pędziszewska, M. Pfeiffer, A. Poska, M. Rösch, M. Słowiński, M. Stančikaitė, M. Szal, J. Święta-Musznicka, I. Tanţău, M. Theuerkauf, S. Tonkov, O. Valkó, J. Vassiljev, S. Veski, I. Vincze, A. Wacnik, J. Wiethold, T. Hickler, Palaeo-ecologie, Coastal dynamics, Fluvial systems and Global change, Senckenberg biodiversität und klima forschungszentrum (BIK-F), Forschungsinstitut Senckenberg (SGN), Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226, Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Goethe-Universität Frankfurt am Main-Senckenberg – Leibniz Institution for Biodiversity and Earth System Research - Senckenberg Gesellschaft für Naturforschung, Leibniz Association-Leibniz Association, Center for Marine Biodiversity and Conservation, Scripps Institution of Oceanography, University of California [San Diego] (UC San Diego), University of California-University of California, Nansen Environmental and Remote Sensing Center [Bergen] (NERSC), Babes-Bolyai University [Cluj-Napoca] (UBB), Universität Heidelberg [Heidelberg], Institut za arheologijo (ZRC SAZU), Znanstvenoraziskovalni center SAZU - Institut za arheologijo, Institute of Botany of the Czech Academy of Sciences (IB / CAS), Czech Academy of Sciences [Prague] (CAS), Department of Botany, Faculty of Science, Charles University, Institute of Earth Surface Dynamics [Lausanne], Université de Lausanne (UNIL), GeoForschungsZentrum - Helmholtz-Zentrum Potsdam (GFZ), Institut fûr Ur- und Frühgeschichte, Christian-Albrechts-Universität zu Kiel (CAU), Adam Mickiewicz University in Poznań (UAM), Department of Geography, University of Liverpool, Brandenburgisches Landesamt für Denkmalpflege und Archäologisches Landesmuseum, Institute of Geoecology and Geoinformation, University of Oxford, Oxford, United Kingdom, Department of Biogeography and Paleoecology, Laboratory of Wetland Ecology and Monitoring, Faculty of Geographical and Geological Sciences, Adam Mickiewicz University, Helmholtz-Zentrum Geesthacht (GKSS), GINOP Sustainable Ecosystem Research Group, MTA Centre for Ecological Research [Tihany], Hungarian Academy of Sciences (MTA)-Hungarian Academy of Sciences (MTA), Department of Environmental and Landscape Geography, Eötvös Loránd University (ELTE), MTA-MTM-ELTE Research Group for Paleontology, Eötvös Loránd University (ELTE)-Hungarian Academy of Sciences (MTA), Laboratory of Wetland Ecology and Monitoring, Faculty of Geographical and Geological Sciences, Department of Botany, Sofia University 'Sv. Kliment Ohridski', Institute of Geological Sciences, Polish Academy of Sciences, Polska Akademia Nauk = Polish Academy of Sciences (PAN), Department of Plant Ecology, Gdansk University, University of Gdańsk (UG), Institute of Geology, University of Bern, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Nature Research Centre [Vilnius], Department of Palaeobotany, Institute of Biology, Białystok University of Technology, Institute of Botany and Landscape Ecology, Universität Greifswald - University of Greifswald, University of Sofia, Institute of Geology at Tallinn, Tallinn University of Technology (TTÜ), W. Szafer Institute of Botany, Institut national de recherches archéologiques préventives (Inrap), PAGES Global Charcoal Database, ANR-09-CEPL-0004,OBRESOC,Un observatoire rétrospectif d'une société archéologique: La trajectoire du néolithique Rubané.(2009), Laboratoire Chrono-environnement (UMR 6249) (LCE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS), University of California (UC)-University of California (UC), Universität Heidelberg [Heidelberg] = Heidelberg University, Charles University [Prague] (CU), Université de Lausanne = University of Lausanne (UNIL), Sofia University 'St. Kliment Ohridski', and Софийски университет = Sofia University

Subjects
KA BP, 010504 meteorology & atmospheric sciences, IMPACT, Climate, lcsh:Life, 580 Plants (Botany), 01 natural sciences, [SDV.SA.SF]Life Sciences [q-bio]/Agricultural sciences/Silviculture, forestry, ddc:550, Geosciences, Multidisciplinary, ComputingMilieux_MISCELLANEOUS, Holocene, ddc:910, Biomass (ecology), Ecology, lcsh:QE1-996.5, Geology, Vegetation, [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics, [SDV.BIBS]Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], Management, SUMMER, Physical Sciences, CHARCOAL RECORDS, Life Sciences & Biomedicine, 010506 paleontology, Evolution, [SDE.MCG]Environmental Sciences/Global Changes, REGIMES, Environmental Sciences & Ecology, Land cover, Behavior and Systematics, lcsh:QH540-549.5, MANAGEMENT, Temperate climate, Regimes, Sedimentary, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences, Earth-Surface Processes, Forest floor, Science & Technology, Fire regime, Land use, 15. Life on land, [SDE.ES]Environmental Sciences/Environmental and Society, CLIMATE, MODEL, lcsh:Geology, SEDIMENTARY, lcsh:QH501-531, Earth sciences, 13. Climate action, Environmental science, VEGETATION, Physical geography, lcsh:Ecology, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Model
Abstract

