ESR1: NIGGG – INGV (Bulgaria – Italy)
ESR2: NOA – NIGGG (Greece – Bulgaria)
ESR3: HUA – CNRS (Greece – France)
ESR4: NKUA – CNRS (Greece – France)
ESR5: CNRS – UNINA (France – Italy)
ESR6: INGV – CNRS (Italy – France)
ESR7: CNRS – NOA (France – Greece)
ESR8: CUP – CNRS (Czech Republic – France)
ESR9: INGV – HUA (Italy – Greece)
ESR10: UNINA – CNRS (Italy – France)
ESR11: CNRS – NOA (France – Greece)
ESR12: CNRS – UPAT (France – Greece)
ESR13: UPAT – CUP (Greece – Czech Republic)
ESR14: CNRS – NKUA (France – Greece)
ESR15: NOA – INGV (Greece – Italy)