Minethere Always made the terraforming of the Volcano. She is a designer of raw-files for landscapes. She has a catalogue of files where one can choose the basic design of a SIM. Here you find some terrains Minethere made for free use: http://minethere.blogspot.de/2013/04/free-terrains-and-oars.html
All can be modified. From time to time Minethere publishes a longer text worth to read at http://minethere.blogspot.de/
Minethere offers a full world she named ‘Ancient Ruins of Al Khaznehek’ for download at https://docs.google.com/file/d/0B6pQoewSc4PmT1ltNXR1dzZyWXc/edit?usp=sharing. You find the story behind ‘Al Khaznehek’ and the terms to use. I tried it out and all is working fine. The terrain texture I got all white on the opensim server I used [version 0.7.1 DEV], but this is easy to change.
Without Minethere Always the ‘Volcano of Art’ would not exist the way it looks. Thank you Minethere Always always.