Sunda Trench an underwater ridge, and much of the trench is at least partially filled with sediments. Mappings after the 2004 Indian Ocean earthquake of the plate boundary showed resemblance to suspension bridge cables, with peaks and sags, indicative of asperity and locked faults, instead of the traditional wedge shape expected. Some of the earliest exploration of the Trench occurred in the late 1950s when Robert Fisher, Research Geologist at the Scripps Institution of Oceanography, investigated the trench as part of a worldwide scientific field exploration of the world's ocean floor and sub-oceanic crustal-structure. Bomb-sounding, echo-train analysis and manometer were some of
Diamantina, Minas Gerais Diamantina, Minas Gerais Diamantina () is a Brazilian municipality in the state of Minas Gerais. Its estimated population in 2006 was 44,746 in a total area of 3,870 km². "Arraial do Tijuco" (as Diamantina was first called) was built during the colonial era in the early 18th century. As its name suggests, Diamantina was a center of diamond mining in the 18th and 19th centuries. A well-preserved example of Brazilian Baroque architecture, Diamantina is a UNESCO World Heritage Site. Other historical cities in Minas Gerais are Ouro Preto, Mariana, Tiradentes, Congonhas and Sabará. Diamantina is a statistical micro-region that includes