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EGU2014 TS2.4 Advances in paleostress/strain reconstructions (PICO presentation) Dear colleagues and list members, As our session on Paleostress & Paleostrain Reconstructions at the EGU General Assembly of 2013 attracted a good number of presentations, we are pleased to reconvene for a new edition at the General Assembly 2014 (27 April - 02 May). This time, it will be a PICO interactive session (Presenting Interactive Content). Following experiments at the 2013 General Assembly, EGU decided to feature PICO presentations more prominently next year (2014). Our session has been selected by the Tectonics and Structural Geology Programme committee to promote this new concept. A PICO session consists of 2 minute plenary introductions followed by 1 hour discussion on a dedicated screen, organized in blocks of 20 presentations (so there are 20 screens – the digital and interactive analogue of a poster combined with an oral presentation). There is no distinction between Poster and Orals anymore and every contributors will be offered the same opportunity for presenting their results. It is an innovative way of disseminating scientific results and we can be proud that our session has been selected for experimenting with the PICO. An additional advantage of a PICO presentation is that after submitting one first-author abstract for a PICO, authors can still submit one first-author abstract with oral preference and as many poster abstracts as first author as they want. PICO offers thus a new possibility to present your results, in addition to the existing oral and poster way. Guidelines for PICO – Presenting Interactive Content can be found at: http://www.egu2014.eu/pico.html An example of a PICO presentation given by Stolk et al is available at: http://www.egu2014.eu/egu2014_pico_power_point.pptx. Please consider submitting an abstract to the European Geosciences Union General Assembly 2014 (27 April - 02 May) for the session: TS2.4 Advances in paleostress/strain reconstructions in tectonic studies: methods, applications, perspectives (PICO Session) http://meetingorganizer.copernicus.org/EGU2014/session/14729 Abstract submission: http://meetingorganizer.copernicus.org/EGU2014/abstractsubmission/14729 Conveners: Damien Delvaux, Royal Museum for Central Africa, Belgium Olivier Lacombe, Université Pierre et Marie Curie, Paris VI, France Giulio Viola, Geological Survey of Norway, Trondheim, Norway Daniel Koehn, University of , Glasgow, UK Tectonic stress in the Earth’s crust can never be observed directly but its in depth understanding is of fundamental importance as it determines how rocks deform, fracture and fold patterns develop and faults nucleate and behave. A refined understanding of tectonic stresses also plays an important role toward seismic hazard assessment as it governs the seismotectonic triggering of active faults. Stress can be studied using brittle deformation structures as natural gauges as those are the direct result of the stress field(s) that the rock experienced and accommodated. A good mechanical understanding of fault and fracture formation is a pre-requisite for fault-kinematic analysis of fault-slip data. Different methods allow to reconstruct the paleostress field from geological data of the present-day stress field from earthquake focal mechanisms. They constrain mainly reduced stress tensors, although a few provide differential stresses, and even fewer both quantities. The session aims at making the point on the advances of the methods of paleo-stress/strain analysis and evaluate how paleo-stress/strain reconstructions contribute to tectonic studies, of both stress orientations and magnitudes. We would like to discuss keys and pitfalls of paleostress reconstructions, to move forward the long-lived debate on stress vs. strain vs. kinematic interpretation of fault-slip data and other geological indicators, and estimate to what extent paleostresses can be compared to modern stresses in terms of distribution in time and space and of geological and physical meanings. We emphasize also the need for new improved techniques and for discussing how existing methods can be more thoughtfully combined and applied. Our ultimate wish is to bring together researchers who work on these topics. We welcome a wide range of contributions focusing on both methodological aspects and regional applications. Special attention shall be paid to the use of hybrid fractures and negative information in paleostress reconstructions, separation of heterogeneous data sets in regional polyphase brittle analysis, reactivation mechanisms and strain partitioning in the brittle regime, as well as modeling studies of stress states at the local or regional scale. Deadlines is January 19 for Receipt of Abstracts.