Wildfire occurrence is influenced by climate, vegetation and human activities. A key challenge for understanding the risk of fires is quantifying the mediating effect of vegetation on fire regimes. Here, we explore the relative importance of Holocene land cover, land use, dominant functional forest type, and climate dynamics on biomass burning in temperate and boreo-nemoral regions of central and eastern Europe over the past 12 kyr. We used an extensive data set of Holocene pollen and sedimentary charcoal records, in combination with climate simulations and statistical modelling. Biomass burning was highest during the early Holocene and lowest during the mid-Holocene in all three ecoregions (Atlantic, continental and boreo-nemoral) but was more spatially variable over the past 3–4 kyr. Although climate explained a significant variance in biomass burning during the early Holocene, tree cover was consistently the highest predictor of past biomass burning over the past 8 kyr. In temperate forests, biomass burning was high at ∼45 % tree cover and decreased to a minimum at between 60 % and 70 % tree cover. In needleleaf-dominated forests, biomass burning was highest at ∼ 60 %–65 % tree cover and steeply declined at >65 % tree cover. Biomass burning also increased when arable lands and grasslands reached ∼ 15 %–20 %, although this relationship was variable depending on land use practice via ignition sources, fuel type and quantities. Higher tree cover reduced the amount of solar radiation reaching the forest floor and could provide moister, more wind-protected microclimates underneath canopies, thereby decreasing fuel flammability. Tree cover at which biomass burning increased appears to be driven by warmer and drier summer conditions during the early Holocene and by increasing human influence on land cover during the late Holocene. We suggest that long-term fire hazard may be effectively reduced through land cover management, given that land cover has controlled fire regimes under the dynamic climates of the Holocene.

Published
2020
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2. Fire risk modulation by long-term dynamics in land cover and dominant forest type in Eastern and Central Europe

