16 years of earthquakes between Hengill and Hekla Volcanoes in South Iceland ,,, shown on Google earth, shown as cumulative intensity plot and shown with longitudinal elevation profile. Major source links: Lurking Data Plots= http://www.jonfr.com/volcano/?p=1329&cpage=1#comment-16405 and http://www.jonfr.com/volcano/?p=1329&cpage=1#comment-16531