http://www.advanced.org
2. Volcanoes.Com
http://www.volcanoes.com
3. Volcano World
http://www.nodak.edu
4. Hawaiian Volcano Observatory
http://www.usgs.gov
5. Global Volcanism Program
http://www.si.edu
6. Cascades Volcano Observatory
http://www.usgs.gov
7. NASA EOS IDS Volcanology Team
http://www.mtu.edu
8. Alaska Volcano Observatory
http://www.alaska.edu
9. Hawaii Scientific Drilling Project
http://www.gfz-potsdam.de