1. Edge Hill University, Ormskirk, Lancashire L39 4QP, UK
2. CGG, Tyn Y Coed, Llanrhos, Llandudno LL30 1SA, UK
3. School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, Tyne & Wear NE1 7RU, UK
4. British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
5. The Lyell Centre, Heriot-Watt University, EH14 4AP, UK
6. Cuadrilla Resources Ltd, Manchester Business Park, 3000 Aviator Way, Wythenshawe, Manchester M22 5TG, UK