Supervisor name: Scambelluri (UG)marco.scambelluri@dipteris.unige.it// Advisory Panel: Tonarini (s.tonarini@igg.cnr.it)/Mezger(klaus.mezger@geo.unibe.ch)/Angiboust samuel.angiboust@upmc.fr/Garcia-Cascoagcasco@ugr.es(UG/UB/GFZ/CSIC)PhD enrolment: Y

• investigate natural examples of the plate interface (i.e. high to ultrahigh-pressure rock units from the Alps and Tianshan)
  • determine petrological/mineralogical/geochemical characteristics of rocks and of fluid-related structures.
  • By means of high-resolution bulk-rock and in-situ mineral analysis of major, trace elements, stable (O, H, Li, B) and radiogenic (Sr, Pb) isotopes coupled with newly designed geochemical tracers (e.g. As, Sb),
  • define the fluid channelways,
  • determine the chemical exchange associated with slab fluid infiltration,
  • trace the origin and physical pathways of rocks and fluids along the plate interface.

Methods: field mapping; petrological/geochemical characterization of rocks/minerals by electron microscopy, electron microprobe, ICP-MS laser ablation and TIMS (thermal ionization mass spectrometry) analyses; geochemical modelling of fluid/rock exchange, element partitioning and stable isotope fractionation

Supervisor name: Oncken (GFZ)oncken@gfz-potsdam.de Advisory Panel: Angiboust samuel.angiboust@upmc.fr/Agard (philippe.agard@upmc.fr )/Burov (evgenii.burov@upmc.fr )/AGILENT (GFZ/UPMC/UPMC/AGILENT)PhD enrolment: Y

• image the deformation patterns at the plate interface,
• characterize its relationship to rheological parameters (using high-resolution geodetic and seismological data from the IPOC observatory and Maule 2010 Mw 8.2 earthquake, in northern/central Chile, respectively)
• combine these observations with field-based studies in the Alps and Chile;
• constrain fluid-assisted processes in rocks via upscaling and kinematic modelling of processes driving the various deformation events along the plate-boundary.

Methods: seismic tomography, field mapping, models of fault slip, pore elastic deformation, viscous response and thermo-mechanical processes

Supervisor name: Vigny (CNRS)vigny@geologie.ens.fr// Advisory Panel: Schubnelaschubnel@geologie.ens.fr/Morenomarcos.moreno@gfz-potsdam.de/Rolandone (frederique.rolandone@upmc.fr)/Ranero cranero@cmima.csic.es(CNRS/GFZ/UPMC/CSIC)PhD enrolment: Y

• quantify the coupling along the length of the upper part of the subduction interface, using upper plate deformation data from dense/frequent high-quality space-geodesy observations (GPS, InSAR) to understand the origin of asperities, of barriers between seismic segments,
• characterize the new seismic hazard generated by megathrust earthquakes.

Methods: integration from high-end, dense monitoring networks (LIA and IPOC observatories, Chile) across a fully continental upper plate with continuous GPS stations (~100), seismological stations (broad band, accelerometers), tilt meters, geodetic benchmarks (>300).

Supervisor name: Meier (CAU)meier@geophysik.uni-kiel.de// Advisory Panel:Rabbel (wrabbel@geophysik.uni-kiel.de)/REPSOL /Bosch (lapo.boschi@upmc.fr /Scambelluri (marco.scambelluri@dipteris.unige.it)(CAU/REPSOL/ UPMC/UG)PhD enrolment: Y

• use the microseismicity of the Hellenic forearc to decrease location uncertainties to a few hundred meters, which will allow to locate both active faults and the subduction interface,
• constrain processes such as ongoing fluid release at intermediate-depths.
• Insights into triggering processes will be provided by means of cluster analysis
• Comparison with ESR 3 and 5 (local earthquake tomography and receiver functions). Tight links with ESR 11

Methods: seismology, data processing of clusters of highly similar microseismic events.

Supervisor name: Ranero (CSIC)cranero@cmima.csic.es // Advisory Panel: Sallares (vsallares@cmima.csic.es)/REPSOL /Chamot-Rooke (nico.rooke@gmail.com)/Sachpazi   m.sachp@noa.gr(CSIC/REPSOL/CNRS/NOA)PhD enrolment: Y

• combine multichannel and wide-angle seismics (collected where historical >Mw8 have occurred) with other complementary geophysical data (e.g. gravity)
• provide information on the geometry and the physical-seismological nature of the inter-plate boundary of the seismogenic zone, which jointly influence the degree of plate coupling across these regions, the occurrence of mega-thrust earthquakes and the deformation pattern of the overriding plate

Methods: processing and numerical modelling of marine seismic data, combined seismic and gravity modeling.

Supervisor name: Garrido (CSIC)carlos.garrido@csic.es// Advisory Panel: Lopez-S. Vizcainovlopez@ujaen.es /Connollyconnolly@erdw.ethz.ch  /Dubacq (benoit.dubacq@upmc.fr /Gerya taras.gerya@erdw.ethz.ch(CSIC/ ETH/UPMC/ETH)PhD enrolment: Y

• Quantify the role of non-lithostatic fluid pressure in controlling dehydration reactions at depth and implement modifications in current thermodynamics numerical codes for simple dehydration reactions, with a focus on serpentinite dehydration
• Study of natural analogs. Implement them in simple 1D thermo-mechanical models to investigate their effects on metamorphic equilibrium and kinetics. Melts will also be considered. Strong links with projects of ESR 7 and ER1

Methods: field mapping, petrology, geochemistry, thermodynamic modelling

Supervisor name: Pettke (UB) pettke@geo.unibe.ch// Advisory Panel: Mezgerklaus.mezger@geo.unibe.ch /THERMOFISHER /Handy mark.handy@fu-berlin.de /Ramponebetta@dipteris.unige.it(UB/THERMOFISHER/FUB/UG)PhD enrolment: Y

• quantify the chemical and isotopic signature of fluid components lost from the slab during subduction at progressively deeper levels of dehydration, using natural rock samples from fossil subduction zones;
• constrain migration pathways in and along the slab and across to the deep mantle, as well as dehydration/fluid production rates and the magnitude of non-lithostatic stresses and related seismicity. Collaboration with ESRs 1, 4, 8 and ER1.

