Geology of Indonesia active volcanoes formed Sumatra, Java, Bali, and Nusa Tenggara islands, most of which, particularly Java and Bali, emerged within the last 2–3 million years. The Pacific and Australian plate movements controlled the tectonics of the eastern portion of Indonesia. The tectonics processes in Indonesia formed major structures in Indonesia. The most prominent fault in the west of Indonesia is the Semangko Fault or the Great Sumatran Fault, a dextral strike-slip fault along Sumatra Island (about 1900 km). The formation of this fault zone is related to the subduction zone in the west of Sumatra. Palu-Koro fault is another major structural
National Museum of Indonesia the old wing or Gedung Gajah is under major renovation, while the Gedung C is under construction. The museum has a collection of 61,600 prehistoric and anthropological artifacts, and 5,000 archeological artifacts from all over Indonesia and Asia. The museum collections is among the richest, the most complete, and the best of its kind in Indonesia and one of the finest in Southeast Asia. The museum has comprehensive collections of stone statues of classical Hindu-Buddhist period of ancient Java and Sumatra, a kaleidoscope of highly diverse collection of Indonesian ethnography artifacts, as well as quite extensive collections of Asian ceramics.