Michael Bliss Singer, Cardiff University, School of Earth & Ocean Sciences, Cardiff, United Kingdom, Owen Jones, Cardiff University, School of Mathematics, Cardiff, United Kingdom, Katerina Michaelides, University of Bristol, School of Geographical Sciences, Bristol, BS8, United Kingdom, Roberto Quaglia, University of Bristol, Department of Geographical Sciences, Bristol, United Kingdom and Rafael Rosolem, University of Bristol, Civil Engineering, Bristol, United Kingdom