Methods: link careful petrography with bulk rock and in-situ geochemistry (XRF, ICP-MS, TIMS, LA-ICP-MS, SIMS) of trace elements and isotopes, fluid characterization.

Supervisor name: John (FUB)timm.john@uni-muenster.de// Advisory Panel: Handy mark.handy@fu-berlin.de /Agard philippe.agard@upmc.fr/Tonarini s.tonarini@igg.cnr.it/Engi (engi@geo.unibe.ch)(FUB/ UPMC//UG/UB)PhD enrolment: Y

• constrain the time evolution of deformation patterns associated with fluid pathways along exhumed portions of the subduction interface, in carefully selected field areas (Alps and TIanshan);
• constrain their absolute timing via recrystallized accessory minerals and model the duration of the different fluid pathways through high-end chronometry (ie., Li-diffusion). Links to projects of ESRs 1, 2 and ER1.

Methods: tectonics, field mapping, metamorphic petrology, fluids, chemical gradients, diffusion modelling, geochronology.

Supervisor name: Schubnel (CNRS)aschubnel@geologie.ens.fr// Advisory Panel: Guillot Stephane.Guillot@ujf-grenoble.fr/John timm.john@uni-muenster.de/Onckenoncken@gfz-potsdam.de/KarastathisKarastathis@noa.gr(CNRS/ FUB/GFZ/NOA)PhD enrolment: Y

• explore experimentally the impact of dehydration reactions on effective bulk rheology for various protolith lithologies (ie, mafic crust or its sedimentary cover; breakdown of amphibole/chlorite/serpentine) through the measurement of the effective viscosity of representative,synthetic and natural aggregates at HP conditions.
• Test numerically the results at both experimental and natural strain rates in view of their integration in subduction-scale geodynamic models, thereby bridging the gap between those two extreme scales.

Methods: experimental rheology, fluid-rock experiments, modelling. Linked to ESRs 2, 3 and 10 and to ER2.

Supervisor name: Verlaguet (UPMC)anne.verlaguet@upmc.fr// Advisory Panel: Labrousseloic.labrousse@upmc.fr/ Federicofederico@dipteris.unige.it/Morenomarcos.moreno@gfz-potsdam.de/Pettke (pettke@geo.unibe.ch )(UPMC/ UG/GFZ/UB)PhD enrolment: Y

• Study selected examples of paleoseismicity (ie. pseudotachylites, eclogite breccias) in the field, along, at the vicinity or within isolated fragments returned along the fossil plate interface in the Alps and Tianshan, in order to constrain their spatial extent, recurrence, and the chief controlling parameters.
• In the laboratory, innovative rock deformation experiments at HP-HT and various strain rates with reaction progress monitoring (through regular fluid sampling) will be designed to test the hypotheses derived from field observations (ie fluid/melt production, external fluid influx), in close interaction with projects ESRs 2 and 9.

Methods: field mapping, tectonics, petrology, rheology

Supervisor name: Papadopoulos (NOA)papadop@noa.gr// Advisory Panel: Papanastasiou  (d.papan@noa.gr )/Weidle (cweidle@geophysik.uni-kiel.de )/Schurr  (schurr@gfz-potsdam.de )/Vigny (vigny@geologie.ens.fr)(NOA/ (CAU/GFZ/CNRS)PhD enrolment: Y

• combine seismological observations (e.g. extent of the rupture area; updip and downdip limit of the seismogenic zone in historical, tsunamigenic portions of the Hellenic subduction interface) with models of seismic,
• stick–slip frictional instabilities around the inter-plate boundary and of the inter-plate geometry to better understand the inter-relationships between seismic rupture, elastic properties of the subducting and overriding plates and megaearthquake generation, in close coordination with projects of ESRs 4, 5 and 12.

Methods: modelling of seismic instabilities.

Supervisor name: Gerya (ETH)taras.gerya@erdw.ethz.ch// Advisory Panel: Dalguer (dalguer@tomo.ig.erdw.ethz.ch)/LePourhiet (laetitia.le_pourhiet@upmc.fr)//Fleitout (fleitout@geologie.ens.fr)   /Schurr (schurr@gfz-potsdam.de )(ETH/ UPMC/CAU/GFZ)PhD enrolment: Y

• model long-term seismic cycles by coupling geodynamic numerical modelling codes with seismic rupture models in a self-consistent manner (ie with spontaneously forming fluid-absent/present visco-elasto-brittle/plastic fault zones enabling to test the seismic consequences of slow tectonic loading in a complex subduction interface geometry);
• model interseismic-coseismic-postseismic deformation for both normal and silent earthquakes and test predictions from numerical models with seismic observations (projects 1.3-4-5) and paleoseismic rock records (3.2). Other links: ER1 and ESR 11.

Methods: numerical modelling, rheology, seismology.