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
Chapada Diamantina entry of water into the rock’s structure which in turn is responsible for the erosion. Chapada Diamantina Chapada Diamantina (Portuguese for the "Diamond Plateau") is a region of Bahia state, in the Northeast of Brazil. This same chain receives other names, like Serra do Espinhaço, in Minas Gerais, and Borborema, in Pernambuco and Paraíba. The Chapada Diamantina is at the center of Bahia state, in the Northeast of Brazil. It is the northern zone of the Espinhaço Range, has approximately and encompasses 58 municipalities. Technically it is considered part of the caatinga biome, and is the highest area in this