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
Architecture of Indonesia in Balinese architecture. However, typical ancient Javanese Hindu-Buddhist architecture has been the source of inspiration and recreated in contemporary architecture. For example, Ganjuran Church in Bantul, Yogyakarta contains a "candi"-like Hindu-style shrine dedicated to Jesus. Although religious architecture has been widespread in Indonesia, the most significant was developed in Java. The island's long tradition of religious syncretism extended to architecture, which fostered uniquely Javanese styles of Hindu, Buddhist, Islamic, and to a lesser extent, Christian architecture. By the fifteenth century, Islam had become the dominant religion in Java and Sumatra, Indonesia's two most populous islands. As with Hinduism and Buddhism