Author

Angelica Feurdean, Boris Vannière, Walter Finsinger, Dan Warren, Simon C. Connor, Matthew Forrest, Johan Liakka, Andrei Panait, Christian Werner, Maja Andrič, Premysl Bobek, Vachel A. Carter, Basil Davis, Andrei-Cosmin Diaconu, Elisabeth Dietze, Ingo Feeser, Gabriela Florescu, Mariusz Gałka, Thomas Giesecke, Susanne Jahns, Eva Jamrichová, Katarzyna Kajukało, Jed Kaplan, Monika Karpińska-Kołaczek, Piotr Kołaczek, Petr Kuneš, Dimitry Kupriyanov, Mariusz Lamentowicz, Carsten Lemmen, Enikö K. Magyari, Katarzyna Marcisz, Elena Marinova, Aidin Niamir, Elena Novenko, Milena Obremska, Anna Pędziszewska, Mirjam Pfeiffer, Anneli Poska, Manfred Rösch, Michal Słowiński, Miglė Stančikaitė, Marta Szal, Joanna Święta-Musznicka, Ioan Tanţău, Martin Theuerkauf, Spassimir Tonkov, Orsolya Valkó, Juri Vassiljev, Siim Veski, Ildiko Vincze, Agnieszka Wacnik, Julian Wiethold, Thomas Hickler, Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Goethe-Universität Frankfurt am Main-Senckenberg – Leibniz Institution for Biodiversity and Earth System Research - Senckenberg Gesellschaft für Naturforschung, Leibniz Association-Leibniz Association, Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226, Center for Marine Biodiversity and Conservation, Scripps Institution of Oceanography, University of California [San Diego] (UC San Diego), University of California-University of California, Nansen Environmental and Remote Sensing Center [Bergen] (NERSC), Babes-Bolyai University [Cluj-Napoca] (UBB), Heidelberg University, Institut za arheologijo (ZRC SAZU), Znanstvenoraziskovalni center SAZU - Institut za arheologijo, Institute of Botany of the Czech Academy of Sciences (IB / CAS), Czech Academy of Sciences [Prague] (CAS), Department of Botany, Faculty of Science, Charles University, Institute of Earth Surface Dynamics [Lausanne], Université de Lausanne (UNIL), GeoForschungsZentrum - Helmholtz-Zentrum Potsdam (GFZ), Institut fûr Ur- und Frühgeschichte, Christian-Albrechts-Universität zu Kiel (CAU), Adam Mickiewicz University in Poznań (UAM), Department of Palynology and Climate Dynamics, Georg-August-University [Göttingen]-Georg-August-University [Göttingen], Brandenburgisches Landesamt für Denkmalpflege und Archäologisches Landesmuseum, Institute of Geoecology and Geoinformation, ARVE, Laboratory of Wetland Ecology and Monitoring, Faculty of Geographical and Geological Sciences, Helmholtz-Zentrum Geesthacht (GKSS), MTA-MTM-ELTE Research Group for Paleontology, Eötvös Loránd University (ELTE)-Hungarian Academy of Sciences (MTA), GINOP Sustainable Ecosystem Research Group, MTA Centre for Ecological Research [Tihany], Hungarian Academy of Sciences (MTA)-Hungarian Academy of Sciences (MTA), Department of Environmental and Landscape Geography, Eötvös Loránd University (ELTE), Landesdenkmalamt, Baden-Württemberg, Institute of Geological Sciences, Polish Academy of Sciences, Polska Akademia Nauk = Polish Academy of Sciences (PAN), Department of Plant Ecology, Gdansk University, University of Gdańsk (UG), Senckenberg biodiversität und klima forschungszentrum (BIK-F), Forschungsinstitut Senckenberg (SGN), Institute of Geology, University of Bern, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Nature Research Centre [Vilnius], Department of Palaeobotany, Institute of Biology, Białystok University of Technology, Institute of Botany and Landscape Ecology, Universität Greifswald - University of Greifswald, University of Sofia, Institute of Geology at Tallinn, Tallinn University of Technology (TTÜ), Department of Palaeobotany, W. Szafer Institute of Botany, Polish Academy of Sciences, Institut national de recherches archéologiques préventives (Inrap), Archéologie, Terre, Histoire, Sociétés [Dijon] (ARTeHiS), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-Ministère de la Culture et de la Communication (MCC), German Research Foundation (grant nos. FE-1096/4-1 and FE-1096/6-1). Additional financial support also came from the Slovenian Research Agency (grant nos. P6-0064 and J7-6857), the UEFISCDI in Romania (grant no. PN-III-P4-ID-PCE-2016-0711), the Research Council of Lithuania (grant no. S-MIP-17-133), the Swiss Government Excellence Postdoctoral Scholarship (grant no. FIRECO 2016.0310), the National Science Centre in Poland (grant nos. 2015/17/B/ST10/01656 and 2015/17/B/ST10/03430), the Czech Science Foundation (grant nos. 16-06915S, 19-14271Y and GA14-22658S), the Estonian Research Council (grant no. PRG323), the Czech Academy of Sciences (grant no. RVO 67985939), the ANR OBRESOC project (grant no. ANR 09-CEP-004-01), and the Hungarian National Research, Development and Innovation Office., PAGES Global Charcoal Database, ANR-09-CEPL-0004,OBRESOC,Un observatoire rétrospectif d'une société archéologique: La trajectoire du néolithique Rubané.(2009), Laboratoire Chrono-environnement (UMR 6249) (LCE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS), University of California (UC)-University of California (UC), Charles University [Prague] (CU), Université de Lausanne = University of Lausanne (UNIL), Georg-August-University = Georg-August-Universität Göttingen-Georg-August-University = Georg-August-Universität Göttingen, Софийски университет = Sofia University, and Ministère de la Culture et de la Communication (MCC)-Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
0106 biological sciences, biomass burning, 010504 meteorology & atmospheric sciences, Holocene, [SDE.MCG]Environmental Sciences/Global Changes, Human impact, 15. Life on land, [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics, 01 natural sciences, [SDV.BIBS]Life Sciences [q-bio]/Quantitative Methods [q-bio.QM], [SDE.ES]Environmental Sciences/Environmental and Society, Fire hazard, [SDV.SA.SF]Life Sciences [q-bio]/Agricultural sciences/Silviculture, forestry, 13. Climate action, tree cover, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, 010606 plant biology & botany, 0105 earth and related environmental sciences
Abstract

