EPSRC DTP - Mechanical failure mechanisms at high pressure

About the project

About the Project The occurrence of earthquakes with hypocenters deeper than 60 km was recognised very early in the history of seismology. These deep earthquakes make up∼25 % of all earthquakes, are exclusively associated with convergent plate boundaries and locate within, or very close to, thcold subducting oceanic lithosphere. Their occurrence presents theoretical difficulties since brittle failure, the dominant mechanism in shallow earthquakes, should be suppressed as confining pressure increases with depth. Transformational faulting, thermal run-away and dehydrational embrittlement have all been proposed as alternative causal mechanisms and show some efficacy to explain the mechanisms. However, experiments have been upable to reproduce the depth districution of deep earthquakes. Globally, between 60 and∼300 km, the number of earthquakes decreases in an approximately exponentially manner. These earthquakes are localised within the subducting lithosphere into two distinct layers, called Wadati–Benioff zones. Between 300 and∼500 km, the earthquakes form a single plane of events that is located towards the top of the subducting lithospheric slab and their number plateaus before increasing to a maximum around 575 km. Earthquake numbers decrease rapidly below 635 km, with the deepest recorded earthquake observed at∼690 km. In this project we will combine non-destructive testing techniques with a new high pressure experimental apparatus to listen for ‘labquakes’ during high pressure experiments. Experments will be performed to test the proposed causal mechanisms in Earthquakes against ambient pressure observations in industrial composites. Experimental methods will include the use of high pressure multi-anvil techniques, possibly combined with synchrotron X-ray techniques as well as scanning electron microscopy (SEM). The ultimate directions of the project will be driven by the interests of the student, under the guidance of the supervisory team. We are looking for a strongly motivated student with a background in Earth Sciences, Materials Science, chemistry, physics or a related physical science discipline to join our research group. Some knowledge or previous experience in petrology, materials processing, coding or data manipulation would be beneficial but not necessary, since you will receive training in all the relevant experimental and analytical methods. You will be encouraged to attend national and international conferences to share your research. Entry requirement The standard academic entry requirement for this PhD is an upper second-class (2:1) honours degree in a discipline directly relevant to the PhD (or international equivalent) OR any upper-second class (2:1) honours degree and a Master’s degree at merit in a discipline directly relevant to the PhD (or international equivalent) including Materials Science, Geology, Earth sciences, chemistry or physics. Before you apply We strongly recommend that you contact the supervisor for this project before you apply. Please include details of your current level of study, academic background and any relevant experience and include a paragraph about your motivation to study this PhD project. We recommend that you apply early as the advert may be removed before the deadline. How to apply You will need to submit an online application through our website here: https://uom.link/pgr-apply When you apply, you will be asked to upload the following supporting documents: Final Transcript and certificates of all awarded university level qualifications Interim Transcript of any university level qualifications in progress CV You will be asked to supply contact details for two referees on the application form (please make sure that the contact email you provide is an official university/ work email address as we may need to verify the reference) ·Supporting statement: A one or two page statement outlining your motivation to pursue postgraduate research and why you want to undertake postgraduate research at Manchester, any relevant research or work experience, the key findings of your previous research experience, and techniques and skills you’ve developed. (This is mandatory for all applicants and the application will be put on hold without it. · English Language certificate (if applicable). If you require an English qualification to study in the UK, you can apply now and send this in at a later date. Most home students will not require an English qualification. If you have any queries regarding making an application please contact our admissions team FSE.doctoralacademy.admissions@manchester.ac.uk Equality, diversity and inclusion is fundamental to the success of The University of Manchester, and is at the heart of all of our activities. We know that diversity strengthens our research community, leading to enhanced research creativity, productivity and quality, and societal and economic impact. We actively encourage applicants from diverse career paths and backgrounds and from all sections of the community, regardless of age, disability, ethnicity, gender, gender expression, sexual orientation and transgender status. We also support applications from those returning from a career break or other roles. We consider offering flexible study arrangements (including part-time: 50%, 60% or 80%, depending on the project/funder).

Research areas