Indonesia covers 30° along equator from east to west, and the end points happen to be the locations of main convection rolls division lines. Tracing the western division line further south, it leads to the most active volcano of Indonesia, Mount Merapi.
Mount Merapi is located over main division line of lower mantle convection rolls.
This indicates an interplay between the subduction of crust material and the mantle convection activity. The few facts shown on the map, a span of 30° along equator and the location of Merapi, already give us some insight into the geology of Indonesia. By further analyzing the effect of upper convection rolls (with 1.5° interval) much more will be revealed about the real nature of volcanism, geothermal activity and the tectonic framework in general.
I am a geologist, graduated from the University of Iceland, and taught geology for a few years. I have gained some knowledge about Earth's inner structure, so I provide this website as my contribution to answer one of the greatest questions remaining within the realm of geoscience. Experiments show that the mantle should form convection rolls when close to the melting point. I took this literally, and calculated the dimensions and shape of these mantle convection rolls. Then I compare that model with the surface. This makes it possible to provide many interesting examples about geology found on my blog.
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Magic Magma 