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EGU 2018 General Assembly
13/04/2018 @ 8:30 AM - 7:00 PM
Session TS5.1/NH4.8/SM3.02 “Paleoseismicity, active faulting, surface deformation, and the implications on seismic hazard assessment (Fault2SHA)”
Convener: Esther Hintersberger
Co-Conveners: Angela Landgraf , Romain Le Roux-Mallouf , Silke Mechernich , Laura Peruzza , Oona Scotti , Kris Vanneste
María Ortuno/Eulàlia Masana (U Barcelona)
Austin Elliott (U Oxford)
Neta Wechsler (U Tel-Aviv)
The study of active faults and surface deformation continues to add significant contributions to our understanding of earthquake mechanisms and the assessment of related seismic hazard.
Active faulting shapes and deforms the Earth’s surface and their records are documented in young sediments and in the landscape geomorphology. Field studies of recent earthquake ruptures help not only constraining earthquake source parameters but also the identification of previously unknown active structures. The insights gleaned from recent earthquakes have been shown to be applicable to study past earthquakes. Paleoseismology and related disciplines such as paleogeodesy and paleotsunami investigations are the primary tools to establish earthquake records that are long enough to determine recurrence intervals and long-term deformation rates for active faults. Multidisciplinary data sets accumulated over the years have brought unprecedented constraints on the size and timing of past earthquakes, and allow deciphering shorter-term variations in fault slip rates or seismic activity rates, as well as the interaction of single faults within fault systems. Based on this wide and very heterogeneous knowledge of seismogenic faults, a variety of approaches have been developed to transfer earthquake-fault geology into fault models suitable for probabilistic seismic hazard assessment (SHA). This session aims to link paleoseismic studies (remote sensing, field geology, lab analysis) with modeling approaches (crustal deformation modeling, fault modeling, seismic hazard assessment).
In this session, we highly welcome contributions (i) describing and critically discussing methodologies implemented in the field to collect active faults data and (ii) describing how such data is transferred into fault models for SHA. We are particularly interested in studies applying new and innovative methodologies or multidisciplinary approaches. We aim to assemble a broad program bringing together studies dealing with on-land, lake and offshore environments, and applying a variety of traditional methods (paleoseismic trenching, high-resolution coring, geophysical imaging, tectonic geomorphology, and remote sensing) as well as fault2SHA studies that propose methodologies to characterize seismic hazard integrating fault data with seismological and geodetic data.