West Java is the Indian Ocean. Unlike most other provinces in Indonesia which have their capitals in coastal areas, the provincial capital, Bandung, is located in the mountainous area in the centre of the province. Banten Province was formerly part of West Java Province but was created a separate province in 2000. West Java, in the densely populated western third of Java, is home to almost 1 out of every 5 Indonesians. West Java and Banten provinces, as a part of the Pacific Ring of Fire, have more mountains and volcanoes than any of the other provinces in Indonesia. The vast volcanic
Ryukyu Trench km/s, 3.5 km/s, and 4.5–5 km/s. In the area of this transect, the wedge reaches a thickness of 9 km at 50 km from the trench. Beneath the wedge are several seismic layers within the oceanic crust. Separate ocean bottom seismography and multi-channel seismic studies provide insight into the structure of the northern end of the Ryukyu trench region. Features of note include a thick (7–12 km) low velocity (4–5 km/s) zone on the landward side of the trench, the existence of subducting paleo-arc crust near the top of the trench in contrast to simple oceanic crust located at the