Unfortunately as funding becomes tighter it is becoming more difficult to find summer time employment doing volcanology. Paid positions are pretty much non-existant, but there is hope if you can work as a volunteer. My advice would be to talk to people at universities doing volcanological research that interests you and see if you can help on field projects. Also, the Hawaiian Volcano Observatory has had a program for summer volunteers for many years. Details can be found on their web-site. Occasionally there are opportunities to work at other volcano observatories too, but these are sporadic and will require a bit of luck and good timing on your part. Regardless, summer jobs are the best way to learn the basics of volcanology and I highly encourage anyone interested in this aspect of geology to pursue any opportunity they can find.

Studying Volcanoes / Volcanology