Viti Levu  Viti Levu (pronounced ) is the largest island in the Republic of Fiji, the site of the nation's capital, Suva, and home to a large majority of Fiji's population. Fiji lies in a tectonically complex area between the Australian Plate and the Pacific Plate. The Fiji Platform lies in a zone bordered with active extension fault lines around which most of the shallow earthquakes were centered. These fault lines are the Fiji Fracture Zone (FFZ) to the north, the 176° Extension Zone (176°E EZ) to the west, and the Hunter Fracture Zone (HFZ) and Lau Ridge to the east. The oldest rocks on the island consist of the Eocene to Lower Miocene Wainimala Group. The Lower portion of the Group are composed of volcanic flows and volcanoclastics, which grade from basalt to trachyte and rhyolite. Geographically, this group is found south of Nadi, including the peaks of Koromba (3528’) and Natambumgguto (1242’), down to Sigatoka. From Sigatoka, the Group extends almost all the way to Lodoni, and includes the peaks of Tuvutau (3060’) and Tikituru (3071’), while along the southern coast it extends almost to Nausori. The Group is intruded by the Tholo Plutonics consisting of similar age stocks of tonalite, granodiorite, gabbro and diorite. Mio-Pliocene sandstones and marl, grading into epiclastics and andesitic volcanics of the Suva Group are found mainly in the river valleys such as those formed by the Nadi River and Navua River. The Plio-Pleistocene Mba Grouop is found on the northern portion of the island and consists of porphyritic basalt flows and volcanoclastics grading into greywacke. Geographically it includes the peaks of Koroyanitu (3921’), Malua (3294’), Monavatu (3708’), Mount Tomanivi (4341’), and Ndelamendamu (2540’), and extends along the eastern coast almost to Nausori. It also includes the Emperor Mine near Vatukoula. Viti Levu is the largest island in the nation, home to 70% of the population (about 600,000), and is the hub of the entire Fijian archipelago.