RESEARCH FIELDEnvironmental science › Earth science
RESEARCHER PROFILEFirst Stage Researcher (R1)
APPLICATION DEADLINE26/02/2021 23:00 - Europe/Brussels
LOCATIONFrance › Paris
TYPE OF CONTRACTTemporary
HOURS PER WEEK35
OFFER STARTING DATE01/09/2021
EU RESEARCH FRAMEWORK PROGRAMMEH2020 / Marie Skłodowska-Curie Actions COFUND
MARIE CURIE GRANT AGREEMENT NUMBER945304
“Artificial intelligence for the Sciences” (AI4theSciences) is an innovative, interdisciplinary and intersectoral PhD programme, led by Université Paris Sciences et Lettres (PSL) and co-funded by the European Commission. Supported by the European innovation and research programme Horizon 2020-Marie Sklodowska-Curie Actions, AI4theSciences is uniquely shaped to train a new generation of researchers at the highest academic level in their main discipline (Physics, Engineering, Biology, Human and Social Sciences) and master the latest technologies in Artificial Intelligence and Machine Learning which apply in their own field.
26 doctoral students will join the PSL university's doctoral schools in 2 academic cohorts to carry out work on subjects suggested and defined by PSL's scientific community. The 2020 call will offer up to 15 PhD positions on 24 PhD research projects. The candidates will be recruited through HR processes of high standard, based on transparency, equal opportunities and excellence.
Description of the PhD subject: “Artificial Intelligence for Seismic Hazard Monitoring with InSAR”
Context - Motivation
Earthquakes are some of the most dangerous hazard on Earth while also being the least understood and predictable. Active faults accommodate the relative motion of tectonic plates that pave the surface of our planet. As these plates are elastic to first order and in constant, steady-state, motion, relative displacement at plate boundaries leads to stress increase within the first kilometers of the crust. Such stress is released by slip on faults between plates, either gently and slowly over days to months to years by a seismic slip or rapidly, within seconds, by a rupture generating devastating seismic waves. These earthquakes may suddenly rupture fault sections over hundreds of kilometers with meters of relative displacements, resulting in strong ground motion with destructive potential.
Over the last 2 decades, the expansion of space geodetic measurement techniques led to the discovery of an entire spectrum of modes of fault slip. Faults can be either locked most of the time or slipping slowly over decades. Faults can also slip aseismically for weeks to months during what is now recognized as Slow Slip Events (SSEs). First, recent observations suggest these slow slip events exist at all spatial and temporal scales and bear striking resemblance with classic earthquakes only slower. These slow slip events release a significant fraction of the stress, hence affect budgets of potential earthquakes along faults, interact with earthquakes via triggering and arrest mechanisms and influence the nucleation, the propagation and the termination of earthquakes, hence their magnitudes. From a fundamental point of view, understanding these events would lead to a better understanding of earthquakes and faulting. Second, numerical models of dynamic faulting predict earthquakes start with a nucleation phase that may span several minutes to days. Recent but few seismological and geodetic observations suggest a precursory phase to earthquakes may last from days to months with characteristic behavior such as foreshock migrations and slow slip events. Very few of these observations are available and it is currently impossible to determine in advance whether a slow slip event captured by geodetic data is the precursory phase to a large devastating earthquake or a harmless slow transient. Being able to mine within geodetic data to document all forms of slow slip events, whether they lead to an earthquake or not, would open the door to a quantification of the dynamics, hence potentially the understanding, of these transient deformation phase precursory to large earthquakes.
6 years ago, the European Space Agency triggered the golden age of Synthetic Aperture Radar observation of the Earth, with the launch of the Sentinel 1 constellation associated with a fully open policy on data distribution. Nowadays these satellites image every plate boundary region with a repeat frequency of a few days, allowing us to build time series of ground deformation with a millimeter precision with unprecedented spatial resolution (InSAR; ~100 m pixel size over hundreds of km). In the years to come, several space agencies, including NASA, the Canadian space agency and the JAXA will launch several satellites with comparable operating modes and open-data policies, perpetuating our ability to monitor ground deformation globally in time. We have built tools in our team to ingest, process and analyze these movies of ground deformation within the scope of the Geo4D ERC StG project and are in a position to monitor any plate boundary in continental region with great accuracy. However, despite efforts from the entire community of the last 20 years, these measurements are still polluted with atmospheric artifacts of amplitude comparable to the signals of deformation we arelooking for, requiring visual inspection by trained experts of the time series in order to assess the source of the signals, tectonics or artifacts. We are currently missing a tool that will clean our series of data and detect any transient slow slip event in InSAR time series, globally. Such tool would allow to build a collection of all slow slip events globally with the ambition to identify key differences between harmless slow slip events and the precursory phase to devastating earthquakes. In addition,such data set would allow to experiment existing mechanical models toward a complete understanding of the dynamics of fault slip.
