According to the standard procedure approved in 2014 by the FDSN, GEOSCOPE data are referenced with the Digital Object Identifier (DOI) of the network.

The GEOSCOPE DOI is doi:10.18715/GEOSCOPE.G

If you are using GEOSCOPE data for your research, this DOI has to be mentioned in the "Acknowledgments" or in a specific section ("Data resources", or similar) where data origin is requested. Rather than the DOI alone, we encourage the use of the full citation :

Institut de physique du globe de Paris (IPGP) and Ecole et Observatoire des Sciences de la Terre de Strasbourg (EOST). (1982). GEOSCOPE, French Global Network of broad band seismic stations. Institut de physique du globe de Paris (IPGP), Université de Paris. https://doi.org/10.18715/GEOSCOPE.G

According to FDSN guidelines, we also strongly encourage to cite the GEOSCOPE network in the main body of your paper (in particular when the study uses a small number of seismic networks). This is done as for a classic article citation :

In the main body of the article, for example :

In this study we used data from the GEOSCOPE network (Institut de physique du globe de Paris (IPGP) and Ecole et Observatoire des Sciences de la Terre de Strasbourg (EOST), 1982).

In the Reference list :

Institut de physique du globe de Paris (IPGP) and Ecole et Observatoire des Sciences de la Terre de Strasbourg (EOST). (1982). GEOSCOPE, French global network of broad band seismic stations. Institut de physique du globe de Paris (IPGP), Université de Paris. https://doi.org/10.18715/GEOSCOPE.G

The reference above can also be automatically generated using the FDSN web tool.