I am interested in the deformations of over-riding plates due to subduction and collision processes, at different time scales.
My work aims at characterizing the deformation as well as identifying the structures that drive the deformation, and quantifying their kinematics in order to better understand the origin, time- and space-scales of the phenomenons. So far, i have worked in two geodynamic context: the oblique subduction of the Lesser Antilles arc (Eastern Caribbean) and the nascent arc-continent collision of the Sunda arc, Indonesia. In both areas, my work has direct implication on seismic and tsunami hazard assessment.
In the Caribbean, I identified vertical movements undergone by the over-riding plate thanks to morphologic and stratigraphic studies of Quaternary reef terraces, on the basis of geophysical data (bathymetry, seismic reflection profiles, etc) and modeling.
Jointly, I also tried to determine the kinematics of a 800 km long fault system that crosscut the Lesser Antilles arc, and that is certainly the result of slip-partitioning occurring along this oblique convergent plate boundary. Based on geophysical data analysis, I study the fault system at different scales and try to constrain its kinematics and seismic hazard.
My work also falls in the field of paleo-seismology as i took part to cores analysis that were presenting turbidites triggered by earthquakes. I also joined the ODEMAR-Saintes pioneer cruise during which we directly observed the fault scarps and coseismic deformation of the 2004 Les Saintes earthquake and mapped the rupture extent underwater (Escartin, Leclerc et al., submitted to EPSL). I will join the CASEIS expedition this year that aims at building a catalog of past earthquakes in the Lesser Antilles arc by identifying earthquake triggered turbidites in forearc basins. Next year, i will also join the SUBSAINTES cruise that we proposed last year, whose goal is to systematically acquire high-resolution bathymetric and photomosaic data over Les Saintes fault system in order to fully characterize the surface expression of the 2004 Les Saintes earthquake rupture, and investigate the rupture history of the faults and effusive history of submarine volcanoes.
In SE Indonesia, i study the morphology and stratigraphy of uplifted quaternary fossil reef terraces in order to draw the pattern of deformation of this area which constitutes a nascent arc-continent collision. The goal of this project is to better understand how the convergence is accommodated in this area, and what is the kinematic of the deformation. This multi-disciplinary project involves tectonic, geomorphology, sedimentology and geochronology studies.
I took part in 7 scientific oceanic cruises. It allows me to be familiar with geophysical equipements (Echosounder, Seismic reflection facility, side-scan sonar, gravitymeter, ROV, AUV...) and how to process the data, as well as the way to manage the cruises. On my last cruise (MEGATERA), we have been looking for the fault system that generated the biggest intraplate earthquakes on Earth ever recorded (Mw8.6 & 8.2, 2012 Wharton Basin events) and we acquired data over the Mentawai Gap, a part of the Sunda megathrust that did not rupture yet.
I also worked several times in Volcanological and Seismological Observatories in the Lesser Antilles (Mount Pelée observatory) and Hawai’i, in the Seismology groups. I am thus familiar and interested by seismology, location and relocations of earthquakes, etc…