Scientific Objectives, Methodology & Expected results
We have developed a prototype neural network designed for the removal of atmospheric artifacts within time series of data to highlight slow slip events. Our neural network, purely convolutional, trains onsynthetic time series of noise and surface displacements to separate the tectonic signal from the noise. Since we do not have ground truth in this enterprise, except in a few identified regions of the world, we have to use a synthetic, theoretical, training set. Our neural network is able to detect and highlight events that have been previously identified by experts and reveals the intriguing dynamics of slow slip along transform plate boundarieson newly processed datasets.
However, several issues remain and intense development and testing is required in order to push forward our approach.
- Significant improvements are required in the core of our algorithm. We are currently facing scaling issues that prevent us from detecting other forms of ground deformation than fault slip that reaches the surface. Solving this identified issue will allow to detect large scale tectonic deformation signals related to slip at depth (which is not currently possible with our method) and the inflation/deflation sources such as volcanic or hydrological ones. We should be in a position, at the end of the PhD thesis, to extract, in addition to tectonic signals, the deformation signature of volcanoes or crustal reservoirs for hydrology.
- We need to improve noise modeling for the training phase and various noise structures should be explored. We will base this part of the project on a collaboration with the Willow team (INRIA/ENS - PSL, PI Prof.J. Ponce), which develops a range of learning-based methods for image restoration tasks such as deblurring, denoising, and super-resolution.
- We will compare our results with the detections from a network of GNSS sites measuring ground deformation at discrete points on the ground along the North Anatolian Fault, in Turkey. This main plate boundary fault, threatening the mega-city of Istanbul, slips aseismically episodically along its central portion and we have installed a network of GNSS sites that measures ground deformation continuously. Ideally, the predictions of our neural network should match our detections from GNSS data.
- A global and continuous hunt for slow slip events within the entire Sentinel 1 archive over actively deforming regions will be conducted toward the understanding of the dynamics of fault slip and, potentially, the identification of key observations precursory to large earthquakes.
The project should be feasible in 3 years. The first methodological developments, including the detection of large scale signals (slip at depth and deflation sources) and noise structure examination should be done over the first year of the PhD. Validation of the method, which includes learning some concepts about GNSS data processing and analysis, should be done over the next 6 months. The large scale implementation, detection and subsequent modeling of slow slip events globally should then take one year, leaving 6 months for the preparation of the final manuscript and for finalizing the last publications.
In terms of skills, the PhD candidate will be fluent in InSAR processing, interpretation of ground deformation data (including tectonics, volcanic or hydrological sources), some concepts about GNSS data processing (done in the lab by our engineers) and of course, all things related to the development of the algorithms. The candidate will benefit from a stimulating environment in a lab where experimental rock mechanics experts collaborate with experts in theoretical solid mechanics, experts in geodesy, tectonics and seismology with regularvisiting researchers from all around France, Europe and the world.
This project is based on 2 international collaborations which will directly benefit the PhD candidate, including the collaboration with the Los Alamos National Lab, NM, USA and with the Istanbul Technological University and Kandili Observatory colleagues, Pr. Z. Çakir and Dr. S. Ergintav, who are key in the setup and maintenance of the GNSS network we intend to use for the validation of our results.
This PhD thesis will benefit from our starting collaboration with the Inria team Willow in Paris (PI. Pr. J. Ponce, INRIA/ENS - PSL). We plan to attend at least 2 international conferences (American Geophysical Union and European Geosciences Union) and multiple workshops.
Romain Jolivet and Bertrand Rouet-Leduc
Created in 2012, Université PSL is aiming at developing interdisciplinary training programmes and science projects of excellence within its members. Its 140 laboratories and 2,900 researchers carry out high-level disciplinary research, both fundamental and applied, fostering a strong interdisciplinary approach. The scope of Université PSL covers all areas of knowledge and creation (Sciences, Humanities and Social Science, Engineering, the Arts). Its eleven component schools gather 17,000 students and have won more than 200 ERC. PSL has been ranked 36th in the 2020 Shanghai ranking (ARWU).
- Opportunity to conduct academic research in a top 100 university in the world.
- High-quality doctoral training rewarded by a PhD degree, prepared within Ecole Normale Supérieure - PSL and delivered by PSL.
- Access to cutting-edge infrastructures for research & innovation.
- Appointment for a period of 36 months (job contract delivered by the involved component school of PSL) based on a salary of 3100 € gross employer (including employer tax) per month or approximately a 2228 € gross salary per month.
- Job contract under the French labour legislation in force, respecting health and safety, and social security: 35 hours per week contract, 25 days of annual leave per year (“congés annuels”). Eventual complementary activities may be accepted or proposed by the co-supervisors (maximum of 64h/year for teaching, 32 day/year for specific missions).
