Hello Alessandra - AVO has GPS networks on a handful of volcanoes. I've cc'd Jeff Freymueller on this email, who can tell you more about the data and where/when it is available. Thank you, Cheryl Cameron -------- Alessandra Mascitelli wrote: Good morning, I am an italian PhD student (geodesy and geomatics division) and my research is about troposphere analisys by gps receivers. I was wondering if you have a gps network near volcanoes and if it was possible to tell directly with someone who cure this kind of data and could be interested in a data exchange. Thank you very much in advance Best regards Alessandra Mascitelli -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050