Wildfire occurrence is influenced by climate, vegetation and human activities. A key challenge for understanding fire-climate-vegetation interactions is to quantify the effect vegetation has in mediating fire regime. Here, we explore the relative importance of Holocene land cover and dominant functional forest type, and climate dynamics on biomass burned in temperate and boreo-nemoral regions of Central and Eastern Europe over the past 12 ka BP years. We used an extensive data set of Holocene pollen and sedimentary charcoal records, in combination with climate simulations and novel statistical modelling. Biomass burned was highest during the early Holocene and lowest during the mid Holocene in all three ecoregions, but diverged more markedly over the past 3–4 ka BP. Although the climate was an important driver of fire hazard during the warm and dry early Holocene, tree cover was consistently the strongest predictor of past biomass burning. In temperate forests, biomass burned was high at ~ 45 % tree cover and decreased strongly towards 60 % tree cover. In needleleaf dominated forests, biomass burned was highest at ~ 60–65 % tree cover and abruptly declined at > 65 % tree cover. Biomass burned also increased when arable lands and grasslands reached ~ 15–20 %, although this relationship was highly dynamic depending on land use intensity throughout ignition and fuel type and availability. Our observations cover the full range of Holocene climate variability and land cover changes and illustrates that percentages of land cover is a key predictor of the probability of fire occurrence over timescales of centuries to millennia. We suggest that long-term fire risk may be effectively reduced through land cover management, given that land cover has controlled fire regimes under the dynamic climates of the Holocene.

Published
2019
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3. 6600 years of earthquake record in the Julian Alps (Lake Bohinj, Slovenia)

Author

Pierre Sabatier, Christian Crouzet, Gerhard Daut, Anne-Lise Develle, Fabien Arnaud, Bruno Wilhelm, Andrej Šmuc, Maja Andrič, François Demory, Jean Louis Reyss, Ulrich von Grafenstein, William Rapuc, Edouard Régnier, Emmanuel Chapron, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut za arheologijo (ZRC SAZU), Znanstvenoraziskovalni center SAZU - Institut za arheologijo, Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), Géographie de l'environnement (GEODE), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J), University of Ljubljana, Laboratoire d'étude des transferts en hydrologie et environnement (LTHE), Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique de Grenoble (INPG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Géochrononologie Traceurs Archéométrie (GEOTRAC), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Institut für Geographie, Friedrich-Schiller-Universität Jena, Department of Geology, University of Ljubljana, Slovenia, Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Océan et Interfaces (OCEANIS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany], Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Scientific Research Centre of the Slovenian Academy of Sciences and Arts (ZRC SAZU), Institut für Geologie und Palaeontologie [Tübingen], Eberhard Karls Universität Tübingen = Eberhard Karls University of Tuebingen, Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Université Toulouse - Jean Jaurès (UT2J)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Recherche pour le Développement (IRD)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut fur Geologie und Palaeontologie, Arbeitsbereich Geophysik, and Eberhard Karls Universität Tübingen

Subjects
Return period, Earthquake, 010504 meteorology & atmospheric sciences, Stratigraphy, [SDE.MCG]Environmental Sciences/Global Changes, Slovenia, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Mass wasting, 010502 geochemistry & geophysics, 01 natural sciences, C2FN, Earthquake chronicle, lake sensitivity, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, Lake bohinj, [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology, Holocene, 0105 earth and related environmental sciences, Julian Alps, [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, Sediment, Geology, [SHS.GEO]Humanities and Social Sciences/Geography, lake sediment, 13. Climate action, [SDE]Environmental Sciences, Period (geology), Erosion, Sedimentary rock, Physical geography, geographic locations, Chronology
Abstract

International audience; Sequences of lake sediments often form long and continuous records that may be sensitive recorders of seismic shaking. A multi-proxy analysis of Lake Bohinj sediments associated with a wellconstrained chronology was conducted to reconstruct Holocene seismic activity in the Julian Alps (Slovenia). A seismic reflection survey and sedimentological analyses identified 29 homogenite-type deposits related to mass wasting deposits. The most recent homogenites can be linked to historical regional earthquakes (i.e. 1348 AD, 1511 AD and 1690 AD) with strong epicentral intensity [greater than ‘damaging’ (VIII) on the Medvedev–Sponheuer–Karnik scale]. The correlation between the historic earthquake dataset and the homogenites identified in a core isolated from local stream inputs, allows interpretation of all similar deposits as earthquake related. This work extends the earthquake chronicle of the last 6600 years in this area with a total of 29 events recorded. The early Holocene sedimentary record is disturbed by a seismic event (6617 ± 94 yr cal BP) that reworked previously deposited sediment and led to a thick sediment deposit identified in the seismic survey. The period between 3500 to 2000 yr cal BP is characterized by a major destabilization in the watershed by human activities that led to increases in erosion and sedimentation rates. This change increased the lake’s sensitivity to recording an earthquake (earthquake-sensitivity threshold index) with the occurrence of 72 turbidite-type deposits over this period. The high turbidite frequency identified could be the consequence of this change in lake earthquake sensitivity and thus these turbidites could be triggered by earthquake shaking, as other origins are discarded. This study illustrates why it is not acceptable to propose a return period for seismic activity recorded in lake sediment if the sedimentation rate varies significantly.

Published
2018
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