- Short stay(s) or secondment in France or abroad are expected.
- An international environment supported by the adherence to the European Charter & Code.
- Access to AI training package, with a strong interdisciplinary focus, together with a Career development Plan.
- Applicants must have a Master’s degree (or be in the process of obtaining one) or have a University degree equivalent to a European Master’s (5-year duration) to be eligible at the time of the deadline of the relative call.
- There is no nationality or age criteria, but applicants must not have resided or carried out their main activity (work, studies, etc.) in France for more than 12 months in the 3 years immediately before the deadline of the call (MSCA Mobility rule).
- Applicants must declare to be available to start the programme on schedule.
For submitting your online application, go to: https://www.psl.eu/recherche/grands-projets-de-recherche/projets-europee...
The online application should contain the following documents:
- English translated transcripts from the Master’s degree (or equivalent 5-year degree). A copy of the Master’s degree or a certificate of achievement will be required later on for the final registration.
- International curriculum vitae and a cover letter explaining the reasons that lead him/her to prepare a PhD, why he/she applies to this offer and his/her professional project (guidelines will be given to the applicants in order to help him/her in the writing of his/her letter).
- Two academic reference letters.
- A statement duly signed on the mobility rules, availability, and conflicts of interest.
The applicants can only apply to one PhD project among the available ones. Multiple applications of one candidate will automatically make all his/her applications ineligible.
The applications will be analysed by the Management Team for eligibility and completeness. Afterwards, the applications will be reviewed by the Selection Committee. In the pre-selection round (March-April 2021), applicants will be rated using a scoring system based on 3 criteria (academic excellence, experience, motivation, and qualities). A shortlist of qualified applicants will be interviewed during the selection round (June 2021) to further assess their qualifications and skills according to the predefined selection criteria.
All information regarding the applications (criteria, composition of the Selection Committee, requirements) can be found on the website of the programme, in greater detail.
The selection and recruitment processes of the PhD student will be in accordance with the European Charter for Researchers and Code of Conduct of the Recruitment of Researchers. The recruitment process will be open, transparent, impartial, equitable, and merit based. There will be no discrimination based on race, gender, sexual orientation, religion of belief, disability, or age.
The Laboratoire de Géologie is hosted by the École Normale Supérieure - PSL, within its Département de Géosciences. The lab is made of three teams focusing on Basins & Reservoir, Geodynamics and, for the present application, Faults & Earthquakes. Our department hosts researchers working on various topics from climate science to the dynamics of the inner Earth and is the main support for the Master Geosciences of the Université PSL. Our team, Faults & Earthquakes, focuses on the mechanics of active faults for the understanding of the nucleation of earthquakes and tectonics and for the quantification of seismic hazard in general. We combine expertise in experimental rock mechanics (Dr. A. Schubnel, ERC Realism), numerical modeling of the rupture (Dr. H. S. Bhat, ERC Persismo) with a strong observational component based on international networks of ground deformation monitoring (GNSS and tilt-meter in the Corinth Rift Lab, in Chile and in Turkey) and an expertise in satellite image processing and interpretation (PI R. Jolivet, ERC Geo4D). The team includes ~15 permanent researchers and professors, ~10 PhD students and postdocs and 3 research engineers.
The Ecole Normale Supérieure - PSL is a leading multidisciplinary institution that focuses on training through research. The ENS - PSL defines and applies scientific and technological research policies, from a multidisciplinary and international perspective and counts close relationships with prestigious partners, in France and abroad. It encompasses fourteen teaching and research departments, spanning the main humanities, sciences, and disciplines. The ENS - PSL currently has a staff of almost 800 lecturers, ENS - PSL, CNRS or associated researchers, and post-doc researchers. Within its Departments, the ENS - PSL includes 40 research units identified as ENS - PSL, INSERM or INRIA, encompassing ENS - PSL and CNRS agents as well as 300 foreign researchers and 650 doctoral students. The ENS - PSL respects the principles of the European Charter and Code for Researchers and is engaged in the HRS4R certification.
Web site for additional job details
Required Research Experiences
YEARS OF RESEARCH EXPERIENCE1 - 4
REQUIRED EDUCATION LEVELPhysics: Master Degree or equivalent
REQUIRED LANGUAGESENGLISH: Excellent
- We expect candidates to be trained in linear algebra and/or the level of Master in Physics or Geophysics.
- Basic knowledge in Earth sciences would be an asset but we will not consider only Geophysics majors (Physics, Computer Sciences and Mathematics majors are strongly encouraged to apply).
- Candidates must be proficient in at least one general-purpose programming language, preferably Python.
- Some concepts of solid mechanics and/or rock mechanics will be considered but optional.
- Experience in Deep Learning and Machine Learning will be considered but optional.
EURAXESS offer ID: 579946
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