Bonin Islands Pacific Plate is subducting under the Philippine Sea Plate, which creates an oceanic trench to the east of the islands: the Bonin Trench. The crust of the Ogasawara Islands was formed by volcanic activity when subduction began 45–50 million years ago, and is composed mostly of an andesitic volcanic rock called boninite, which is rich in magnesium oxide, chromium, and silicon dioxide. The Ogasawara Islands may represent the exposed parts of an ophiolite that has not yet been emplaced on oceanic crust. The rocks of the Volcano Islands are much younger; Iwo Jima is a dormant volcano characterized by rapid
Japanese occupation of the Andaman Islands Japanese authorities. Various attempts were made to inform him of the sufferings of the people of the Andamans, and the fact that many local Indian Nationalists were at that time being tortured in the Cellular Jail. Bose does not seem to have been aware of this, and the judgment of some is that he "failed his people". After Bose's departure the Japanese remained in effective control of the Andamans, and the sovereignty of the "Arzi Hukumat-e Hind" was largely fictional. The islands themselves were renamed "Shaheed" and "Swaraj", meaning "martyr" and "self-rule" respectively. Bose appointed General A. D. Loganathan as