Simon DaoutUniversity of Lorraine | UdL · CRPG - Centre de Recherches Pétrographiques et Géochimiques
Doctor of Geosciences
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
Citations since 2017
23 Research Items
An important part of my research consists of developing synthetic aperture radar (InSAR) methodologies to measure slow surface displacements (few mm/yr) associated with various processes (active tectonics, surface processes, permafrost, etc...). Another research interest is to reconcile long-term (geological or tectonic) and short-term (geodetic) tectonic models. I am particularly interested in the link between active fault behavior and fault geometry.
Skills and Expertise
October 2014 - present
- Research Assistant
- Remote Sensing and SIG GPS Programming Seismic Imaging
The launches of the Sentinel‐1 synthetic aperture radar satellites in 2014 and 2016 started a new era of high‐resolution velocity and strain rate mapping for the continents. However, multiple challenges exist in tying independently processed velocity data sets to a common reference frame and producing high‐resolution strain rate fields. We analyze...
The Main Köpetdag Fault (MKDF) is a predominantly right-lateral strike-slip fault that dissects the northern edge of the Köpetdag mountains of Turkmenistan and Iran. The fault represents the northernmost expression of deformation from the Arabia-Eurasia collision to the east of the Caspian Sea, and plays an important role facilitating the motion of...
Questions regarding the development of folds and their interactions with the seismic faults within thrust systems remain unanswered. However, estimating fault slip and earthquake hazards using surface observations and kinematic models of folding requires an understanding of how the shortening is accommodated during the different phases of the earth...
Inferring the geometry and evolution of an earthquake sequence is crucial to understand how fault systems are segmented and interact. However, structural geological models are often poorly constrained in remote areas and fault inference is an ill-posed problem with a reliability that depends on many factors. Here, we investigate the geometry of the...
InSAR time series of surface deformation from 16 yr of Envisat (2003-2011) and Sentinel-1 (2014-2019) ESA satellite radar measurements have been constructed to characterise spatial and temporal dynamics of ground deformation over an 80,000 km² area in the permafrost of the northeastern Tibetan Plateau. The regional deformation maps encompass variou...
Separating different sources of signal in Interferometric Synthetic Aperture Radar (InSAR) studies over large areas is challenging, especially between the long‐wavelength changes of atmospheric conditions and tectonic deformations, both correlated to elevation. In this study, we focus on the 2017‐2018 Slow Slip Event (SSE) in the Guerrero state (Me...
Slope deformation in mountainous terrain can be driven by different processes, the nature of which is either gravitational and irreversible or seasonal and reversible, the latter induced by permafrost variations or by hydromechanical or thermomechanical effects. The importance of identifying such deformations is not only related to the hazard they...
Understanding the mechanisms by which earthquake cycles produce folding and accommodate shortening is essential to quantify the seismic potential of active faults, and integrate aseismic slip within our understanding of the physical mechanisms of the long-term deformation. However, measuring such small deformation signals in mountainous areas is ch...
An 8-year archive of ENVISAT SAR data over a 300x500km2-wide area in northwestern Tibet is analyzed to construct a line-of-sight (LOS) map of the current surface velocity field. The resulting velocity map reveals (1) a velocity gradient across the Altyn Tagh Fault, (2) a sharp velocity change along a structure following the base of the alluvial fan...
This document provides additional text and figures explaining and illustrating all the processing steps of the SAR data.
Maps of the seasonal deformation, the time lag, and the multi-annual subsidence or uplift rates in Google Earth format.
Multitemporal interferometric synthetic aperture radar (InSAR) observations are used to characterize spatial variations of the permafrost active layer and its temporal evolution in Northwestern Tibet. We develop a method to enhance InSAR performances for such diicult terrain conditions and construct an 8 year timeline of the surface deformation ove...
Je me focalise sur trois grands systèmes de failles transformantes obliques au Tibet et en Californie du Sud, et ce, afin de mieux comprendre et quantifier les relations entre les différentes structures qui les définissent. L'interférométrie radar à Synthèse d'Ouverture (InSAR) dispose du potentiel pour cartographier et localiser précisément la déf...
Supporting Information S1
Due to the limited resolution at depth of geodetic and other geophysical data, the geometry and the loading rate of the ramp-décollement faults below the metropolitan Los Angeles are poorly understood. Here we complement these data by assuming conservation of motion across the Big Bend of the San Andreas Fault. Using a Bayesian approach, we constra...
We use Multi-Temporal Interferometric Synthetic Aperture Radar (MT-InSAR) to study hydrological and intra-continental deformation in northwestern Tibet, between longitudes 82.5 • E and 87 •. We process the complete En-visat archive data along three 800 km-long tracks extending from the Tarim basin to the central part of the Tibetan plateau. Interfe...
Oblique convergence across Tibet leads to slip partitioning with the coexistence of strike-slip, normal and thrust motion on major fault systems. A key point is to understand and model how faults interact and accumulate strain at depth. Here, we extract ground deformation across the Haiyuan Fault restraining bend, at the northeastern boundary of th...
Additional GPS referencing, InSAR processing and modeling methods.
Describe and model the distribution and kinematics of solifluction processes on the Tibetan plateau from radar interferometry (InSAR) measurements
Understanding how successive earthquakes accrue on faults to produce tectonic landforms. The Apennines range, host of the 2016 seismic sequence (5 shocks Mw5-6.5 over 9 months), is a unique area where the accumulation and release of slip over multiple seismic cycles, over time scales of 1yr-1 Myr and spatial scales of 1m-100km, can be determined. We will combine frontier methodologies in geochronology, remote sensing, geodesy, geophysics, high-resolution topographical data acquisition, seismic hazard modelling, all developed and/or mastered by our teams, to quantitatively constrain how portions of the seismic cycle scale up over multiple cycles to produce the cumulative escarpments we see in the landscape. This research - project acronym EQTIME - is funded by the ANR (Agence Nationale de la Recherche) from 2020 to 2024.
The goal of this project is to bring additional constraints from structural geology into earthquake cycle modelling in order to complement our limited observations from geodetic data, better understand how faults interact and accumulate slip at depth, and produce self-consistent kinematic models that take into account the structural complexity of a fault-system.