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Topics and sessions > Topic V - Geo-hazardV-1-Advances in lacustrine paleo-earthquake researchConveners
Ruptures on plate boundaries, intraslab, and crustal faults generate ground motions and surface deformation that can significantly impact lake sediments. These events can also trigger secondary effects, such as mass movements and subsequent tsunamis, leaving distinct sedimentary imprints. The response of lake systems to seismic shaking is influenced by seismic wave properties (frequency, amplitude, duration) and the geomechanical characteristics of the substrate (grain size, composition, shear strength). Despite the increasing availability of lake sediment records for documenting past earthquakes, significant challenges remain in identifying and interpreting these signals. This session aims to advance lacustrine paleoseismology by exploring innovative methodologies and interdisciplinary approaches—including sediment analysis, seismology, and numerical modeling—to refine our understanding of past earthquakes. Topics of interest include, but are not limited to: (1) advances in detecting and interpreting seismic deposits, (2) insights from intraplate and low-relief basin settings, (3) the integration of terrestrial (e.g., fault trenching) and historical earthquake data to improve interpretations from lake records, and (4) the role of lake sediment data in probabilistic seismic hazard assessments. By bridging disciplines, we seek to enhance the reliability of paleoseismic reconstructions and improve our ability to assess seismic hazards from lacustrine archives.
V-2-Cascading geohazards in lakes and fjords: Documentation, Modelling and Monitoring Conveners
This session will explore cascading geohazards in lakes and fjords, focusing on their documentation, modeling, and monitoring. Topics will include landslides, sediment flows, tsunamis, glacial lake outburst floods (GLOF), as well as the impact of these events on surrounding ecosystems and communities. We invite contributions that enhance our understanding of these transdisciplinary processes. The session aims to foster collaboration among researchers of various disciplines related to Limnogeology, including seismology, sedimentology, glaciology, hydraulic engineering, and engineering geology.
V-3-Paleofloods – Tribute to Bruno Wilhelm Conveners
Flooding is the most common type of climate-related disaster, resulting in major economic losses and affecting several billion people globally. In a context of warming climate these numbers are expected to grow according to the projected increases in heavy precipitation. Thus, assessing the evolution of flood risks in warmer climates is a key public interest issue. The use of natural archives and retrospective approaches, in particular those based on lake sediments, seems to be one of the best ways of supplementing the information derived from flood risk projections, which still involve considerable uncertainties. The aim of this session is therefore to bring together the whole community of sedimentologists and palaeoclimatologists working on reconstructing the evolution of hydrological conditions on a local or regional scale from lake sediment archives. Innovative, multiproxy and multi-archive approaches, or approaches that endeavour to provide chronicles of the intensity of precipitation events, will be particularly appreciated. This session is supported by the PAGES working group Flood (https://pastglobalchanges.org/science/wg/floods/intro). Contributions from students or young researchers are encouraged. A prize, in memory of Bruno Wilhelm, for the most outstanding contribution will be awarded at the end of the session. A workshop on the synthesis of reconstructions of the frequency and intensity of floods in Europe and around the world is also envisaged.
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